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.
R1=15k- R2= 150k
- R3= 2k2
- R4= 820
- R6= 10k
- R7= 10k
- P1= 1M
- C1= 3k9
- C2= 100u
- C3= 22u
- C4= 4u7
- C5= 470u
- C6= 10u
- C7= 100n
- C8= 47u UNIPOLAR
- D1= 1N4148
- U1= TL081
- CN1= SIL6
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