This is the circuit diagram of low impedance mic preamplifier built based TL081. The circuit is 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 mic preamp for higher impedance microphones. In this case, you should directly connect the signal to C7.
Components List:
| 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 |
Bottom PCB Layout (chopper side):
Top PCB Layout (components side):
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