BTEC NC - Electronics - Software Simulation of Analogue and Digital Circuits

8/2/2019 BTEC NC - Electronics - Software Simulation of Analogue and Digital Circuits

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Brendan Burr BTEC National Certificate in ElectronicsSoftware Simulation of Analogue & Digital Circuits

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Task 1

ELEX 2A323.1

3.2Input Output Function

B A F1 F2 F3 F4 F5 F6 F7

0 0 1 1 0 0 1 0 1

0 1 1 0 0 1 0 1 0

1 0 1 - 0 1 0 1 0

1 1 0 - 1 1 0 0 1

3.3Output

FunctionLogic

Function

F1 NAND

F2 NOT

F3 AND

F4 OR

F5 NOR

F6 EX-OR

F7 EX-NOR

3.4

NAND Gate Chip Number 74HC00N

Logic Family TTL

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Task 2

ELEX 4B25

5.1R1 = 6K8 R2 = 4K7 C1 = 1F C2 = 1F

5.3Waveform at pin 6 - Test Point A Measured from cro

Maximum Voltage Level (Volts) 6V

Minimum Voltage Level (Volts) 3V

Peak to Peak Voltage Level (Volts) 3V

Waveform at the output pin 3 Measured from cro

Maximum Voltage Level (Volts) 9V

Minimum Voltage Level (Volts) 0VTime Period in secs of High Level [Mark] (t1) 8mS

Time Period in secs of Low Level [Space](t2) 3mS

Periodic Time in secs (T) 11mS

Frequency in Hz (f) 90.91Hz

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Measured from cro

Maximum voltage at pin 3 6V

Minimum voltage at pin 3 3V

Calculated from aboveRatio of maximum voltage at pin 6 / Vcc 2:3

Ratio of minimum voltage at pin 6 / Vcc 1:3

6.1 Measured Calculated

Mark time t1 (secs) 0.008 0.00805

Space time t2 (secs) 0.003 0.00329

Periodic time T (secs) 0.011 0.01134

M.S.R 2.7 : 1 2.44 : 1

Duty cycle % 0.727 0.7099

Frequency (Hz) 90.91 89.506

( )

( )

00805.0

101470068007.0

7.0

1

6

1

1211

=

+=

+=

t

t

CRRt

00329.0

10147007.0

7.0

2

6

2

122

=

=

=

t

t

CRt

1:4468.2..

00329.0

00805.0..

1:..

2

1

=

=

=

RSM

RSM

t

tRSM

( )( )

( )( )

01134.0

1014700268007.0

27.0

6

121

=

+=

+=

T

T

T

P

P

CRRP

( )( )

( )( )

Hzf

f

CRRf

50617284.89

101470026800

45.1

2

45.1

6

121

=

+

=

+

=

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7.1Explain the difference if any, between your calculated values andmeasured values.

It is difficult to read the graph precisely, so the inaccuracies have

most likely come from this limitation.

7.2What happens when pin 4 is connected to 0V?

Due to pin 4 being the reset, it is impossible to reset the chip. Thisresults in no cycles and therefore the chip stays at a continuous 0V.

7.3What happens to the frequency when C1 is decreased in an astablecircuit?

The frequency increases whenever the capacitor C1 is decreased.

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Task 3

ELEX 2A30

Voltage at the collector or TR1 3.66V

Voltage at the base of TR2 -1.04VVoltage at the collector or TR3 0.88V

Voltage at the base of TR3 0.52V

Potential difference across R3 8.99V

Current drawn from the DC supply by the circuit 7.50mA

Peak to peak voltage at collector of TR1 8 Volts

Periodic Time 3.1 x 10-3

Mark to Space ratio 1:1

Calculated Frequency 328.94 Hz

Measured Frequency 322.58 Hz

5.3.3

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5.3.5

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5.3.7

5.3.10Frequency of waveform at thecollector at TR3

625Hz

Mark to Space Ratio at thewaveform at the collector ofTR3

16:1

Frequency:

14

1:6

0625.0

10625.

0625.0

600

00

1

=

S

S

( )Hz

PT

625

105002.3

1

1

6

=

=

Documents

BTEC NC - Electronics - Software Simulation of Analogue and Digital Circuits