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