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Alarms & Security Related Schematics and Tutorials

Low Impedance Microphone Amplifier Circuit

Low impedance microphone amplifier

Description

The circuit is a microphone amplifier for use with low impedance (~200 ohm) microphones. It will work with stabilized voltages between 9-30VDC. If you don't build the impedance adapter part with T1, you get a micamp for higher impedance microphones. In this case, you should directly connect the signal to C7.

Schematic diagram

Schematic diagram

 

Layout of board

Layout of board Diagram


Printed PCB

Printed PCB Diagram


Components

Name

Value

R1

15k

R2

150k

R3

2k2

R4

820

R5

680

R6

10k

R7

10k

P1

1M

Name

Value

C1

3k9

C2

100u

C3

22u

C4

4u7

C5

470u

C6

10u

C7

100n

C8

47u UNIPOLAR

Name

Value

U1

TL081

D1

1N4148

T1

BC109

CN1

SIL6

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