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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.


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    
    C8= 47u UNIPOLAR    

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