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Schematic

Layout

3D View

MCP4231

Frequency read

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10

Voltmeter GPIO 27, Ohm meter GPIO 26

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7

Positive side

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2

Square amplification and centering

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8

Rail splitter

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1

Voltmeter and DC Reference Circuit

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5

Negative side

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3

Ohm meter Comparator circuit

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6

Sine Frequency control

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9

R3

Resistance

10 Ω

R16

Resistance

1000 Ω

R14

Resistance

27000 Ω

R1

Resistance

4700 Ω

R12

Resistance

1000 Ω

R23

Resistance

10 Ω

R9

Resistance

1000 Ω

R2

Resistance

4700 Ω

R20

Resistance

810 Ω

R4

Resistance

10 Ω

R11

Resistance

1000 Ω

R7

Resistance

1000 Ω

R25

Resistance

850 Ω

R8

Resistance

1000 Ω

R10

Resistance

1000 Ω

R13

Resistance

110 Ω

R5

Resistance

10 Ω

R19

Resistance

2200 Ω

R24

Resistance

42000 Ω

R6

Resistance

10 Ω

R17

Resistance

100 Ω

R15

Resistance

3100 Ω

R21

Resistance

5000 Ω

R22

Resistance

10 Ω

C4

Capacitance

3nF

Capacitance

Q1

12nF

Capacitance

C2

Capacitance

C3

Capacitance

12nF

Capacitance

3nF

Capacitance

LM324N

Q2

C1

Capacitance

12 V

D1

MCP4131

D4

D3

DC Reference

D2

Voltmeter

LM339

Ohm meter

Raspberry pi 4

TL084

Final 2.0