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
|
|
|
|
|
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 |
|
| |