MCLR9

VDD

12

VDD

32

VDD

48

VDD

71

AVD

D25

VS

S11

VS

S31

VS

S51

AV

SS

26

VDDCORE70

SCL2/INT3/RA252

SDA2/INT4/RA353

AN22/CN22/RA676

AN23/CN23/RA777

VREF-/RA923

VREF+/RA1024

TMS/AN20/INT1/RA1213

TDO/AN21/INT2/RA1314

PGD3/EMUD3/AN0/CN2/RB020

PGC3/EMUC3/AN1/CN3/RB119

AN2/SS1/CN4/RB218

AN3/CN5/RB317

AN4/CN6/RB416

AN5/CN7/RB515

PGC1/EMUC1/AN6/OCFA/RB621

PGD1/EMUD1/AN7/RB722

U2CTS/AN8/RB827

AN9/RB928

AN10/RB1029

AN11/RB1130

TCK/AN12/RB1233

TDI/AN13/RB1334

U2RTS/AN14/RB1435

AN15/OCFB/CN12/RB1536

AN16/T2CK/T7CK/RC12

AN17/T3CK/T6CK/RC23

AN18/T4CK/T9CK/RC34

AN19/T5CK/T8CK/RC45

OSC1/CLKIN/RC1249

PGD2/EMUD2/SOSCI/CN1/RC1359

PGC2/EMUC2/SOSCO/T1CK/CN0/RC1460

OSC2/CLKO/RC1550

OC1/RD0 58

OC2/RD1 61

OC3/RD2 62

OC4/RD3 63

OC5/CN13/RD4 66

OC6/CN14/RD5 67

OC7/CN15/RD6 68

OC8/CN16/RD7 69

IC1/RD8 54

IC2/RD9 55

IC3/RD10 56

IC4/RD11 57

IC5/RD12 64

IC6/CN19/RD13 65

IC7/U1CTS/CN20/RD14 37

IC8/U1RTS/CN21/RD15 38

C1TX/RF1 73

U1RX/RF2 42

U1TX/RF3 41

U2RX/CN17/RF4 39

U2TX/CN18/RF5 40

SCK1/INT0/RF6 45

SDI1/RF7 44

SDO1/RF8 43

C2RX/RG0 75

C2TX/RG1 74

SCL1/RG2 47

SDA1/RG3 46

SCK2/CN8/RG6 6

SDI2/CN9/RG7 7

SDO2/CN10/RG8 8

SS2/CN11/RG9 10

CSDI/RG12 79

CSDO/RG13 80

CSCK/RG14 78

COFS/RG15 1

C1RX/RF0 72

U1

DSPIC33FJ128GP708

+3.3V

C1

10uFX5R

C2100nFX7R

C3100nFX7R

C4100nFX7R

C5100nFX7R

C6

100nFX7R

MCLR

R110K

+3.3V

12345

ICSP/ICD

J1

+3.3V

PGDPGC

MCLR

GATE

I1 O112345678

GATE IN

J3

GATE 1GATE 2GATE 3GATE 4GATE 5

GATE 6

GATE 7

GATE 8

GATE 1GATE 2GATE 3GATE 4GATE 5GATE 6GATE 7GATE 8

CV

I1a O1 CV 1

CV 2

CV 3

CV 4

CV 5CV 6CV 7CV 8CV 9CV 10CV 11CV 12

CV 1CV 2

CV 3CV 4CV 5CV 6CV 7CV 8CV 9

CV 10CV 11CV 12

A03

A14

A25

A36

A47

A516

A617

A718

A819

A920

A1026

A1127

A1228

WE 15OE 37

CE 8

IO0 9

IO1 10

IO2 13

IO3 14

IO4 31

IO5 32

IO6 35

IO7 36

A1329

A1430

VCC

11V

SS

12

A1538

A1639

A1740

A1841

VS

S34

VCC

33U2

CY7C1049DV33

C8100nFX7R

SRAM OESRAM WE

SRAM OESRAM WE

SRAM A0SRAM A1SRAM A2

SRAM A4SRAM A3

SRAM A5SRAM A6SRAM A7SRAM A8SRAM A9

SRAM A10SRAM A11SRAM A12SRAM A13SRAM A14SRAM A15SRAM A16SRAM A17SRAM A18

DIO SCK1DIO SDI1DIO SDO1

DIO SDI2DIO SCK2

DIO SDO2

DIO SCL1DIO SDA1

DIO GPIO

DIO SS2

DIO GPIO

DIO SS2

DIO SCK1DIO SDI1DIO SDO1

DIO SCL1DIO SDA1DIO SCK2DIO SDI2DIO SDO2

SRAM A0SRAM A1SRAM A2SRAM A3SRAM A4SRAM A5SRAM A6SRAM A7SRAM A8SRAM A9SRAM A10SRAM A11SRAM A12

SRAM A14SRAM A13

SRAM A15

SRAM A16SRAM A17

SRAM A18

I2 O2I3 O3I4 O4I5 O5I6 O6I7 O7I8 O8

I1bI2a O2I2bI3a O3I3bI4a O4I4bI5 O5I6 O6I7 O7I8 O8I9 O9I10 O10I11 O11I12 O12

PGDPGC

AUDIO

POWER

+ 4

- 5

MIDIIN

J10

+ 4

GND 2

- 5

MIDITHRU

J11

+ 4

GND 2

- 5

MIDIOUT

J12

A+3.3V

MIDI

IN1RET1

IN2RET2

OUT1

OUT2

SCLKLRCK

SDOUTSDINCSDOCSCKCOFS

CSDI

U1RXU1TX

CSDOCSDI

CSCKCOFS

LED1LED2

TX

I+

I-

T+TGT-

O+OGO-

RX U1RXU1TX

LED1R5515K

Q1MMBT3904

R531K5

CLIP1

D9

+15V

LED2R5615K

Q2MMBT3904

R541K5

CLIP2

D10

+15V

EEPROM

CKDIDO

123456789101112

DIRECT I/O

J2

+3.3V

1234

SAMPLE RATE

J8

MDIV1MDIV2

+3.3V

RET1 CV

RET2 CV

12345678

AUDIO I/O

J7

EXT+15V

EXT-15VEXT+5V

CS

C71100nFX7R

+15V

12345678910111213141516

CV IN

J4

CV OUT

CKDICS

DIO SCK2DIO SDO2

DIO SS2

CV1CV2CV3CV4

1234

CV OUT

J9

1234

POWER

J5

1234

GND

J6

V+

4G

ND

2

EN1

OUT3

X112 MHz

IN1

IN2RET2

OUT1

SCLKLRCK

SDOUTSDIN

MCLK 3

LRCK 2

SDOUT M/S 7SDIN 1

VLC

8

AGN

D20

AINA15

AINB16

RST14 I2S/LJ11 M19 M010

VD

5D

GN

D6

MUTEA 21

FILT+ 18

SCLK 4

VQ17

VA

19

AOUTA 22

AOUTB 23

MUTEB 24

MDIV112

MDIV213

U9

CS4270

R7951K

C41100nFX7R

+3.3V

R8010K

C422.2uFX5R

D111N4148

+3.3V

R8110K

MDIV1MDIV2

RET2 CV

C46100nFX7R

-15V

+15V

RET1RET1 CV

INPUT BUFFER

INRETRET CV

OUT

C52100nFX7R

C53100nFX7R

INPUT BUFFER

INRETRET CV

OUT

C59100nFX7R

C6010uFX5R

C61100nFX7R

+C6247uF

+3.3V +5V

C641uFX7R

R1042K

R1052K

C661uFX7R

+3.3V

OUTPUT BUFFER

IN OUT

OUT2

OUTPUT BUFFER

IN OUT

C72100nFX7R

I1 O1R2100K

+3.3VD1BAT54S

I2 O2R3100K

+3.3VD2BAT54S

I3 O3R4100K

+3.3VD3BAT54S

I4 O4R5100K

+3.3VD4BAT54S

I5 O5R6100K

+3.3VD5BAT54S

I6 O6R7100K

+3.3VD6BAT54S

I7 O7R8100K

+3.3VD7BAT54S

I8 O8R9100K

+3.3VD8BAT54S

R771M

R781M

R1161M

R601M

R1341M

R1351M

R1361M

R1371M

2IN

Ia

IbO

I1a

I1bO1

-15V

R1433K

-1.65V

R1516K

1 3

2RV1

1KOFFSET TRIM

C15100nFX7R

C16100nFX7R

C28100nFX7R

A+3.3V

1IN

I OI5 O5

2IN

Ia

IbO

I2a

I2bO2

2IN

Ia

IbO

I3a

I3bO3

2IN

Ia

IbO

I4a

I4bO4

1IN

I OI6 O6

1IN

I OI7 O7

1IN

I OI8 O8

1IN

I OI9 O9

1IN

I OI10

1IN

I OI11 O11

1IN

I OI12 O12

O10

3

26

74

1 8

U3

OP07

+15V

A+3.3V

I+

I-TX

T+

TG

T-

O+

O-

OG

R6162R

R6262R

+3.3V

+2

-3

VB 7

VO 6

VCC

8G

ND

5U11

6N139

R591K

R63220R

R5862R

R641K5

R5762R

RX

+3.3V

+3.3V

+U12

74LVC1G34

+3.3V

C63100nFX7R

+3.3V

VI1 VO 3

GN

D2

U4LM2937-3.3

C7100nFX7R

C1010uFX5R

+3.3V

+15V

C11330nFX7R

C12100nFX7R

+5V

VI8 VO 1

GN

D2

GN

D3

GN

D6

GN

D7

U578L05

C1310uFX5R

FB3FERRITE BEAD

A+3.3V

EXT+15V

EXT-15V

EXT+5V

+15V

-15V

FB1FERRITE BEAD

FB2FERRITE BEAD

C4310uF16V+X5R

C5110uF16V+X5R

CKDI

DO

+3.3V

CS1

WP3

DIO5 CLK6 HLD7

DO2

VCC

8G

ND

4

U13W25X80AorAT26DF081A-SU C44

100nFX7RCS

SYNC9 DIN7 SCLK6 VOUTA 1

VOUTD 5

VDD

8G

ND

3

REFIN10

VOUTB 2

VOUTC 4

U18

DAC7554

3

21

411

U19:A

TL074

CK

If accurate CV output is required(e.g. for pitch CV) then use abetter OpAmp for U19, with lowinput offset voltage and drift.

DICS

CV1A+3.3V

R16100R

+15V

-15V

C65

47pFC0G

R122100K

R12730K

R12630K

-1.65V

5

67

U19:B

TL074

CV2R119100R

C73

47pFC0G

R120100K

R12130K

R12330K

-1.65V

10

98

U19:C

TL074

CV3R124100R

C74

47pFC0G

R125100K

R12830K

R12930K

-1.65V

12

1314

U19:D

TL074

CV4R130100R

C75

47pFC0G

R131100K

R13230K

R13330K

-1.65V

IN7

EC+

6

V+

12V

-5

EC-

4

OUT 2

SYM

3G

ND

8

U10:A

THAT2162

RET

R82100K

R83100K

R842K

R852K7

R86510R

3

21

84

U14:A

4580

R8720K

R886K8

+15V

-15V

RET CV

3

21

84

U15:A

TL072

R89510K

R9012K

+15V

-15V

R91100K

-15V

R922K

+15V

-15V

C45

22pFC0G

IN

5

67

U14:B

4580

+C47

10uF

C48220pFC0G

OUT

RET CV => 0 to 6VEC- => 0.353 to -0.367VVCA Gain => -55 to +57 dB

Want unity gain at RET CV=4VAt RET CV=4V, VCA Gain=20dBSo R87/R92 = 20dB

At output of U14:AIN at unity gainRET at unity gain (when RET CV=4V)

R86/(R85+R86) = 0.1589

Max level into CODEC is 1V rms = 2.828VppSo total of IN and RET can be up to 17.8Vpp without clipping

D12

1N4148

D13

1N4148

1V rms = 2.82Vpp

10Vpp = 3.536V rms

10Vpp = 3.536V rms +C49

10uF

C50

100pFC0G

R11482KInclude only ifVCA omitted

R11751KShould be 30Kif R114/R115included

IN10

EC+

11EC

-13

OUT 15

SYM

14

U10:B

THAT2162

RET

R93100K

R94100K

R952K

R962K7

R97510R

3

21

84

U16:A

4580

R9820K

R996K8

+15V

-15V

RET CV

5

67

U15:B

TL072

R100510K

R10112K

+15V

-15V

R102100K

-15V

R1032K

+15V

-15V

C54

22pFC0G

IN

5

67

U16:B

4580

+C55

10uF

C56220pFC0G

OUT

RET CV => 0 to 6VEC- => 0.353 to -0.367VVCA Gain => -55 to +57 dB

Want unity gain at RET CV=4VAt RET CV=4V, VCA Gain=20dBSo R87/R92 = 20dB

At output of U14:AIN at unity gainRET at unity gain (when RET CV=4V)

R86/(R85+R86) = 0.1589

Max level into CODEC is 1V rms = 2.828VppSo total of IN and RET can be up to 17.8Vpp without clipping

D15

1N4148

D16

1N4148

1V rms = 2.82Vpp

10Vpp = 3.536V rms

10Vpp = 3.536V rms +C57

10uF

C58

100pFC0G

R11582KInclude only ifVCA omitted

R11851KShould be 30Kif R114/R115included

INR106470R

R10710K

10Vpp = 3.536V rms

+C67

3.3uF

C683.3nFC0G

OUT

1V rms = 2.82Vpp3

21

84

U17:A

4580

+15V

-15V

R1083K9

R109750R

On input side of CODEC attenuation is 0.1589So need output gain of 1/0.1589 = 6.294

R108/109 + 1 = 6.2

Impedance at +ve IP U17:A = 570RImpedance at -ve IP U17:A = 629R

INR110470R

R11110K

10Vpp = 3.536V rms

+C69

3.3uF

C703.3nFC0G

OUT

1V rms = 2.82Vpp5

67

U17:B

4580

+15V

-15V

R1123K9

R113750R

On input side of CODEC attenuation is 0.1589So need output gain of 1/0.1589 = 6.294

R108/109 + 1 = 6.2

Impedance at +ve IP U17:A = 570RImpedance at -ve IP U17:A = 629R

A+3.3V

O

Ia

Ib

R10100K

R11100K

R1330K

R1230K

C14

470pFC0G

-1.65V

3

21

411

U6:A

TLV2264A

R65100R

C2910nFC0G

A+3.3V

OI

R29100K

R3030K

R3130K

C20

470pFC0G

-1.65V

3

21

411

U7:A

TLV2264A

R66100R

C3010nFC0G

A+3.3V

O

Ia

Ib

R17100K

R18100K

R1930K

R2030K

C17

470pFC0G

-1.65V

5

67

U6:B

TLV2264A

R67100R

C3110nFC0G

A+3.3V

O

Ia

Ib

R21100K

R22100K

R2330K

R2430K

C18

470pFC0G

-1.65V

10

98

U6:C

TLV2264A

R68100R

C3210nFC0G

A+3.3V

O

Ia

Ib

R25100K

R26100K

R2730K

R2830K

C19

470pFC0G

-1.65V

12

1314

U6:D

TLV2264A

R69100R

C3310nFC0G

A+3.3V

OI

R32100K

R3330K

R3430K

C21

470pFC0G

-1.65V

5

67

U7:B

TLV2264A

R70100R

C3410nFC0G

A+3.3V

OI

R35100K

R3630K

R3730K

C22

470pFC0G

-1.65V

10

98

U7:C

TLV2264A

R71100R

C3510nFC0G

A+3.3V

OI

R38100K

R3930K

R4030K

C23

470pFC0G

-1.65V

12

1314

U7:D

TLV2264A

R72100R

C3610nFC0G

A+3.3V

OI

R41100K

R4230K

R4330K

C24

470pFC0G

-1.65V

3

21

411

U8:A

TLV2264A

R73100R

C3710nFC0G

A+3.3V

OI

R44100K

R4530K

R4630K

C25

470pFC0G

-1.65V

5

67

U8:B

TLV2264A

R74100R

C3810nFC0G

A+3.3V

OI

R47100K

R4830K

R4930K

C26

470pFC0G

-1.65V

10

98

U8:C

TLV2264A

R75100R

C3910nFC0G

A+3.3V

OI

R50100K

R5130K

R5230K

C27

470pFC0G

-1.65V

12

1314

U8:D

TLV2264A

R76100R

C4010nFC0G