FMJ A32, P35 & P35/3 Ampli ers service manual... · 2016. 8. 27. · A32 FMJ A32, P35 & P35/3 Ampliﬁ ers Service Manual AARCAMRCAM Issue 1.0. Contents List Phono board L870 o Circuit

A32

FMJ A32, P35 & P35/3Amplifi ers

Service Manual

ARCAMARCAM

Issue 1.0

Contents List

! Phono board L870

o Circuit description o Component overlay o Parts list o Circuit diagrams

! Amplifier & PSU board L882


! Display board L928

o Component overlay o Parts list o Circuit diagrams

! Preamplifier board L937


! 3rd Channel Amplifier board L911 o Component overlay o Parts list o Circuit diagrams

! Transformer specifications o L914TX o L915TX

! General assembly

o A32 - Mechanical parts list o P35 - Mechanical parts list o P35/3 - Mechanical parts list

Phono Board L870

Contents

! Circuit description

! Component overlay

! Parts list

! Circuit diagrams

AV8 Phono Board Circuit Description Refer to circuit diagram L870 sheet 1 The phono board is a simple single stage RIAA amplifier and consists of two channels of high gain amplification, and the ability to switch between moving magnet (MM) and moving coil (MC) settings. PSU The unit derives its + 15V regulated rails from the unit it is fitted into with only local decoupling capacitors on board. Interface The unit connects to the host unit via a 8 way connector. Amplification The left channel has designators beginning with 100, and the right with 200. For the purposes of this description the left channel will be described, as the right channel is the same in all respects. The amplifier is a small signal class A voltage feedback amplifier with switch able gain. The input consists of an actively loaded differential pair of very low noise PNP transistors (TR106, TR107). These transistors are very specific and should only be replaced with identical parts with the E grade high gain. TR100 and TR101 form a current source for the pair, which sets the quiescent current for the entire amplifier. The active load consists of TR110 and TR111, which forms part of the differential current mirror with TR112, TR113 & TR114. This differential stage also has an active load (TR102 & TR103) to keep gain to a maximum. Both of these differential stages are designed to have as much gain as possible to enable the single stage design. The RIAA response is achieved in the feedback network: C101, C110, C111, C112, C119, C120 and R115, R112. C115 is used to correct between MM and MC gains as the amplifier is non-inverting. SW100 switches between MM and MC. Two poles of the switch change between the different loading required for each type of the cartridge: R108 & C109 for MM and added in parallel for MC R104 & C108. The other two poles change the feedback resister value to alter the gain: R105 for MM and added in parallel for MC R123. The DC offset is controlled by a non-inverting servo built around IC100. The amount of servo current is different for each gain setting via R111 (MM) and R124 (MC) so that the low frequency high pass point remains the same for both settings. However the high pass point for the circuit is set by C113. This gives a warp filter, stops DC start-up thumps from upsetting DC coupled circuitry and an approximation of the RIAA/IEC curve (-2dB @ 20Hz) The output is class A buffered by a dual mirror follower (TR104, TR105, TR108, TR109). The quiescent current is set by D100 and R118 and R119. Closed loop stability is achieved with C16, C117, giving symmetrical slewing capability.

L870 Phono Board Parts List Issue 2.0

Designator Part Description

C1 2A410 CERD 100N 63V -20% +80% RAC100 2N622 ELST 22U 63VC101 2D210 PPRO 1N0 5% 63V RAC102 2P710AS ELEC 100U 25V SILMICC103 2P710AS ELEC 100U 25V SILMICC104 2K410 PEST 100N 63V 10%C105 2K410 PEST 100N 63V 10%C106 2K410 PEST 100N 63V 10%C107 2K410 PEST 100N 63V 10%C108 2D147W PPRO W 470P 63V 5% RAC109 2D110W PPRO W 100P 63V 5% RAC110 2D247N PPRO 4N7 63V 5% RAC111 2D310 PPRO 10N 63V 1% AXIALC112 2D310 PPRO 10N 63V 1% AXIALC113 2K510 CAP MKS2 1U0 16V 10%C115 2D213N PPRO 1N3 63V 5% RAC116 2D147W PPRO W 470P 63V 5% RAC117 2D147W PPRO W 470P 63V 5% RAC118 2U610 ELST NON POLAR 10UF 35VC119 2D110N PPRO 100P 63V 5% RAC120 2D210 PPRO 1N0 5% 63V RAC200 2N622 ELST 22U 63VC201 2D210 PPRO 1N0 5% 63V RAC202 2P710AS ELEC 100U 25V SILMICC203 2P710AS ELEC 100U 25V SILMICC204 2K410 PEST 100N 63V 10%C205 2K410 PEST 100N 63V 10%C206 2K410 PEST 100N 63V 10%C207 2K410 PEST 100N 63V 10%C208 2D147W PPRO W 470P 63V 5% RAC209 2D110W PPRO W 100P 63V 5% RAC210 2D247N PPRO 4N7 63V 5% RAC211 2D310 PPRO 10N 63V 1% AXIALC212 2D310 PPRO 10N 63V 1% AXIALC213 2K510 CAP MKS2 1U0 16V 10%C215 2D213N PPRO 1N3 63V 5% RAC216 2D147W PPRO W 470P 63V 5% RAC217 2D147W PPRO W 470P 63V 5% RAC218 2U610 ELST NON POLAR 10UF 35VC219 2D110N PPRO 100P 63V 5% RAC220 2D210 PPRO 1N0 5% 63V RAD100 3A4148 SSDIODE 1N4148 75VD101 3A4148 SSDIODE 1N4148 75VD102 3A4148 SSDIODE 1N4148 75VD200 3A4148 SSDIODE 1N4148 75VD201 3A4148 SSDIODE 1N4148 75VD202 3A4148 SSDIODE 1N4148 75VIC100 5B071 IC FET OPAMP TL071IC200 5B071 IC FET OPAMP TL071PCB1 L870PB_2 PRINTED CIRCUIT BOARDR100 1H133 RES MF W4 1% 330RR101 1H110 RES MF W4 1% 100RR102 1H110 RES MF W4 1% 100RR104 1H110 RES MF W4 1% 100RR105 1H110 RES MF W4 1% 100RR106 1H110 RES MF W4 1% 100RR108 1H347 RES MF W4 1% 47KR109 1H312 RES MF W4 1% 12KR110 1H312 RES MF W4 1% 12KR111 1H356 RES MF W4 1% 56KR112 1H410 RES MF W4 1% 100KR113 1H410 RES MF W4 1% 100KR114 1H410 RES MF W4 1% 100KR115 1H315 RES MF W4 1% 15KR116 1H522 RES MF W4 1% 2M2

L870 Phono Board Parts List Issue 2.0

Designator Part Description

R117 1H522 RES MF W4 1% 2M2R118 1H022 RES MF W4 1% 22RR119 1H022 RES MF W4 1% 22RR120 1H022 RES MF W4 1% 22RR121 1H022 RES MF W4 1% 22RR122 1H339 RES MF W4 1% 39KR123 1H010 RES MF W4 1% 10RR124 1H256 RES MF W4 1% 5K6R200 1H133 RES MF W4 1% 330RR201 1H110 RES MF W4 1% 100RR202 1H110 RES MF W4 1% 100RR204 1H110 RES MF W4 1% 100RR205 1H110 RES MF W4 1% 100RR206 1H110 RES MF W4 1% 100RR208 1H347 RES MF W4 1% 47KR209 1H312 RES MF W4 1% 12KR210 1H312 RES MF W4 1% 12KR211 1H356 RES MF W4 1% 56KR212 1H410 RES MF W4 1% 100KR213 1H410 RES MF W4 1% 100KR214 1H410 RES MF W4 1% 100KR215 1H315 RES MF W4 1% 15KR216 1H522 RES MF W4 1% 2M2R217 1H522 RES MF W4 1% 2M2R218 1H022 RES MF W4 1% 22RR219 1H022 RES MF W4 1% 22RR220 1H022 RES MF W4 1% 22RR221 1H022 RES MF W4 1% 22RR222 1H339 RES MF W4 1% 39KR223 1H010 RES MF W4 1% 10RR224 1H256 RES MF W4 1% 5K6SK1 8D230 PHONO SKT 2-WAY HOR EMC GOLDSK2 8K2408 8-WAY AMP CT CONNSW100 A1013 SW PUSH 4PCOTR100 4A556 TRANS LF SS P BC556BTR101 4A556 TRANS LF SS P BC556BTR102 4A556 TRANS LF SS P BC556BTR103 4A556 TRANS LF SS P BC556BTR104 4A556 TRANS LF SS P BC556BTR105 4A556 TRANS LF SS P BC556BTR106 4A1085 TRANS LF SS P 2SA1085TR107 4A1085 TRANS LF SS P 2SA1085TR108 4A546 TRANS LF SS N BC546BTR109 4A546 TRANS LF SS N BC546BTR110 4A546 TRANS LF SS N BC546BTR111 4A546 TRANS LF SS N BC546BTR112 4A546 TRANS LF SS N BC546BTR113 4A546 TRANS LF SS N BC546BTR114 4A546 TRANS LF SS N BC546BTR200 4A556 TRANS LF SS P BC556BTR201 4A556 TRANS LF SS P BC556BTR202 4A556 TRANS LF SS P BC556BTR203 4A556 TRANS LF SS P BC556BTR204 4A556 TRANS LF SS P BC556BTR205 4A556 TRANS LF SS P BC556BTR206 4A1085 TRANS LF SS P 2SA1085TR207 4A1085 TRANS LF SS P 2SA1085TR208 4A546 TRANS LF SS N BC546BTR209 4A546 TRANS LF SS N BC546BTR210 4A546 TRANS LF SS N BC546BTR211 4A546 TRANS LF SS N BC546BTR212 4A546 TRANS LF SS N BC546BTR213 4A546 TRANS LF SS N BC546BTR214 4A546 TRANS LF SS N BC546B

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FilenameECO No. DESCRIPTION OF CHANGE

G:\DATA\ECO\ECO AGENDA\01_1070 l870 A85 PHONO ISSUE2\L870_2.0.ddb - L870c1_2.0.PRJ

A & R Cambridge Ltd.Pembroke AvenueDenny Industrial CentreWaterbeachCambridge CB5 9PB

A85 PHONO STAGE - TOP LEVEL

Circuit Diagram

L870C1JBR23-Apr-2001INITIALS

Date Printed 1 3Sheet of

Notes:

1

EMC

SK1PHONO2HG

0V_SIG

0V_SIG

LEFT IN LEFT OUT

LEFT CHANNELL870C2_2.0.SCH

RIGHT IN RIGHT OUT

RIGHT CHANNELL870C3_2.0.SCH

12345678

SK2

AMPCT8

+15V

-15V

0V_HF0V_SIG

Q_1

Q_2

Q_3

Q_4

Q_5

Q_6

Q_7 Q_8

PCB

PCB1

L870PB_2

Update Box

EL1

UPDATE_BOX

C1100N CD

00_1051 JAG 22/3/01 PRODUCTION ISSUE 1

01_1070 JAG 17/4/01 updated pcb and scm 2

1 2 3 4 5 6 7 8

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C

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A85 PHONO STAGE - LEFT CHANNEL

Circuit Diagram



Notes:

TR1062SA1085

TR1072SA1085

R12022R MF

R12122R MF

R105100R MF

R10847K MF

R101100R MF

R102100R MF

+ C102100U SILMIC

+C103100U SILMIC

R100330R MF

+ C10022U EL

R10912K MF

R11012K MF

C105100N PE

R117

2M2 MFR111

56K MF

R113100K MF

R114100K MF

TR111BC546B

TR110BC546B

TR114BC546B

TR112BC546B

TR113BC546B

TR100BC556B

TR101BC556B

TR102BC556B

TR103BC556B

TR104BC556B

TR105BC556B

TR108BC546B

TR109BC546B

+15V

-15V

R12239K MF

R112

100K MF

R115

15K MF

456

SW100B4PCO

10 11 12

SW100D4PCO

R104100R MF C108

470P PPW R12310R MF

C104100N PE

C107100N PE

R116

2M2 MF

3

26

74

IC100

TL071CD

0V_SIG0V_SIG

D1001N4148

R11822R MF

R11922R MF

C106100N PE

0V_SIG0V_HF

0V_SIG

0V_SIG0V_HF

D1011N4148

D1021N4148

R106100R MF

LEFT IN

LEFT OUT

Q_101

Q_102

Q_103

C109100P PPW

R1245K6 MF

C117470P PPWC116

470P PPW

C111

10N PP AX

C112

10N PP AX

C118

10U NP

C113

1U0 PE

C1151N3 PP

C110

4N7 PP

C101

1N0 PP

C119

100P PP


C120

1N0 PP


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A85 PHONO STAGE - RIGHT CHANNEL

Circuit Diagram



Notes:

TR2062SA1085

TR2072SA1085

R22022R MF

R22122R MF

R205100R MF

R20847K MF

R201100R MF

R202100R MF

+ C202100U SILMIC

+C203100U SILMIC

C209

100P PPW

R200330R MF

+ C20022U EL

R20912K MF

R21012K MF

C205100N PE

R217

2M2 MFR211

56K MF

R213100K MF

R214100K MF

TR211BC546B

TR210BC546B

TR214BC546B

TR212BC546B

TR213BC546B

TR200BC556B

TR201BC556B

TR202BC556B

TR203BC556B

TR204BC556B

TR205BC556B

TR208BC546B

TR209BC546B

+15V

-15V

R22239K MF

R212

100K MF

R215

15K MF

123

SW100A4PCO

7 8 9

SW100C4PCO

R204100R MF

C208

470P PPWR22310R MF

C204100N PE

C207100N PE

R216

2M2 MF

3

26

74

IC200

TL071CD

0V_SIG0V_SIG

D2001N4148

R21822R MF

R21922R MF

C206100N PE

0V_SIG0V_HF

0V_SIG

0V_SIG0V_HF

D2011N4148

D2021N4148

R206100R MF

RIGHT IN

RIGHT OUT

Q_201

Q_202

Q_203

R2245K6 MF

C217470P PPWC216

470P PPW

C215

1N3 PP

C211

10N PP AX

C212

10N PP AX

C21810U NP

C213

1U0 PE

C219

100P PP

C210

4N7 PP

C201

1N0 PP


C220

1N0 PP


Amplifier + PSU

Board L882

Contents


! Component overlay

! Parts list

! Circuit diagrams

Amplifier & PSU Circuit Description Refer to L882 circuit diagrams This is the printed circuit board that provides the power supply and output stage amplifiers for the A32 integrated and P35 power amplifiers. Its function is to: ! Drive the loudspeakers ! Provide an (always on) auxiliary 5VDC supply for the

micro controller and display interface ! Receive logic signals from the micro controller to turn

on the main amplifier supply relay (mains) and connect either pair of speaker output sockets

! Send logic signals to the micro controller pertaining to the state of the amplifiers (short circuit protection, DC offset protection, thermal protection)

! Receive and demodulate RC5 remote style control codes via the rear panel jack and transmit them to the micro controller

! Send a 12V trigger output via the rear panel jack for control of an auxiliary power amp when the unit is on

! Receive a 12V trigger input from the rear jack (for use in the power amp only version)

! Drive a pair of headphones via attenuating resistor networks The power amplifier is a symmetrical, class B, bipolar junction transistor output, current-feedback design (of which more later) with DC-coupled signal and feedback paths, featuring an active integrating voltage servo to control DC offsets.

It features ‘instantaneous’ safe operating area protection in addition to sending a signal to the micro to turn off the output relays in the event of user or thermal overload. Since it is a DC-coupled design, the unit senses DC at the output and triggers the micro to turn off the loudspeaker relays in the event of excessive levels (possibly due to a faulty source component or short circuit output transistor). The output stage uses Sanken specialised ‘audio amplifier’ power bipolar Darlington transistors which are optimised for use with this type of topology. Consequently the unit has excellent measured performance in terms of noise, slew rate, output impedance and distortion (harmonic and intermodulated) and is essentially load invariant (to a first order the measured performance is independent of the load impedance). L882 Circuit Sheet 1 The audio input to the amplifier is connected to SK102 (which connects to the output of the preamp PCB). This signal is passed on via SK104A which forms the preamp out connection to the outside world. SK104B provides the power amp input connection, with switchSW100 selecting between pre / power and integrated modes. The unit is wired as a preamp / power amp combination with the switch depressed, allowing the user to insert a processor or other function (e.g. graphic EQ) between the output of the preamp and the input of the power amp. With the switch in the ‘out’ position the power amp input socket is ignored and the input to the power amp is connected internally to the output of the preamp. PL100 and PL101 are ‘handbag’ links fitted to the power amp only version to connect both pairs of phono sockets in parallel for daisy chaining (as there is no preamp output on a power amp). Relays RLY100 and RLY101 switch the two pairs of loudspeaker output sockets and are controlled by the micro lines describes above. Transistors TR100 and TR101 operate in ‘constant current sink’ mode which allow relay current to be approximately constant although the main power supply

rails will vary with mains input and load conditions. The current is around 20mA per relay. Star point SP100 is the ground ‘mecca’ for the entire amplifier (comprising all three PCBs within the unit). All of the separately named grounds are joined explicitly at this point. Different named grounds are used to ensure that no two ‘different’ grounds share copper, which could compromise the noise, distortion or crosstalk performance of the amplifier. The loudspeaker output signals are passed to socket SK106 which connects to SK107 and onto the headphone output via the attenuation resistors R103 thru R106. The hierarchy containing the other sheets is self explanatory. Each of the port names shown on the top sheet connects to the port of the same name on the lower sheets. L882 Circuit Sheet 2 This sheet contains the power supplies, the rear panel jack socket trigger circuits, the standby relay control and the ‘interface’circuits between the output signals of the power amplifiers and the inputs expected by the micro processor. The mains input enters the unit at SK203, with capacitors C205 and C206 acting as conducted RF suppression. The earth connection is passed on to the chassis (for safety reasons the chassis metalwork remains connected to mains power earth at all times). Switch SW200 is the voltage selector switch, allowing the unit to be operated in 230V or 115V mains countries by switching the dual-primary mains transformers between series and parallel winding. Varistors VR200 and VR201 act to prevent over-voltage surges from damaging the unit. If the user selects 115V operation and then connects the unit to a 230V supply, the varistors will go to a low impedance and blow the primary fuses. Any very high voltage line transients will also be suppressed, helping to eliminate transformer isolation breakdown. Relay RLY200 switches the primary side of the mains transformer, allowing the micro to control the on / off status of the amplifier. Its contacts are snubbed by capacitors C207 and C208 (to eliminate switching spark transients and prolong relay lifespan). The primary windings of the toroidal mains transformer connect to SK204. PCB mounted transformer TX200 is powered all the time that mains is present on SK203, irrespective of the on / off status of the amplifier. This is to ensure that the micro processor is always operational and can thus control the mains switching for the main amplifier. Secondary fuse F202 limits the current in the event of a failure mode, as the short circuit primary current of TX200 would be insufficient to blow the mains fuses. Diodes D200 thru D203, C227 and IC201 provide the 5VDC supply which powers the micro and display PCB and the relay coils. C224 is to reduce diode noise being transmitted back through the leakage capacitance of TX200. The mains transformer secondary winding is connected to SK200. This is a centre tapped winding, and is used with full bridge rectifier BR200 to produce the main positive and negative supplies for the power amp. C209 and C210 are the large reservoir capacitors, with C211 and C212 acting as high frequency decouplers. The main power supply rails and ground are accessible on SK205 for future module expansion.

The circuitry around SK201A and IC200 is to receive and demodulate remote control commands sent in via the rear panel jack socket. This is for multi-room applications. L200 and C200 form a parallel resonant circuit at approximately 37kHz. The output from this bandpass filter is passed into IC200A where it is ‘chopped’ and fed to IC200B to provide the output signal. SK201B is a 13VDC signal trigger output which is active whenever the amplifier is powered up. R218 and DZ207 / C223 provide a reference voltage which is buffered by TR200. TR201 and R217 act as a current limit and prevent damage due to a short circuit on the output of SK201B. The maximum current is approximately 65mA. TR203 and TR202 are a complementary Darlington pair which turn on mains relay RLY200 when activated by a signal from the microprocessor. TR204 and its associated components are to detect whenever AC mains is present at the IEC socket. This is to notify the microprocessor if the user has unplugged the mains cord, so that it can take the necessary action (muting all the outputs and switching off the mains relay). The reservoir capacitors should last at least 4 mains cycles which gives the microprocessor plenty of time for a controlled shutdown. TR204 forms a monostable circuit. Each cycle of AC turns on TR204 via R211. TR204 then ‘shunts’ C229 ensuring that it is kept at a low potential. If more than one mains cycle is missing, then R219 charges up C229 sufficiently to trigger Schmitt inverter IC202E thus passing on a logic signal to the microprocessor. The use of a Schmitt inverter for IC202 is to ensure that the micro receives ‘clean’ logic levels - the hysteresis voltage (about 0.5V) is sufficient to prevent circuit noise from producing a string of ‘ghost’ signals when analogue levels are near the threshold point. TH200 is a positive tempco thermistor placed adjacent to the heatsink on which the output transistors are mounted. When the temperature of the thermistor exceeds 90 degrees Celsius the thermistor goes to a high impedance and so the input to IC202F goes low. This triggers a HIGH output to the micro indicating thermal overload. The VI protection signals from the left and right channels pass into IC202A and IC202B respectively, to be ‘cleaned up’ via the Schmitt trigger. They are then NOR’d using TR205 which sends a HIGH signal to the micro in the event of either channel suffering a short circuit or current overload. Exactly the same approach is used for the DC fault lines using IC202C and IC202D. L882 Circuit Sheet 3 This is the main audio power amplifier circuit. The amplifier is a class B design, which uses SAP ‘audio’ transistors in a symmetrical current feedback configuration. Input and feedback paths are DC coupled and there is an active integrating servo to remove DC offsets from the output. The basic principle of operation is follows: The input signal is amplified by a factor of 2 in IC300A. This drives a 44˜ impedance to ground causing the supply pin currents to change with the signal level. These changing supply pin currents are then ‘reflected’ by a pair of complementary Wilson mirrors and passed on to a series of buffer transistors before being connected to the load. The ‘feedback current’ flows back from the output terminal via R331 and R332 and attempts to provide the current necessary to allow IC300A to swing its output without drawing excessive current from its supply pins, thus making the change in supply current very small indeed. This is why the term ‘current feedback’ is used - it is the current flowing in

the feedback resistors that sets the overall gain of the amplifier. IC300B acts as an inverting integrator and its purpose is to remove DC from the loudspeaker output. Any positive DC offset will cause the output of IC300B to go negative, thus increasing the current in its negative supply pin and pulling the output voltage back towards zero. R330 and C317 set the time constant of this integrator (0.47 seconds) so that audio frequency components are ignored and only DC and subsonic frequencies are removed. The input to the amplifier is limited to ±5.4V via back-to-back zener diodes DZ302 and DZ303. This is to prevent the user from grossly overdriving the input to the amplifier and possibly causing damage. The diodes appear before series resistor R324 so that their variable capacitance does not introduce high frequency harmonic distortion. R324, R327 and C316 act as an input filter - this is a first order low pass filter with a corner frequency of around 340kHz to prevent RF signals from being injected into the front end of the amplifier. The corner frequency was chosen such that the phase shift introduced is less than 5˜ at 20kHz (considered by the AES to be the minimum perceptible relative amount by the human ear). The input impedance of the amplifier is 23kW at DC, falling to around 14kW at 20kHz. Operational amplifier IC300A is acting as a non-inverting gain of 2, driving the input signal into a 44W impedance to ground via R322 and R337. Its output voltage will be an accurate amplification of its input voltage (i.e. the signal on pin 1 should look identical to that on pin 3 but at twice the amplitude). The op-amp is used in a slightly unusual configuration here, in that its power supply pins are used as a (current) output, and its output pin is used as a (current) feedback. Transistors TR311 and TR303 supply the ±15V rails to the op-amp, and act as cascades to pass its supply pin currents through to the current mirrors, which sit at a potential too high for the op-amp to be connected directly. TR300, TR301 and TR321 form a PNP Wilson current mirror, which reflects the current sunk by the positive supply pin of IC300. Likewise TR314, TR315 and TR320 form an NPN Wilson current mirror, which reflects the current sourced by the negative supply pin of IC300. R315 thru R318 provide emitter degeneration of approximately 300mV for the current mirrors (as they pass about 3mA DC in quiescent conditions), to ensure accurate operation independent of the small variations between the transistors in the current mirrors. They also ensure that the current passing down the next stage is reasonably constant as the internal temperature of the amplifier changes, swamping out small thermal variations in the VBE of the mirror transistors. R319 and R320 slightly decouple the rails to the current mirrors from the main power rails of the amplifier, to allow the bootstrap circuit to operate. The bootstrap consists of C302 and C306 with metal film power resistors R352 and R353. The bootstrap is provided to allow the power supply rails of the current mirrors to go up and down slightly with the output signal into the loudspeaker. This enables the driver stage to fully saturate the output transistors and thus give the greatest power output and best thermal efficiency for any given power rail voltage. The voltage on the ‘inside’ end of R319 and R320 will vary by about 12 volts peak to peak at full output power, rising above the main power rails during signal peaks.

C307 and C308 with R333 and R335 provide the compensation necessary to ensure stability when the loop is closed. They are Miller capacitors which dramatically reduce the transimpedance (i.e. current to voltage gain) of the current mirrors at high frequencies. The present value of 47pF provides for a unity gain open loop bandwidth of around 75MHz, whilst ensuring a closed loop gain margin of around 6dB (note that gain margin in a current feedback design is not dependent on system bandwidth to a first order approximation). R333 and R335 provide a ‘zero’ in the open loop frequency response which is tailored to give the best time domain performance (i.e. to make high frequency square waves look square with minimal ringing or overshoot). DZ304 and C311 provide a fixed 4.7V bias voltage to allow the following stages to operate correctly. C311 is there to ensure that both halves of the following stage receive an equal AC signal component at high frequency. TR310 and TR307 are the ‘pre-driver’ transistors, which act to buffer the outputs from the preceding stage and drive the Darlington output power transistors. TR309 and R321 act as a current limit, to ensure that the emitter current of TR310 does not exceed 30mA in a fault condition. TR306 and R323 provide the same function for TR307. R338 and R339 are to loosely couple the outputs of the pre-driver stage to the inputs of the Darlington power output devices. This is so that the inbuilt temperature sensing diodes of the output transistors can accurately control the quiescent current of the output stage as the junction temperature of the power devices varies. C312 and C318 ensure that both halves of the output stage receive an equal AC signal component. The output transistors are TR318 and TR319. These are Sanken SAP15N and SAP15P devices respectively. They are specially designed for audio power amplifier use. In addition to high current gain (Darlington with a typical hFE of 20,000) they provide an inbuilt emitter resistor (thick film power resistor of 0W22) and temperature sensing diodes which closely and rapidly track the VBE versus temperature characteristic of the power transistors, allowing for easy, fast-responding and reasonably accurate control of quiescent current. RV300 is for fine trimming of the quiescent current. PL300 provides a convenient measuring point for this, which is short-circuit protected in the event of a slip with the multimeter probe! All of the remaining circuitry to the right of TR318 and TR319 is essentially for output stage protection... Transistors TR312 and TR304, along with the network of resistors and capacitors to which they are connected, provide instantaneous overload protection of the output stage. This is a conventional single slope VI protection scheme, which allows much greater current to be delivered into a rated load than into a short circuit. The values allow for 18A peak delivery (at clip) into a purely resistive load, 7A peak (at clip) into a purely capacitive load and around 4A peak into a short circuit. R345, C303, R346 and C304 allow these values to be doubled for short transient bursts (approximately 2.7 milliseconds) so that impulsive musical transients can be delivered cleanly with minimal risk of damaging the output transistors. TR313, TR302 and their associated components send a signal to the microprocessor when the instantaneous protection circuits are having to work ‘hard’ to prevent amplifier overload. This instructs the micro that the user is severely abusing the amplifier and will switch off the loudspeaker relays to prevent possible permanent damage. In reality, if you short circuit the outputs at any appreciable volume level, this circuit will trigger and the microprocessor will turn off the loudspeaker relays and send a signal to the user.

R308, R314 and C320 form a low pass filter from which the DC detection circuits can sense excessive DC at the loudspeaker outputs. If there is any positive DC present, then TR316 will turn on, which turns on TR305 and thus activates the DC protection line to the micro, turning off the loudspeaker relays. If there is any negative DC present, then TR308 will turn on, which turns on TR317 which then turns on TR305 in turn, causing the same effect. R350 and C319 are the Zobel network which is provided to ensure the amplifier ‘sees’ a constant and resistive load at very high frequencies, to aid stability, although the amplifier will be stable without the Zobel fitted. C313 locally couples the ‘high frequency’ and loudspeaker ground returns together at the output to overcome the effects of track inductance back to the star point. C309 couples the ‘high frequency’ and signal grounds together at the input for the same reason. D303 and D304 are ‘flyback’ diodes to protect the output transistors from reverse bias when the amplifier is heavily clipped into an inductive load (such as a loudspeaker voice coil!) Sheet 4 is an identical copy of sheet 3 so I will not describe it separately.

L882 Amplifier and PSU Board Parts List Issue 3.0

Designator Part DescriptionBR200 3BGBU8D BRIDGE RECTIFIER 8A 200VC100 2C210 MLC 1N0 50V X7R 10% SMC200 2D168 PPRO 680P 5% 63V RAC201 2C410 MLC 100N 50V X7R 10% SMC202 2C410 MLC 100N 50V X7R 10% SMC203 2C410 MLC 100N 50V X7R 10% SMC204 2C410 MLC 100N 50V X7R 10% SMC205 2K233 SUPPR CAP 3N3 250VC206 2K233 SUPPR CAP 3N3 250VC207 2K233 SUPPR CAP 3N3 250VC208 2K233 SUPPR CAP 3N3 250VC209 2N910A ELST 10m 63V RA 35mmC210 2N910A ELST 10m 63V RA 35mmC211 2H410 PCRB 100N 100V 10% RA 5mmC212 2H410 PCRB 100N 100V 10% RA 5mmC213 2C310 MLC 10N 50V X7R 10% SMC214 2C310 MLC 10N 50V X7R 10% SMC215 2C310 MLC 10N 50V X7R 10% SMC216 2C310 MLC 10N 50V X7R 10% SMC217 2C310 MLC 10N 50V X7R 10% SMC218 2C310 MLC 10N 50V X7R 10% SMC219 2C310 MLC 10N 50V X7R 10% SMC220 2C410 MLC 100N 50V X7R 10% SMC221 2C310 MLC 10N 50V X7R 10% SMC222 2N610 ELST 10U 50VC223 2N610 ELST 10U 50VC224 2A410 CERD 100N 63V 20% RAC225 2A410 CERD 100N 63V 20% RAC226 2A410 CERD 100N 63V 20% RAC227 2N833 ELST 3M3 25VC228 2N810A ELST 1M0 10VC229 2N622 ELST 22U 63VC230 2C310 MLC 10N 50V X7R 10% SMC231 2C210 MLC 1N0 50V X7R 10% SMC232 2C410 MLC 100N 50V X7R 10% SMC233 2N610 ELST 10U 50VC234 2D422 220NF CLASS X2 CAP 275VRMSC235 2C210 MLC 1N0 50V X7R 10% SMC300 2N710 ELST 100U 25VC301 2N710 ELST 100U 25VC302 2N710B ELST 100U 100VC303 2N710 ELST 100U 25VC304 2N710 ELST 100U 25VC305 2N610 ELST 10U 50VC306 2N710B ELST 100U 100VC307 2C110 MLC 100P 50V NPO 5% SMC308 2C110 MLC 100P 50V NPO 5% SMC309 2C410 MLC 100N 50V X7R 10% SMC310 2C410 MLC 100N 50V X7R 10% SMC311 2H410 PCRB 100N 100V 10% RA 5mmC312 2C310 MLC 10N 50V X7R 10% SMC313 2C410 MLC 100N 50V X7R 10% SMC314 2C410 MLC 100N 50V X7R 10% SMC315 2C410 MLC 100N 50V X7R 10% SMC316 2D147W PPRO W 470P 63V 5% RAC317 2K447 PEST 470N 63V 10%C318 2N610 ELST 10U 50VC319 2K410 PEST 100N 63V 10%C320 2V710 ELST NON POLAR 100UF 16VC400 2N710 ELST 100U 25VC401 2N710 ELST 100U 25VC402 2N710B ELST 100U 100V


Designator Part DescriptionC403 2N710 ELST 100U 25VC404 2N710 ELST 100U 25VC405 2N610 ELST 10U 50VC406 2N710B ELST 100U 100VC407 2C110 MLC 100P 50V NPO 5% SMC408 2C110 MLC 100P 50V NPO 5% SMC409 2C410 MLC 100N 50V X7R 10% SMC410 2C410 MLC 100N 50V X7R 10% SMC411 2H410 PCRB 100N 100V 10% RA 5mmC412 2C310 MLC 10N 50V X7R 10% SMC413 2C410 MLC 100N 50V X7R 10% SMC414 2C410 MLC 100N 50V X7R 10% SMC415 2C410 MLC 100N 50V X7R 10% SMC416 2D147W PPRO W 470P 63V 5% RAC417 2K447 PEST 470N 63V 10%C418 2N610 ELST 10U 50VC419 2K410 PEST 100N 63V 10%C420 2V710 ELST NON POLAR 100UF 16VD100 3B4003 RECTIFIER 1N4003F 1A 200VD101 3B4003 RECTIFIER 1N4003F 1A 200VD200 3B4003 RECTIFIER 1N4003F 1A 200VD201 3B4003 RECTIFIER 1N4003F 1A 200VD202 3B4003 RECTIFIER 1N4003F 1A 200VD203 3B4003 RECTIFIER 1N4003F 1A 200VD205 3AS16W DIODE SS SM BAS16WD206 3AS16W DIODE SS SM BAS16WD300 3AS16W DIODE SS SM BAS16WD301 3AS16W DIODE SS SM BAS16WD302 3AS16W DIODE SS SM BAS16WD303 3B4003 RECTIFIER 1N4003F 1A 200VD304 3B4003 RECTIFIER 1N4003F 1A 200VD400 3AS16W DIODE SS SM BAS16WD401 3AS16W DIODE SS SM BAS16WD402 3AS16W DIODE SS SM BAS16WD403 3B4003 RECTIFIER 1N4003F 1A 200VD404 3B4003 RECTIFIER 1N4003F 1A 200VDZ204 3CW34V7 ZENER 4V7 OW 35 SM SOT23DZ207 3CW315V ZENER 15V OW35 SM SOT23DZ300 3CW315V ZENER 15V OW35 SM SOT23DZ301 3CW315V ZENER 15V OW35 SM SOT23DZ302 3CW34V7 ZENER 4V7 OW 35 SM SOT23DZ303 3CW34V7 ZENER 4V7 OW 35 SM SOT23DZ305 3CW34V7 ZENER 4V7 OW 35 SM SOT23DZ306 3CW34V7 ZENER 4V7 OW 35 SM SOT23DZ400 3CW315V ZENER 15V OW35 SM SOT23DZ401 3CW315V ZENER 15V OW35 SM SOT23DZ402 3CW34V7 ZENER 4V7 OW 35 SM SOT23DZ403 3CW34V7 ZENER 4V7 OW 35 SM SOT23DZ405 3CW34V7 ZENER 4V7 OW 35 SM SOT23DZ406 3CW34V7 ZENER 4V7 OW 35 SM SOT23EL 8M101 EARTH LEADF200 C12207 FUSE 20mm 2A ASF200 F022 INS COVER PCB FUSEHOLDERF200 8S004 FUSEHOLDER 20mm PCBF201 F022 INS COVER PCB FUSEHOLDERF201 8S004 FUSEHOLDER 20mm PCBF201 C12207 FUSE 20mm 2A ASF202 C3501 FUSE R452 T500mAHS200 F008 HEATSINK TO220 8.6 DEGC/WHS200 F006 HEATSINK CLIP TO220 13/8.6 DC/WIC200 5M393AD IC COMPARATOR SM DUAL LM393AIC201 5D7805 IC VREG POS 7805


Designator Part DescriptionIC202 5J7414D SURFACE MOUNT HEX SCHMITT TRIGGERIC300 5B072D IC AUDIO SM DUAL TL072IC400 5B072D IC AUDIO SM DUAL TL072L200 7D327 27mH INDUCTORL300 7D002C INDUCT 2U2 12x20mmL400 7D002C INDUCT 2U2 12x20mmPCB L882PB_3 PRINTED CIRCUIT BOARDPL100 8K6201 2WAY MOLEX VERT MALE CONNECTORPL101 8K6201 2WAY MOLEX VERT MALE CONNECTORPL300 8K6201 2WAY MOLEX VERT MALE CONNECTORPL400 8K6201 2WAY MOLEX VERT MALE CONNECTORR100 1H010 RES MF W4 1% 10RR101 1A110 RES SM W4 1% 100R 1206R102 1A110 RES SM W4 1% 100R 1206R103 1.00E+133 RES CF 1W 330R 5%R104 1.00E+133 RES CF 1W 330R 5%R105 1.00E+110 RES CF 1W 100R 5%R106 1.00E+110 RES CF 1W 100R 5%R107 1A122 RES SM W4 1% 220R 1206R108 1A122 RES SM W4 1% 220R 1206R200 1A210 RES SM W4 1% 1K0 1206R201 1A210 RES SM W4 1% 1K0 1206R202 1A210 RES SM W4 1% 1K0 1206R203 1A210 RES SM W4 1% 1K0 1206R204 1A210 RES SM W4 1% 1K0 1206R205 1A210 RES SM W4 1% 1K0 1206R206 1A210 RES SM W4 1% 1K0 1206R207 1A210 RES SM W4 1% 1K0 1206R208 1A310 RES SM W4 1% 10K 1206R209 1A310 RES SM W4 1% 10K 1206R210 1A310 RES SM W4 1% 10K 1206R211 1A310 RES SM W4 1% 10K 1206R212 1A247 RES SM W4 1% 4K7 1206R213 1A247 RES SM W4 1% 4K7 1206R214 1A247 RES SM W4 1% 4K7 1206R215 1A247 RES SM W4 1% 4K7 1206R216 1A247 RES SM W4 1% 4K7 1206R217 1A010 RES SM W4 1% 10R 1206R218 1A310 RES SM W4 1% 10K 1206R219 1A218 RES SM W4 1% 1K8 1206R220 1A010 RES SM W4 1% 10R 1206R221 1A010 RES SM W4 1% 10R 1206R222 1A310 RES SM W4 1% 10K 1206R223 1A310 RES SM W4 1% 10K 1206R224 1A218 RES SM W4 1% 1K8 1206R225 1A218 RES SM W4 1% 1K8 1206R226 1A147 RES SM W4 1% 470R 1206R227 1A210 RES SM W4 1% 1K0 1206R228 1A410 RES SM W4 1% 100K 1206R229 1A410 RES SM W4 1% 100K 1206R230 1A215 RES SM W4 1% 1K5 1206R231 1K515 RES W25 5% VR25 1M5R300 1A310 RES SM W4 1% 10K 1206R301 1A310 RES SM W4 1% 10K 1206R302 1A310 RES SM W4 1% 10K 1206R303 1A310 RES SM W4 1% 10K 1206R304 1A310 RES SM W4 1% 10K 1206R305 1A310 RES SM W4 1% 10K 1206R306 1A310 RES SM W4 1% 10K 1206R307 1A310 RES SM W4 1% 10K 1206R308 1A310 RES SM W4 1% 10K 1206R309 1A310 RES SM W4 1% 10K 1206


Designator Part DescriptionR310 1A247 RES SM W4 1% 4K7 1206R311 1A310 RES SM W4 1% 10K 1206R312 1A310 RES SM W4 1% 10K 1206R313 1A310 RES SM W4 1% 10K 1206R314 1A247 RES SM W4 1% 4K7 1206R315 1A110 RES SM W4 1% 100R 1206R316 1A110 RES SM W4 1% 100R 1206R317 1A110 RES SM W4 1% 100R 1206R318 1A110 RES SM W4 1% 100R 1206R319 1A110 RES SM W4 1% 100R 1206R320 1A110 RES SM W4 1% 100R 1206R321 1A022 RES SM W4 1% 22R 1206R322 1A022 RES SM W4 1% 22R 1206R323 1A022 RES SM W4 1% 22R 1206R324 1A210 RES SM W4 1% 1K0 1206R325 1A210 RES SM W4 1% 1K0 1206R326 1A210 RES SM W4 1% 1K0 1206R327 1A322 RES SM W4 1% 22K 1206R328 1A247 RES SM W4 1% 4K7 1206R329 1A247 RES SM W4 1% 4K7 1206R330 1A510 RES SM W4 1% 1M0 1206R331 1A215 RES SM W4 1% 1K5 1206R332 1A218 RES SM W4 1% 1K8 1206R333 1A233 RES SM W4 1% 3K3 1206R334 1A322 RES SM W4 1% 22K 1206R335 1A233 RES SM W4 1% 3K3 1206R336 1A322 RES SM W4 1% 22K 1206R337 1A022 RES SM W4 1% 22R 1206R338 1A115 RES SM W4 1% 150R 1206R339 1A115 RES SM W4 1% 150R 1206R340 1A410 RES SM W4 1% 100K 1206R341 1A133 RES SM W4 1% 330R 1206R342 1A133 RES SM W4 1% 330R 1206R343 1A110 RES SM W4 1% 100R 1206R344 1A110 RES SM W4 1% 100R 1206R345 1A000 RES SM W4 1% 0R0 1206R346 1A000 RES SM W4 1% 0R0 1206R347 1A110 RES SM W4 1% 100R 1206R348 1A110 RES SM W4 1% 100R 1206R349 1A110 RES SM W4 1% 100R 1206R350 1C856 RES CF 2W 5R6 5%R351 1H010 RES MF W4 1% 10RR352 1J147 RES 2W MF 5% 470RR353 1J147 RES 2W MF 5% 470RR354 1A210 RES SM W4 1% 1K0 1206R355 1A268 RES SM W4 1% 6K8 1206R400 1A310 RES SM W4 1% 10K 1206R401 1A310 RES SM W4 1% 10K 1206R402 1A310 RES SM W4 1% 10K 1206R403 1A310 RES SM W4 1% 10K 1206R404 1A310 RES SM W4 1% 10K 1206R405 1A310 RES SM W4 1% 10K 1206R406 1A310 RES SM W4 1% 10K 1206R407 1A310 RES SM W4 1% 10K 1206R408 1A310 RES SM W4 1% 10K 1206R409 1A310 RES SM W4 1% 10K 1206R410 1A247 RES SM W4 1% 4K7 1206R411 1A310 RES SM W4 1% 10K 1206R412 1A310 RES SM W4 1% 10K 1206R413 1A310 RES SM W4 1% 10K 1206R414 1A247 RES SM W4 1% 4K7 1206R415 1A110 RES SM W4 1% 100R 1206


Designator Part DescriptionR416 1A110 RES SM W4 1% 100R 1206R417 1A110 RES SM W4 1% 100R 1206R418 1A110 RES SM W4 1% 100R 1206R419 1A110 RES SM W4 1% 100R 1206R420 1A110 RES SM W4 1% 100R 1206R421 1A022 RES SM W4 1% 22R 1206R422 1A022 RES SM W4 1% 22R 1206R423 1A022 RES SM W4 1% 22R 1206R424 1A210 RES SM W4 1% 1K0 1206R425 1A210 RES SM W4 1% 1K0 1206R426 1A210 RES SM W4 1% 1K0 1206R427 1A322 RES SM W4 1% 22K 1206R428 1A247 RES SM W4 1% 4K7 1206R429 1A247 RES SM W4 1% 4K7 1206R430 1A510 RES SM W4 1% 1M0 1206R431 1A215 RES SM W4 1% 1K5 1206R432 1A218 RES SM W4 1% 1K8 1206R433 1A233 RES SM W4 1% 3K3 1206R434 1A322 RES SM W4 1% 22K 1206R435 1A233 RES SM W4 1% 3K3 1206R436 1A322 RES SM W4 1% 22K 1206R437 1A022 RES SM W4 1% 22R 1206R438 1A115 RES SM W4 1% 150R 1206R439 1A115 RES SM W4 1% 150R 1206R440 1A410 RES SM W4 1% 100K 1206R441 1A133 RES SM W4 1% 330R 1206R442 1A133 RES SM W4 1% 330R 1206R443 1A110 RES SM W4 1% 100R 1206R444 1A110 RES SM W4 1% 100R 1206R445 1A000 RES SM W4 1% 0R0 1206R446 1A000 RES SM W4 1% 0R0 1206R447 1A110 RES SM W4 1% 100R 1206R448 1A110 RES SM W4 1% 100R 1206R449 1A110 RES SM W4 1% 100R 1206R450 1C856 RES CF 2W 5R6 5%R451 1H010 RES MF W4 1% 10RR452 1J147 RES 2W MF 5% 470RR453 1J147 RES 2W MF 5% 470RR454 1A210 RES SM W4 1% 1K0 1206R455 1A268 RES SM W4 1% 6K8 1206RLY100 A207 RELAY G5Z-2A-E 24VRLY101 A207 RELAY G5Z-2A-E 24VRLY200 A219 RELAY MAINS DPDT 5V 5ARV300 6F110 PRES 100R LIN HORIZRV400 6F110 PRES 100R LIN HORIZSH200 E5402 MAINS EMC SHIELDSK100 8D418G CAMCON BINDING POST 4WAY GOLDSK101 8D418G CAMCON BINDING POST 4WAY GOLDSK102 8K2404 4-WAY AMP CT CONNSK103 8K7014 FFC 14W 2.54MM VER PTHSK104 8D225 PHONO SKT 4-WAY EMC GOLDSK105 8D301 STEREO JACK PCBSK106 8K2404 4-WAY AMP CT CONNSK107 8K2404 4-WAY AMP CT CONNSK200 8K2306 MOLEX MINI FIT HCS 6 WAYSK201 8D302 MIN JACK DUAL 3.5mm HSJ1002-01-1020SK202 8Q003 CAGE CLAMP 16A 1 WAY ARC003-236SK203 8A001 IEC MAINS CONN PCB INS PXSK204 8K2308 MOLEX MINI FIT HCS 8 WAYSK205 8K2406 6-WAY AMP CT CONNSW100 A1008 SW PUSH 2PCOSW200 A1404 VOLTAGE SELECTOR SLIDE SWITCH


Designator Part DescriptionTH200 1T002 THERMISTOR SIEMENS B59008TR100 4B179 NPN TRANS MP BD179TR101 4B179 NPN TRANS MP BD179TR200 4B179 NPN TRANS MP BD179TR201 4AFMMT497 TRANS LF SS N SM FMMT497TR202 4AFMMT597 TRANS LF SS P SM FMMT597TR203 4AFMMT497 TRANS LF SS N SM FMMT497TR204 4A849B TRANS LF SS N SM BC849BTR205 4A856B TRANS LF SS P SM BC856BTR206 4A856B TRANS LF SS P SM BC856BTR300 4AFMMT597 TRANS LF SS P SM FMMT597TR301 4AFMMT597 TRANS LF SS P SM FMMT597TR302 4AFMMT597 TRANS LF SS P SM FMMT597TR303 4AFMMT597 TRANS LF SS P SM FMMT597TR304 4AFMMT597 TRANS LF SS P SM FMMT597TR305 4AFMMT597 TRANS LF SS P SM FMMT597TR306 4AFMMT597 TRANS LF SS P SM FMMT597TR307 4AFMMT597 TRANS LF SS P SM FMMT597TR308 4AFMMT597 TRANS LF SS P SM FMMT597TR309 4AFMMT497 TRANS LF SS N SM FMMT497TR310 4AFMMT497 TRANS LF SS N SM FMMT497TR311 4AFMMT497 TRANS LF SS N SM FMMT497TR312 4AFMMT497 TRANS LF SS N SM FMMT497TR313 4AFMMT497 TRANS LF SS N SM FMMT497TR314 4AFMMT497 TRANS LF SS N SM FMMT497TR315 4AFMMT497 TRANS LF SS N SM FMMT497TR316 4AFMMT497 TRANS LF SS N SM FMMT497TR317 4AFMMT497 TRANS LF SS N SM FMMT497TR318 4CSAP15N TRANS POWER NPN SAP15NTR319 4CSAP15P TRANS POWER PNP SAP15PTR320 4AFMMT497 TRANS LF SS N SM FMMT497TR321 4AFMMT597 TRANS LF SS P SM FMMT597TR322 4AFMMT497 TRANS LF SS N SM FMMT497TR400 4AFMMT597 TRANS LF SS P SM FMMT597TR401 4AFMMT597 TRANS LF SS P SM FMMT597TR402 4AFMMT597 TRANS LF SS P SM FMMT597TR403 4AFMMT597 TRANS LF SS P SM FMMT597TR404 4AFMMT597 TRANS LF SS P SM FMMT597TR405 4AFMMT597 TRANS LF SS P SM FMMT597TR406 4AFMMT597 TRANS LF SS P SM FMMT597TR407 4AFMMT597 TRANS LF SS P SM FMMT597TR408 4AFMMT597 TRANS LF SS P SM FMMT597TR409 4AFMMT497 TRANS LF SS N SM FMMT497TR410 4AFMMT497 TRANS LF SS N SM FMMT497TR411 4AFMMT497 TRANS LF SS N SM FMMT497TR412 4AFMMT497 TRANS LF SS N SM FMMT497TR413 4AFMMT497 TRANS LF SS N SM FMMT497TR414 4AFMMT497 TRANS LF SS N SM FMMT497TR415 4AFMMT497 TRANS LF SS N SM FMMT497TR416 4AFMMT497 TRANS LF SS N SM FMMT497TR417 4AFMMT497 TRANS LF SS N SM FMMT497TR418 4CSAP15N TRANS POWER NPN SAP15NTR419 4CSAP15P TRANS POWER PNP SAP15PTR420 4AFMMT497 TRANS LF SS N SM FMMT497TR421 4AFMMT597 TRANS LF SS P SM FMMT597TR422 4AFMMT497 TRANS LF SS N SM FMMT497TX200 7A9301 TRANSFORMER 3VA 9V+9V TYPE 9301

1 2 3 4 5 6 7 8

A

B

C

D

87654321

D

C

B

A

ISSUE

DRAWING NO.

23425

DRAWING TITLE

Drawn by:DATE


L882C1_4.1.PRJ


A85 amplifier and PSU - top sheet

Circuit Diagram

L882C1J Reckless20-Mar-2002INITIALS


Notes:

Top+

Top-

SK100A

CAMCON_G

Bot+

Bot-

SK100B

CAMCON_G

Top+

Top-

SK101A

CAMCON_G

Bot+

Bot-

SK101B

CAMCON_G

D1001N4003F

D1011N4003F

1 2

34

5 6

78SP100

STAR_8

EMC

1

N

FSK104A

PHONO4G

N

F

SK104B

PHONO4G

0V_SIG0V_SIG

0V_SIG

1 2 3

SW100A2PCO

4 5 6

SW100B2PCO

C1001N0 SM

1234

SK102

AMPCT4

STANDBYSPKR1 ONSPKR2 ONTHERMPROTVIPROTDCPROTAC PRESENT

L SIG

R SIG

SPKR1 ON

SPKR2 ON

THERMPROTVIPROTAC PRESENTDCPROT

LS L

LS R

L SIG0V_SIG0V_LS_L0V_HF_L+49V-49V +5V_D

+49V-49V

0V_D0V_PSU

R SIG0V_SIG0V_LS_R0V_HF_R+49V-49V

0V_TRIG

LS L

0V_LS_L

0V_LS_R

LS R

+49V

0V_D

VIPROT_LDCPROT_L

DCPROT_LVIPROT_RDCPROT_R

DCPROT_R

VIPROT_LVIPROT_R

STANDBY

+49V

+5V_D

0V_D

0V_PSU

0V_LS_R

0V_HF_R

0V_LS_L0V_HF_L

0V_D

0V_TRIG

0V_SIG

R103

330R 1W CFR104

330R 1W CF

R105100R 1W CF

R106100R 1W CF

1234

SK106

AMPCT4

231

45

67

SK105

HPSKT

1234

SK107

AMPCT4

LS L

LS R

0V_LS_L

REMOTE

REMOTE

FROM PREAMP

INTEGRATED / PRE-POWERMODE SELECT SWITCH

TRIGGER

TRIGGER

TP102

TP101

TP100

TP103TP104

TP105TP106

TP107TP108

TP109TP110

TP117

TP111 TP113 TP115

TP112 TP114 TP116

0V_D +5V(D)VPOSVNEG

0V_PSUPWRON

THPROT_uCVIPROT_LVIPROT_R VIPROT_uC

AC_PRES0V_TRIGDCPROT_LDCPROT_R

DCPROT_uCRC5 INTRG IN

L882C2L882C2_4.1.SCH

INPUT0V_SIG

VIPROTDCPROTOUTPUT0V_LS

0V_HFVPOSVNEG

L882C3L882C3_4.1.SCH

INPUT0V_SIG

VIPROTDCPROTOUTPUT0V_LS

0V_HFVPOSVNEG

L882C4L882C4_4.1.SCH

RLY100A

RLY G5Z-2A-E

RLY100B

RLY G5Z-2A-E

RLY100CRLY G5Z-2A-E

RLY101A

RLY G5Z-2A-E

RLY101B

RLY G5Z-2A-E

RLY101CRLY G5Z-2A-E

TR100BD179

TR101BD179

R101

100R SM

R102

100R SM

R107220R SM

R108220R SM

PCB

PCB

L882PB_4

TP118

TP119

TP120

TP121

1234567891011121314

SK103

FFC 14W 2.54MM VER8K7014

EARTH LEAD8M101

EL

EARTH LEAD

12

PL100

12

PL101

R100

10R MF

02_E035 JBR 4/2/2002 FUSE VALUES UPRATED TO T4A 4.0

02_E062 JBR 20/3/02 LDO REG FITTED TO IC201 4.1

1 2 3 4 5 6 7 8

A

B

C

D

87654321

D

C

B

A

ISSUE

DRAWING NO.

23425

DRAWING TITLE

Drawn by:DATE


L882C2_4.1.SCH


A85 amplifier - power supply and microcontroller interface

Circuit Diagram

L882C2J Reckless20-Mar-2002

INITIALSDate Printed 2 4Sheet of

Notes:

LN E

N E L

SK203IEC3 NO RIVETS

BC200TOOLING4.1

Gre

en1

SK202CAGECLAMP1

C2053N3 MAINS

C2063N3 MAINS

Far from PCB

SK201B

JACK3.5X2

Near to PCB

SK201A

JACK3.5X2

SW200BVOL SEL SLIDE

SW200AVOL SEL SLIDE

C208

3N3 MAINS

C207

3N3 MAINS

VinI

GN

DG

Vout O

IC201L4940V5

D2031N4003F

D2011N4003F

D2021N4003F

D2001N4003F

C225100N CD

C226100N CD

VR201VDR 115V

VR200VDR 115V

+1

~ 2

-4

~3

BR200BRGBU8D

LIVENEUTRAL

EARTH

EMC Shield

SH200EMCMAINS

NEUTRAL

LIVE

LIVE

NEUTRAL

0V_D

+5V(D)

0V_D

0V_PSU

VPOS

VNEG

0V_PSU

+49V

+5V_D

0V_D

PWRON

-49V

+5V_D

TH200PTH90DEG

+5V_D

0V_D

THPROT_uC

VIPROT_L

VIPROT_R

+5V_D

0V_D

VIPROT_uC

0V_D

9VRMS

+5V_D

0V_D

9VRMS

+ C22922U EL

AC_PRES

+

C2273300u 25V

+ C2281000u 10V

2

3

4

6

7

8

1 5

SK204

MOLEXPWR8

1

2

3

4

5

6SK200

MOLEXPWR6

D206BAS16W SM

TR204BC849B

R211

10K SM

R220

10R SM

R2001K0 SM TR202FMMT597

D205BAS16W SM C213

10N SM

TR203FMMT497

DZ20715V 350MW SM

+ C22310U EL

+ C22210U EL

R21010K SM

+49V

0V_TRIG

0V_TRIG

1 2

IC202A

74HC14D

3 4

IC202B

74HC14D

1011

IC202E

74HC14D

1213

IC202F

74HC14D

C21410N SM

C21510N SM

R213

4K7 SM

R214

4K7 SM

TR205BC856B

R2061K0 SM C218

10N SM

C203100N SM

DCPROT_L

DCPROT_R

+5V_D

0V_D

DCPROT_uC

0V_D

5 6

IC202C

74HC14D

89

IC202D

74HC14D

C21610N SM

C21710N SM

R215

4K7 SM

R216

4K7 SM

TR206BC856B

R2071K0 SM C220

100N SM

C204100N SM

14

7

IC202G74HC14D

C201100N SM

C202100N SM

R2051K0 SM

R221

10R SM

C224100N CD

R2191K8 SM

R212

4K7 SM

TR201FMMT497

TRIGGER OUTPUTAPPROX 13.5VDC60mA MAX CURRENT

R201

1K0 SM

R202

1K0 SM

R203

1K0 SM

R204

1K0 SM

C21910N SM

C22110N SM

MAINS WIRING AND AUXILIARY SUPPLY

POWER AMP SUPPLY

MICROPROCESSOR SIGNALS INTERFACE

HS

HS200TO220HS08REG

123456

SK205

AMPCT6

RLY200A

DPDT5V

RLY200B

DPDT5V

RLY200CDPDT5V

115V

115V6

4

2

1 0V

5

8

9V

0V

9V

37

0V

TX200

TX 3VA 9301

TR200BD179

R21710R SM

R21810K SM

STANDBY RELAY CONTROL

R2271K0 SM

DZ2044V7 350MW SM

R228

100K SM

L20027mH C200

680P PP

3

21

IC200A

LM393A SM

R22310K SM

R229100K SM

R20910K SM

R2241K8 SM

R2301K5 SM

5

67

IC200B

LM393A SM

84

IC200CLM393A SM

R2251K8 SM

C2311N0 SM

R20810K SM

C232100N SM

0V_TRIG

+5V_D

RC5 IN

CARRIER FILTER AND DEMODULATOR

C23010N SM

MODULATED RC5REMOTE CONTROL INPUT

+ C23310U EL

R222

10K SM

TRG IN

TP206

TP200

TP207

TP203

TP201

TP202

TP210

TP204

TP205

TP208

TP209

TP211

TP212

+ C20910,000u 63V

+ C21010,000u 63V

R226

470R SM

C211100N PC

C212100N PC

CHASS

SK101CCAMCON_G

C235

1N0 SM

C234

220N X2 CLASS

R231

1M5 VR25

NF

NF

F202

T750mA SM


F200

T4A

F201

T4A


1 2 3 4 5 6 7 8

A

B

C

D

87654321

D

C

B

A

ISSUE

DRAWING NO.

23425

DRAWING TITLE

Drawn by:DATE


L882C3_4.1.SCH


A85 amplifier - power output stage left

Circuit Diagram



Notes:

R324

1K0 SM

TR300FMMT597

TR301FMMT597

R315100R SM

R316100R SM

R319100R SM

TR314FMMT497

TR315FMMT497

R317100R SM

R318100R SM

R320100R SM

R32222R SM

0V_SIG

C317

470N PE

0V_SIG

0V_SIG

INPUT

0V_SIG

R3505R6 2W CF

C319100N PE

0V_HF 0V_LS

C313

100N SM

R341

330R SM

R342

330R SM

R343100R SM

R344100R SM

R3450R0 SM

R3460R0 SM

R33422K SM

R33622K SM

D301BAS16W SM

D302BAS16W SM

TR312FMMT497

TR304FMMT597

TR313FMMT497

TR302FMMT597

DZ3054V7 350MW SM

0V_HF

VIPROT

C320100U NP

TR305FMMT597

DZ3064V7 350MW SM

0V_HF

DCPROT

OUTPUT

0V_LS

0V_HF

VPOS

VNEG

0V_HF

0V_HF

DZ30015V 350MW SM

DZ30115V 350MW SM

C309100N SM

C310100N SM

C314100N SM

0V_SIG

0V_SIG

D3041N4003F

D3031N4003F

R30210K SM

R32722K SM

RV300100R PSET

C31210N SM

12

PL300

BIAS

R3251K0 SM

R3261K0 SM

ADJ BIAS

D300BAS16W SM

R30010K SM

R30910K SM

R30510K SM

R30610K SM

+ C30510U EL

MEASURE

TR318SAP15N

TR319SAP15P

R30110K SM

C315100N SM

R347

100R SM

R349

100R SM

R348

100R SM

R340100K SM

DZ3024V7 350MW SM

DZ3034V7 350MW SM

3

21

84

IC300A

TL072CD

5

67IC300B

TL072CDR3284K7 SM

0V_HF

0V_SIG

TR311FMMT497

TR303FMMT597

TR310FMMT497

TR307FMMT597

C307

100P SM

C308

100P SM

INPUT FILTER V TO I AMP

DC SERVO

PNP CURRENT MIRROR

NPN CURRENT MIRROR

PRE DRIVER

PRE DRIVER

OUTPUT STAGE

OUTPUT STAGE

V-I PROTECTION

V-I PROTECTION

VI PROTECTSIGNAL TO MICRO

DC OFFSETDETECTION

DC OFFSET SIGNALTO MICRO

ZOBEL NETWORK

TR316FMMT497

TR308FMMT597

TR317FMMT497

R31110K SM

R31210K SM

R313

10K SM

R30310K SM

R30410K SM

R30710K SM

R3104K7 SM

R3294K7 SM

+

C300100U EL

+

C301100U EL

R338150R SM

R339150R SM

R30822K SM

R31410K SM

TR309FMMT497

TR306FMMT597

R32322R SM

R32122R SM

TP302

TP303

TP304

TP307

TP308

TP305

TP306

R33722R SM

R3311K5 SM

R332

1K8 SM

R330

1M0 SM

R333

3K3 SM

R335

3K3 SM

L300

2U2H LAC SMALL

R351

10R MF

C316470P PPW

C311100N PC

+ C31810U EL

TR321FMMT597

TR320FMMT497

+ C302100U EL 100V

+ C306100U EL 100V

R352470R 2W MF 5%

R353470R 2W MF 5%

BOOTSTRAP

BOOTSTRAP

(SET TO 16mV)

+ C303100U EL

+ C304100U EL

TR322FMMT497

R3541K0 SM

R3556K8 SM



1 2 3 4 5 6 7 8

A

B

C

D

87654321

D

C

B

A

ISSUE

DRAWING NO.

23425

DRAWING TITLE

Drawn by:DATE


L882C4_4.1.SCH


A85 amplifier - power output stage right

Circuit Diagram



Notes:

R424

1K0 SM

TR400FMMT597

TR401FMMT597

R415100R SM

R416100R SM

R419100R SM

TR414FMMT497

TR415FMMT497

R417100R SM

R418100R SM

R420100R SM

R42222R SM

0V_SIG

R430

1M0 SM

R4311K5 SM

R432

1K8 SM

C417

470N PE

0V_SIG

0V_SIG

INPUT

0V_SIG

R4505R6 2W CF

C419100N PE

0V_HF 0V_LS

C413

100N SM

R441

330R SM

R442

330R SM

R443100R SM

R444100R SM

R4450R0 SM

R4460R0 SM

R43422K SM

R43622K SM

D401BAS16W SM

D402BAS16W SM

TR412FMMT497

TR404FMMT597

TR413FMMT497

TR402FMMT597

DZ4054V7 350MW SM

0V_HF

VIPROT

C420100U NP

TR405FMMT597

DZ4064V7 350MW SM

0V_HF

DCPROT

OUTPUT

0V_LS

0V_HF

VPOS

VNEG

0V_HF

0V_HF

DZ40015V 350MW SM

DZ40115V 350MW SM

C409100N SM

C410100N SM

C414100N SM

0V_SIG

0V_SIG

D4041N4003F

D4031N4003F

R40210K SM

R42722K SM

RV400100R PSET

C41210N SM

12

PL400

BIAS

R4251K0 SM

R4261K0 SM

ADJ BIAS

D400BAS16W SM

R40010K SM

R40910K SM

R40510K SM

R40610K SM

+ C40510U EL

MEASURE

TR418SAP15N

TR419SAP15P

R40110K SM

C415100N SM

R447

100R SM

R449

100R SM

R448

100R SM

R440100K SM

DZ4024V7 350MW SM

DZ4034V7 350MW SM

3

21

84

IC400A

TL072CD

5

67IC400B

TL072CDR4284K7 SM

0V_HF

0V_SIG

TR411FMMT497

TR403FMMT597

TR410FMMT497

TR407FMMT597

C407

100P SM

C408

100P SM

INPUT FILTER V TO I AMP

DC SERVO

PNP CURRENT MIRROR

NPN CURRENT MIRROR

PRE DRIVER

PRE DRIVER

OUTPUT STAGE

OUTPUT STAGE

V-I PROTECTION

V-I PROTECTION

VI PROTECTSIGNAL TO MICRO

DC OFFSETDETECTION

DC OFFSET SIGNALTO MICRO

ZOBEL NETWORK

TR416FMMT497

TR408FMMT597

TR417FMMT497

R41110K SM

R41210K SM

R413

10K SM

R40310K SM

R40410K SM

R40710K SM

R4104K7 SM

R4294K7 SM

+

C400100U EL

+

C401100U EL

R438150R SM

R439150R SM

R40822K SM

R41410K SM

TR409FMMT497

TR406FMMT597

R42322R SM

R42122R SM

(SET TO 16 mV)

TP402

TP403

TP404

TP405

TP406

TP407

TP408

R43722R SM

R433

3K3 SM

R435

3K3 SM

R451

10R MF

C416470P PPW C411

100N PC

+ C41810U EL

TR421FMMT597

TR420FMMT497

+ C402100U EL 100V

+ C406100U EL 100V

R452470R 2W MF 5%

R453470R 2W MF 5%

BOOTSTRAP

BOOTSTRAP

+ C403100U EL

+ C404100U EL

L400

2U2H LAC SMALL

TR422FMMT497

R4541K0 SM

R4556K8 SM



Display Board L928

Contents

! Component overlay

! Parts list

! Circuit diagrams

CAM Products 2000(TM): L928PB_B.GTO

L928 Display Board Parts List Issue B.3

Designator Part DescriptionC1 2C018 MLC 18P 50V X7R 10% SMC2 2C018 MLC 18P 50V X7R 10% SMC3 2C410 MLC 100N 50V X7R 10% SMC4 2C410 MLC 100N 50V X7R 10% SMC5 2C410 MLC 100N 50V X7R 10% SMC6 2C410 MLC 100N 50V X7R 10% SMC7 2C410 MLC 100N 50V X7R 10% SMC8 2C410 MLC 100N 50V X7R 10% SMC9 2C410 MLC 100N 50V X7R 10% SMC10 2C410 MLC 100N 50V X7R 10% SMC11 2M610 ELST 10U 50V SMC12 2C410 MLC 100N 50V X7R 10% SMC13 2C410 MLC 100N 50V X7R 10% SMC14 2M610 ELST 10U 50V SMC15 2C410 MLC 100N 50V X7R 10% SMC16 2C410 MLC 100N 50V X7R 10% SMC17 2C410 MLC 100N 50V X7R 10% SMC25 2C410 MLC 100N 50V X7R 10% SMC26 2M610 ELST 10U 50V SMC28 2M610 ELST 10U 50V SMC29 2M710 ELST 100U 25V SMC31 2C010A MLC 10P 50V NPO 10% SMC32 2C010A MLC 10P 50V NPO 10% SMC33 2N722 ELST 220U 16VC34 2N722 ELST 220U 16VC37 2C210 MLC 1N0 50V X7R 10% SMC38 2C210 MLC 1N0 50V X7R 10% SMC39 2C210 MLC 1N0 50V X7R 10% SMC40 2C210 MLC 1N0 50V X7R 10% SMC41 2C210 MLC 1N0 50V X7R 10% SMC43 2C210 MLC 1N0 50V X7R 10% SMC44 2C210 MLC 1N0 50V X7R 10% SMC45 2C210 MLC 1N0 50V X7R 10% SMC46 2C210 MLC 1N0 50V X7R 10% SMC47 2C210 MLC 1N0 50V X7R 10% SMC48 2C210 MLC 1N0 50V X7R 10% SMC49 2C210 MLC 1N0 50V X7R 10% SMC50 2W110X4 CAP PACK NPO 0612 4X100P 50V 5%C51 2W110X4 CAP PACK NPO 0612 4X100P 50V 5%C52 2W110X4 CAP PACK NPO 0612 4X100P 50V 5%C53 2W110X4 CAP PACK NPO 0612 4X100P 50V 5%C54 2W110X4 CAP PACK NPO 0612 4X100P 50V 5%C55 2W110X4 CAP PACK NPO 0612 4X100P 50V 5%C60 2W110X4 CAP PACK NPO 0612 4X100P 50V 5%C61 2W110X4 CAP PACK NPO 0612 4X100P 50V 5%C62 2W110X4 CAP PACK NPO 0612 4X100P 50V 5%C63 2W110X4 CAP PACK NPO 0612 4X100P 50V 5%D1 3C13304 ZENER 33V BZX55C33VD2 3AS16W DIODE SS SM BAS16WD3 3AS16W DIODE SS SM BAS16WDC1 E916PM DISPLAY CRADLE E916PMDC2 E916PM DISPLAY CRADLE E916PMDISP1 B1013 MN12818A VFD ITRONIC1 5H3048 H8/3048 128K FLASH MICROCONTROLLERIC2 5H1233A IC MICRO RESET DS1233 SMIC5 5G2402 IC CMOS EPROM 24C02 SMIC6 5M393AD IC COMPARATOR SM DUAL LM393AIC7 5M393AD IC COMPARATOR SM DUAL LM393AIC8 5M393AD IC COMPARATOR SM DUAL LM393AIC11 5M8532 DUAL OUTPUT SINGLE SUPPLY AMP AD8532LED1 3D001 LED GREEN 5MMLED2 3D001 LED GREEN 5MM


Designator Part DescriptionLED3 3D001 LED GREEN 5MMLED4 3D001 LED GREEN 5MMLED5 3D001 LED GREEN 5MMLED6 3D001 LED GREEN 5MMLED7 3D001 LED GREEN 5MMLED8 3D001 LED GREEN 5MMLED9 3D001 LED GREEN 5MMLED10 3D001 LED GREEN 5MMLED11 3D006 LED RED/GREEN 3MM L-93WEGWQ1 4A847 TRANS LF SS N SM BC847BQ2 4A847 TRANS LF SS N SM BC847BQ3 4A847 TRANS LF SS N SM BC847BQ4 4A847 TRANS LF SS N SM BC847BQ5 4B179 NPN TRANS MP BD179R1 1A310 RES SM W4 2% 10KR2 1A310 RES SM W4 2% 10KR3 1A310 RES SM W4 2% 10KR4 1A310 RES SM W4 2% 10KR5 1A310 RES SM W4 2% 10KR6 1A310 RES SM W4 2% 10KR7 1A310 RES SM W4 2% 10KR8 1A310 RES SM W4 2% 10KR9 1A310 RES SM W4 2% 10KR10 1A310 RES SM W4 2% 10KR11 1A310 RES SM W4 2% 10KR12 1A310 RES SM W4 2% 10KR13 1A310 RES SM W4 2% 10KR14 1A310 RES SM W4 2% 10KR15 1A310 RES SM W4 2% 10KR16 1A310 RES SM W4 2% 10KR17 1A133 RES SM W4 2% 330RR18 1A133 RES SM W4 2% 330RR19 1A133 RES SM W4 2% 330RR20 1A133 RES SM W4 2% 330RR21 1A133 RES SM W4 2% 330RR22 1A133 RES SM W4 2% 330RR23 1A133 RES SM W4 2% 330RR24 1A133 RES SM W4 2% 330RR25 1A133 RES SM W4 2% 330RR26 1A310 RES SM W4 2% 10KR27 1A310 RES SM W4 2% 10KR28 1A310 RES SM W4 2% 10KR29 1A310 RES SM W4 2% 10KR30 1A310 RES SM W4 2% 10KR31 1A133 RES SM W4 2% 330RR32 1A310 RES SM W4 2% 10KR33 1A133 RES SM W4 2% 330RR34 1A115 RES SM W4 2% 150RR35 1A310 RES SM W4 2% 10KR36 1A310 RES SM W4 2% 10KR37 1A310 RES SM W4 2% 10KR38 1A212 RES SM W4 2% 1K2R39 1A222 RES SM W4 2% 2K2R40 1A247 RES SM W4 2% 4K7R41 1A410 RES SM W4 2% 100KR42 1A410 RES SM W4 2% 100KR43 1A410 RES SM W4 2% 100KR44 1A410 RES SM W4 2% 100KR45 1A310 RES SM W4 2% 10KR46 1A212 RES SM W4 2% 1K2R47 1A247 RES SM W4 2% 4K7R48 1A000 RES SM W4 2% 0R0


Designator Part DescriptionR49 1A310 RES SM W4 2% 10KR50 1A310 RES SM W4 2% 10KR51 1A110 RES SM W4 1% 100R 1206R52 1A110 RES SM W4 1% 100R 1206R53 1A110 RES SM W4 1% 100R 1206R54 1H233 RES MF W4 1% 3K3R55 1A310 RES SM W4 2% 10KR56 1A310 RES SM W4 2% 10KR57 1A310 RES SM W4 2% 10KR58 1A000 RES SM W4 2% 0R0R59 1A000 RES SM W4 2% 0R0R64 1A110 RES SM W4 1% 100R 1206R65 1A110 RES SM W4 1% 100R 1206R66 1A110 RES SM W4 1% 100R 1206R67 1A110 RES SM W4 1% 100R 1206R68 1A310 RES SM W4 2% 10KR69 1A822 RES SM W4 1% 2R2 1206R70 1A822 RES SM W4 1% 2R2 1206R71 1A822 RES SM W4 1% 2R2 1206R72 1A822 RES SM W4 1% 2R2 1206R73 1A310 RES SM W4 2% 10KR74 1A310 RES SM W4 2% 10KR75 1A310 RES SM W4 2% 10KR76 1A310 RES SM W4 2% 10KRX1 B2107 REMOTE RX PIC-26043TM2 38KHZSK1 8K7014A FFC 14W 2.54MM HOR PTHSK2 8K2005 5-WAY AMP CT CONNSK3 8K8022A 22-WAY FFC CONN HORIZ 1MM PTHSK4 8K6315 14 WAY DIL HEADER HORIZSP1 F195 LED SPACERSP2 F195 LED SPACERSP3 F195 LED SPACERSP4 F195 LED SPACERSP5 F195 LED SPACERSP6 F195 LED SPACERSP7 F195 LED SPACERSP8 F195 LED SPACERSP9 F195 LED SPACERSP10 F195 LED SPACERSP101 F163 STICKY PAD S/A 10 X 15mmSP102 F163 STICKY PAD S/A 10 X 15mmSP103 E822AP IR RX SUPPORT PADSP E822AP IR RX SUPPORT PADSW1 A1505 TACT SWITCH SM SDTM-610-NTRSW2 A1505 TACT SWITCH SM SDTM-610-NTRSW3 A1505 TACT SWITCH SM SDTM-610-NTRSW4 A1505 TACT SWITCH SM SDTM-610-NTRSW5 A1505 TACT SWITCH SM SDTM-610-NTRSW6 A1505 TACT SWITCH SM SDTM-610-NTRSW7 A1505 TACT SWITCH SM SDTM-610-NTRSW8 A1505 TACT SWITCH SM SDTM-610-NTRSW9 A1505 TACT SWITCH SM SDTM-610-NTRSW10 A1505 TACT SWITCH SM SDTM-610-NTRSW11 A1505 TACT SWITCH SM SDTM-610-NTRSW12 A1505 TACT SWITCH SM SDTM-610-NTRSW13 A1505 TACT SWITCH SM SDTM-610-NTRSW14 A1505 TACT SWITCH SM SDTM-610-NTRSW15 A1505 TACT SWITCH SM SDTM-610-NTRSW16 A1505 TACT SWITCH SM SDTM-610-NTRSW17 A1505 TACT SWITCH SM SDTM-610-NTRSW18 A1211 EC16B2414X1 7X040 XTAL 16MHZ SM GSX49-4

1 2 3 4 5 6 7 8

A

B

C

D

87654321

D

C

B

A

ISSUE

DRAWING NO.

23425

DRAWING TITLE

Drawn by:DATE


J:\Released_Documents\Native_format_files\Protel_DDB\L928_B.3.Ddb - Documents\L928CT_1_B.3.PRJ


A32 FMJ AMP DISPLAY PCB

Circuit Diagram

L928CT1CL10-Oct-2001INITIALS


Notes:

L928CT_B.1L928CT_2_B.3.SCH

FD_1

FIDUCIAL

FD_2

FIDUCIAL

A32 FMJ DISPLAY PCB

MICRO

PCB

PCB1

L928PB_B

CHASSIS 1

CHASSIS 2

CHASSIS 3

(BY SK3)

(BY SK1)

(BY SK2)

C391N0 SM

C451N0 SM

C401N0 SM

C411N0 SM

C431N0 SM

C441N0 SM

C461N0 SM

C471N0 SM C491N0 SM

C481N0 SM

0V_D

0V_D 0V_D 0V_D 0V_D

0V_D0V_D0V_D0V_D

0V_D

CL INITIAL PROTOTYPE25/04/01 A.0

FIX2FIXING HOLE 3.5

FIX7FIXING HOLE 3.5

FIX10FIXING HOLE 3.5

FIX5FIXING HOLE 3.5



FIX3FIXING HOLE 3.5

FIX8FIXING HOLE 3.5

FIX1FIXING HOLE 3.5

FIX6FIXING HOLE 3.5

FIX9FIXING HOLE 3.2


C381N0 SM

C371N0 SM

0V_D

0V_D

WAF 9/08/01 UPDATED PROTOTYPE B.0

JBR 10/9/01 PRE PRODUCTION RELEASE B.2

WAF 26/9/01 STICKY PADS RENUMBERED B.3

1 2 3 4 5 6 7 8

A

B

C

D

87654321

D

C

B

A

ISSUE

DRAWING NO.

23425

DRAWING TITLE

Drawn by:DATE


J:\Released_Documents\Native_format_files\Protel_DDB\L928_B.3.Ddb - Documents\L928CT_2_B.3.SCH


A32 FMJ AMP DISPLAY PCB

Circuit Diagram

L928CT2CL10-Oct-2001INITIALS


Notes:

Vcc1

PB02

PB13

PB24

PB35

PB46

PB57

PB68

PB79

Vpp/RESO10

Vss11

TxD0/P9.012

TxD1/P9.113

RxD0/P9.214

RxD1/P9.315

IRQ4/SCK0/P9.416

IRQ5/SCK1/P9.517

D0/P4.018

D1/P4.119

D2/P4.220

D3/P4.321

Vss22

D4/P4.423

D5/P4.524

D6/P4.625

D7/

P4.7

26

D8/

P3.0

27

D9/

P3.1

28

D10

/P3.

229

D11

/P3.

330

D12

/P3.

431

D13

/P3.

532

D14

/P3.

633

D15

/P3.

734

Vcc

35

A0/

P1.0

36

A1/

P1.1

37

A2/

P1.2

38

A3/

P1.3

39

A4/

P1.4

40

A5/

P1.5

41

A6/

P1.6

42

A7/

P1.7

43

Vss

44

A8/

P2.0

45

A9/

P2.1

46

A10

/P2.

247

A11

/P2.

348

A12

/P2.

449

A13

/P2.

550

P2.6/A14 51P2.7/A15 52P5.0/A16 53P5.1/A17 54P5.2/A18 55P5.3/A19 56

Vss 57P6.0/WAIT 58P6.1/BREQ 59P6.2/BACK 60

CLKOUT 61STBY 62

RES 63NM1 64

Vss 65EXTAL 66

XTAL 67Vcc 68

P6.3/AS 69P6.4/RD 70

P6.5/HWR 71P6.6/LWR 72

MD0 73MD1 74MD2 75

AV

cc76

Vre

f77

P7.0

/AN

078

P7.1

/AN

179

P7.2

/AN

280

P7.3

/AN

381

P7.4

/AN

482

P7.5

/AN

583

P7.6

/AN

6/D

A0

84P7

.7/A

N7/

DA

185

AV

ss86

P8.0

/IRQ

087

P8.1

/IRQ

188

P8.2

/IRQ

289

P8.3

/IRQ

390

P8.4

/CS0

91V

ss92

PA0

93PA

194

PA2

95PA

396

PA4

97PA

598

PA6

99PA

710

0

H8/3048F

IC1

H8/3048F

Gnd1

Res2Vcc3

DS1

233

Gnd4

IC2

DS1233 SM

R110K SM

R210K SM

R310K SM

R410K SM

R510K SM

R610K SM

R710K SM

R810K SM

R910K SM

R1010K SM

R1110K SM

R1210K SM

R1310K SM

R1410K SM

R1510K SM

R1610K SM

0V_D

R17330R SM

R18330R SM

R19330R SM

R21330R SM

R22330R SM

R25330R SM

BUT1

1

BUT2

BUT3

BUT4

BUT1

3

BUT6

BUT7

BUT8

BUT9

BUT1

2

BUT1

4

BUT1

BUT1

0

BUT5

BUT1

5

BUT1

6

0V_D

C118P SM

C218P SM

Programming adaptor

+5V

0V_D

+5V

+5V

D2BAS16W SM

+5V

R26

10K SM

+5V

IND

10

IND

2

IND

8

IND

1

IND

5

IND

6

IND

9

IND

4

IND

3

IND

7

0V_D

+5V

R27

10K

SM

R28

10K

SM

R34150R SM

R33330R SM

0V_D

+5V

0V_D

+5V

To preamp board

SEL1SEL2SEL3SEL4SEL5SEL6SEL7SEL8SEL9

LEFTAUDIO

MUTETONE

TONEID

SDATA

SLOAD

SCLK

0V_D

PHASEAPHASEB

+5V

PHAS

EAPH

ASEB

+5V

0V_D

A0

1A

12

A2

3

VSS4

SDA

5

SCL

6

WP

7

VDD 8

IC524C02 SM

0V_D

R3210K SM

+5V

DISPCLK

DISPDAT

DIS

PDAT

DIS

PCLK

0V_D

F1 to F2 = 4Vac 150mAVDD2 = 40Vdc 20mA

+5V

DIS

PLAT

DIS

PBLK

3

21

IC6A

LM393A SM

5

67

IC6B

LM393A SM

84

IC6CLM393A SM

C3100N SM

C4100N SM

0V_D

0V_D

C5100N SM

0V_D

DISPBLKDISPLAT

BUT9BUT8BUT7BUT6BUT2IND3

BUT3

BUT1

IND

1BU

T5IN

D2

BUT4

IND

12IN

D11

BUT1

6IN

D6

BUT1

5IN

D5

BUT1

0IN

D7

BUT1

2IN

D9

BUT1

4IN

D4

BUT1

1IN

D8

BUT1

3

C6100N SM

C7

100N SM

C8100N SM

C9

100N SM

C10100N SM

0V_D

+5V

R35

10K SM

R36

10K SM

R3710K SM

R381K2 SM

R39

2K2 SM

R404K7 SM

+5V

+5V

+5V

0V_D

0V_D

+ C1110U EL SM

R41100K SM

R42100K SM

0V_D

+5V

R43100K SM

R44100K SM

3

21

IC7ALM393A SM

5

67

IC7B

LM393A SM

84

IC7CLM393A SM

0V52V7

2V7

0V5

3

21

IC8A

LM393A SM

5

67

IC8B

LM393A SM

84

IC8CLM393A SM

R4510K SM

R461K2 SM

R474K7 SM

0V5

2V7+5V

+5V

0V_D

0V_D

R48

0R0

SM

SCLKSLOAD

SDATATONEID

SEL1SEL2SEL3SEL4SEL5SEL6SEL7

SEL8

SEL9

MU

TETO

NE

+ C1410U EL SM

C15100N SM

0V_D

C16100N SM

12345

SK2

AMPCT5

SAMTX2

SAMRX2

SAMRX2SAMTX2

SAMBUSYSAMDATA

+5V

0V_D

IND

10

C17100N SM

0V_D

D3BAS16W SM

R5510K SM

+5V

PR_TXDPR_GND

PR_RESETPR_MD

PR_PMODEPR_VPP

PR_RXDPR_VCC

VFD_VDD2

3

21

IC11AAD8532 SM

5

67

IC11BAD8532 SM

84

IC11CAD8532 SM C25

100N SM

DC

PRO

TVI

PRO

T

F1C

LOC

KF2

CLO

CK

STANDBYSP1ONSP2ONTHERMPROT

+5V

0V_D

F1CLOCK

F2CLOCK

+SUP VFD_VDD2

+

C2810U EL SM

0V_D

R5610K SM

R5710K SM

Q_1Q_2Q_3Q_4Q_5Q_6Q_7Q_8Q_9

Q_10

Q_11Q_12

Q_14

Q_15

Q_16

Q_17

Q_19

Q_20

Q_21 Q_22

Q_23

R58

0R0 SM

R59

0R0 SM

R64100R SM

R65

100R SM R66100R SMR67

100R SM

C3110P SM

C3210P SM

0V_D

R4910K SM

R5010K SM

+5V

Q_34SAMHOLD

SAMHOLD

R51100R SM

Q_35

Q_37

Q_38

Q_39

Q_40Q_41

Q_42

Q_43

Q_44

Q_45

Q_46

Q_47Q_48

Q_49

Q_50

Q_51

Q_52

Q_53Q_54

Q_55

Q_56

Q_57

Q_58

Q_59

Q_64

Q_65 Q_66 Q_67 Q_68 Q_69 Q_70 Q_71 Q_72 Q_73 Q_74

Q_75

Q_78

Q_79 Q_80

Q_81

Q_82

Q_8

3Q

_84

Q_8

5

Q_86Q_87Q_88Q_89Q_90Q_91

Q_9

2Q

_93

Q_9

4Q

_95

Q_9

6Q

_97

Q_98

Q_9

9Q

_100

Q_1

01Q

_102

Q_1

03Q

_104

Q_1

05Q

_106

Q_1

07Q

_108

Q_1

09Q

_110

Q_1

11Q

_112

Q_1

13Q

_114

Q_115

Q_116

R20330R SM

R23330R SM

R24330R SM

R31330R SM

R G

LED11

LED RED/GRN 3MM

Q1BC847B

Q2BC847B

R2910K SM R30

10K SM

0V_D

IND

11

IND

12

R6810K SM

BUT1

7

BUT17

0V_D

+5V

+SUP

STANDBYSP1ONSP2ONTHERMPROTVIPROTDCPROTACPRESENT

ACPR

ESEN

T

0V_D

R69

2R2

SM

R70

2R2

SM

R71

2R2

SM

R72

2R2

SM

0V_D

IRIN

Q3BC847B

Q4BC847B

R7310K SM

R7410K SM

R7510K SM

R76

10K SM

0V_D

+5V

IRIN

IRIN

IROUT

C12

100N SM

(FIT CLOSE TO SK1)

+5V

0V_D

+ C33220U EL

+ C34220U EL

SAMDATASAMBUSY

IRIN

C 3

B 2A 1

4 5

SW18ALPS_ENCODER

LED7

LED GREEN

LED8

LED GREEN

LED6

LED GREEN

LED3

LED GREEN

LED10

LED GREEN

LED9

LED GREEN

LED1

LED GREEN

LED4

LED GREEN

LED2

LED GREEN

LED5

LED GREEN

RECEIVE

TRANSMIT

TRANSMIT

TRANSMIT

RECEIVE

RECEIVE

RESPIN

RESPIN

PB0

PB0

VPROG

VPROG

1234567891011121314

SK1

FFC 14W 2.54MM HOR

12345678910111213141516171819202122

SK3

FFC 22W 1MM HOR

To power amp / PSU

0V_D

C50A 100PX4 SMC50B 100PX4 SM

C50C 100PX4 SMC50D 100PX4 SM










CHASSIS 1

C60D 100PX4 SMC60C 100PX4 SM

C60B 100PX4 SMC60A 100PX4 SM






CHASSIS 2

+ C29100U EL SM

R52

100R SM

R53

100R SM

LEFTAUDIO

+

C2610U EL SM


C63B 100PX4 SM

C63A 100PX4 SM

X116MHZ SM

F11

F12

F13

SIN

4

VD

D1

5

SOU

T6

LAT

7

BLK

8

CLK

9

VSS

10

VSS

11

VD

D2

12

F215

F216

F217

Graphics Display

DISP1B1013

12345678910

11121314

SK4

HEADER 7X2HORIZ

STICKY PADDOUBLE SIDED

10 X 15MM

SP101

STICKY PAD DS 10X15MM

STICKY PADDOUBLE SIDED

10 X 15MM

SP102

STICKY PAD DS 10X15MM

Q_122Q_123Q_124Q_125Q_126Q_127Q_128

Q_129

Q_120

Q_119

Q_118

Q_117

Q_121

CL 25/04/01 INITIAL PROTOTYPE A.0

+5V

3

O/P2

GN

D1

Cas

eC

ase

O/P

GN

D+5

V

RX1SBX1610-52/PIC-26043TM2

Q5BD179 NPN TO-126

R543K3 MF

DISPLAY CRADLEE916PM

DC1

DISPLAY CRADLE E916PM

DISPLAY CRADLEE916PM

DC2

DISPLAY CRADLE E916PM

SW6TACTSW A1505

SW12TACTSW A1505

SW11TACTSW A1505

SW8TACTSW A1505

SW7TACTSW A1505

SW13TACTSW A1505

SW14TACTSW A1505

SW15TACTSW A1505

SW16TACTSW A1505

SW17TACTSW A1505

SW1TACTSW A1505

SW2TACTSW A1505

SW3TACTSW A1505

SW4TACTSW A1505

SW5TACTSW A1505

SW9TACTSW A1505

SW10TACTSW A1505

POWER SP1SP2TONE DOWN UP ENTERMODE RECORD SELECT

C13

100N SM

AV DVD CD TUNER VCRPHONO/

AUX TAPE

IR RXSUPPORT PAD

SP

IR RX SUPPORT PAD

LED

SPAC

ER

SP1

SPACER F195

LED

SPAC

ER

SP2

SPACER F195

LED

SPAC

ER

SP3

SPACER F195

LED

SPAC

ER

SP4

SPACER F195

LED

SPAC

ER

SP5

SPACER F195

LED

SPAC

ER

SP6

SPACER F195

LED

SPAC

ER

SP7

SPACER F195

LED

SPAC

ER

SP8

SPACER F195

LED

SPAC

ER

SP9

SPACER F195

LED

SPAC

ER

SP10

SPACER F195

WAF 9/08/01 UPDATED PROTOTYPE B.0

IR RXSUPPORT PAD

SP103

IR RX SUPPORT PAD

PLACE ONE ON TOP OFTHE OTHER UNDER RX1

D1ZENER 400MW 33V

JBR 10/9/01 PRE PRODUCTION RELEASE B.2

WAF 26/9/01 STICKY PADS RENUMBERED B.3

Preamplifier Board L937

Contents


! Component overlay

! Parts list

! Circuit diagrams

Pre-amplifier circuit description Refer to L937 circuit diagrams The A32 preamplifier is a high-performance, DC coupled design with microprocessor control of input select, two independent tape loops, electronic volume control, tone bypass and electronic tone control. It features a discrete power supply and low-noise linear circuitry to obtain very good distortion and noise performance, suitable for high quality source material such as CD or DVD-A. Input switching Each of the inputs has a pair of diodes to the ±15V rails to prevent static spikes from causing damage to the CMOS multiplexers. In addition, there is a simple resistor-capacitor filter with a corner frequency of approximately 340kHz to remove any unwanted high frequency interference from the signal. This uses high-quality polypropylene capacitors for best performance. Z104 and Z105 are the main input select multiplexers, which are configured in a ‘virtual earth’ unity gain arrangement with Z115 and Z116. This arrangement is slightly lower distortion than the ‘normal’ one, at the cost of a slightly higher noise floor. It is an inverting configuration, which is restored to correct polarity by the inverting electronic volume control which follows. Z115B and Z116B are integrating servos, which take out any DC from the input signal before the following stages. The servos are 2-pole, with a passive 2 nd pole being formed by R180 and C147 (for the left channel) to remove broadband noise from the output of the servo and improve speed of response. Z100 thru Z103 are the input selectors for the 2 tape loops. These are normal non-inverting selectors which are buffered before being passed on to the phono sockets. Z109A output is decoupled by R108 which is included in the feedback path. Local high frequency feedback occurs around C108 to allow the tape loop output to be very low impedance, whilst being stable into a capacitive load such as may be presented by a screened interconnect cable. This is the same for all tape outputs. Z106 is configured as a double pole changeover switch, used to select the tone controls. The tone controls are bypassed when not required so that the noise and distortion can be minimised. Tone control circuit The tone control circuit is a non-inverting one, using a gyrated ‘bell’ filter for the bass and a simple shelving filter for the treble. Left channel description The input is attenuated by 6dB and biased to a voltage of +2.5V DC by C111, R113, R112, R110, R111 and C110. This is so the signals fall within the 0 - 5VDC required by the digital potentiometer Z108. Z111B and its associated components form an active equivalent of a series resonant LCR circuit. This has an impedance minimum of 5.4k˜ at around 80Hz with Q=0.7 The reason the bass is done as a band-boost filter rather than a shelving filter is so that you can boost the ‘real’ bass without causing lots of sub-audio loudspeaker cone

excursion which wastes power and may damage the drive units. The digital pots Z108D and Z108A control the bass and treble respectively. This is done by moving the wiper connected to the frequency-sensitive impedance between the non-inverting and inverting terminals of Z112A, effectively changing the ratio of feedback boost and feed-forward attenuation of the circuit at the desired frequencies, thus providing a EQ gain control that is symmetrical on a logarithmic scale, with the use of a linear pot. Z112B provides the 6dB of gain necessary to bring the nominal signal level back to unity. C116 and C117 remove the 2.5VDC offset from the output, to prevent clunks when the tone controls are activated. Z108 is controlled by a simple 3-wire serial interface from the microprocessor. Each of the digital lines has its own ground return to minimise electromagnetic interference. They are connected together only at the GND pin of the IC. Volume control Z107 is a VSDVC electronic volume control IC. It works, in conjunction with an external op-amp, by varying the feed-forward and feedback resistors in an inverting gain configuration. In this way, it can allow output signal swings of up to 22Vpp whilst operating from a single +5VDC power supply. Also, it allows the user the choice of external circuitry to fine-tune the performance. The gain is controlled from the microprocessor via a 3-wire serial interface. The analogue supply rail is derived from the local +5V via R185 and C156 // C157. Z117 is the output op-amp. Its outputs are decoupled via R186, R187, C158 and C159 so that it has a low output impedance but can drive cable capacitance without oscillation. R186 and R187 are included in the audio frequency feedback loop to reduce output impedance when driving ‘difficult’ cables. RLY100 is a mute relay which shunts the preamp output to ground. This is to prevent thumps and squeals when the units is powered up or down. Power supply The transformer winding is connected to SK300. The voltage is rectified and smoothed by D300, D301, D306, D307 and C300, C310. The unregulated voltage should be around ±27VDC. F300 and F301 are secondary fuses, as the low power preamp winding would not blow the primary fuses if short circuited. The voltage regulators are discrete compound emitter followers. I will describe the +15V supply as the negative is essentially an exact mirror image. Q300 and R300 act as a constant current source, supplying around 7mA into D310. C302 and C314 reduce ripple and broadband noise on the zener diode. Q305 and Q306 form a complementary Darlington NPN transistor which is configured as an emitter follower, producing the +15VDC at its output. C303 is to provide bulk charge storage and to reduce the AC output impedance of the power supply. D302 prevents reverse bias of the supply during power down. Z301 is a conventional LM317 type circuit to drop the +15V rail down to +5V for the tone and volume control circuits. Star point SP300 explicitly connects the differently named ground nets together at one point, to minimise hum.

L937 Preamplifier Board Parts List Issue 1.0

Designator Part DescriptionC100 2C210 MLC 1N0 50V X7R 10% SMC101 2D147W WIMA FKP2 470P 63V CAPC102 2D147W WIMA FKP2 470P 63V CAPC103 2D147W WIMA FKP2 470P 63V CAPC104 2C410 MLC 100N 50V X7R 10% SMC105 2C410 MLC 100N 50V X7R 10% SMC106 2C410 MLC 100N 50V X7R 10% SMC107 2C410 MLC 100N 50V X7R 10% SMC108 2C110 MLC 100P 50V NPO 5% SMC109 2C110 MLC 100P 50V NPO 5% SMC110 2N710 ELST 100U 25VC111 2P610CC ELEC 10U 50V CERAFINEC112 2K447 PEST 470N 63V 10%C113 2K447 PEST 470N 63V 10%C114 2D222W WIMA FKP2 2N2 63V CAPC115 2C022 MLC 22P 50V NPO 5% SMC116 2P610CC ELEC 10U 50V CERAFINEC117 2P610CC ELEC 10U 50V CERAFINEC118 2C410 MLC 100N 50V X7R 10% SMC119 2C310 MLC 10N 50V X7R 10% SMC120 2N610 ELST 10U 50VC121 2C210 MLC 1N0 50V X7R 10% SMC122 2D147W WIMA FKP2 470P 63V CAPC123 2D147W WIMA FKP2 470P 63V CAPC124 2D147W WIMA FKP2 470P 63V CAPC125 2C410 MLC 100N 50V X7R 10% SMC126 2C410 MLC 100N 50V X7R 10% SMC127 2C410 MLC 100N 50V X7R 10% SMC128 2C410 MLC 100N 50V X7R 10% SMC129 2C110 MLC 100P 50V NPO 5% SMC130 2C110 MLC 100P 50V NPO 5% SMC131 2N710 ELST 100U 25VC132 2P610CC ELEC 10U 50V CERAFINEC133 2K447 PEST 470N 63V 10%C134 2K447 PEST 470N 63V 10%C135 2D222W WIMA FKP2 2N2 63V CAPC136 2C022 MLC 22P 50V NPO 5% SMC137 2P610CC ELEC 10U 50V CERAFINEC138 2P610CC ELEC 10U 50V CERAFINEC139 2C210 MLC 1N0 50V X7R 10% SMC140 2D147W WIMA FKP2 470P 63V CAPC141 2D147W WIMA FKP2 470P 63V CAPC142 2D147W WIMA FKP2 470P 63V CAPC143 2C410 MLC 100N 50V X7R 10% SMC144 2C410 MLC 100N 50V X7R 10% SMC145 2C410 MLC 100N 50V X7R 10% SMC146 2C410 MLC 100N 50V X7R 10% SMC147 2K410 PEST 100N 63V 10%C148 2C022 MLC 22P 50V NPO 5% SMC149 2C022 MLC 22P 50V NPO 5% SMC150 2K447 PEST 470N 63V 10%C151 2K447 PEST 470N 63V 10%C152 2C410 MLC 100N 50V X7R 10% SMC153 2C410 MLC 100N 50V X7R 10% SMC154 2N610 ELST 10U 50VC155 2C410 MLC 100N 50V X7R 10% SMC156 2C410 MLC 100N 50V X7R 10% SMC157 2N710 ELST 100U 25VC158 2C022 MLC 22P 50V NPO 5% SMC159 2C022 MLC 22P 50V NPO 5% SMC160 2C210 MLC 1N0 50V X7R 10% SMC161 2D147W WIMA FKP2 470P 63V CAP

L937 Preamplifier Board Parts List Issue 1.0

Designator Part DescriptionC162 2D147W WIMA FKP2 470P 63V CAPC163 2D147W WIMA FKP2 470P 63V CAPC164 2C210 MLC 1N0 50V X7R 10% SMC165 2D147W WIMA FKP2 470P 63V CAPC166 2D147W WIMA FKP2 470P 63V CAPC167 2K410 PEST 100N 63V 10%C168 2C410 MLC 100N 50V X7R 10% SMC169 2C410 MLC 100N 50V X7R 10% SMC170 2C410 MLC 100N 50V X7R 10% SMC171 2C410 MLC 100N 50V X7R 10% SMC172 2C410 MLC 100N 50V X7R 10% SMC173 2C410 MLC 100N 50V X7R 10% SMC174 2C410 MLC 100N 50V X7R 10% SMC175 2C410 MLC 100N 50V X7R 10% SMC176 2C410 MLC 100N 50V X7R 10% SMC177 2C410 MLC 100N 50V X7R 10% SMC178 2C410 MLC 100N 50V X7R 10% SMC179 2C410 MLC 100N 50V X7R 10% SMC180 2C410 MLC 100N 50V X7R 10% SMC181 2C410 MLC 100N 50V X7R 10% SMC182 2C410 MLC 100N 50V X7R 10% SMC183 2C410 MLC 100N 50V X7R 10% SMC184 2C410 MLC 10