Low impedance microphone amplifier
Electronic Schematics > Audio > Low impedance microphone amplifier


The circuit is a microphone amplifier for use with low impedance (~200 ohm) microphones. It will work with stabilized voltages between 6-30VDC. 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.

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Schematic diagram

Layout of board

printed PCB


R1=15k C1= 3k9 U1= TL081
R2= 150k C2= 100u D1= 1N4148
R3= 2k2 C3= 22u CN1= SIL6
R4= 820 C4= 4u7
R6= 10k C5= 470u
R7= 10k C6= 10u
P1= 1M C7= 100n

Title: Low impedance microphone amplifier
electronic circuit
Source: www.electronics-lab.com
Published on: 2005-02-01
Reads: 1028
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Electronic circuits > Audio > Low impedance microphone amplifier