Description
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
Parts
| | | | | |
| 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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