BC549C and BC547B Microphone amplifier

BC549C and BC547B microphone general description:

The preamplifier amplifies the output signal of a microphone, so that it can be. The further amplified by a power amplifier The circuit supplies the output to a signal line. With two transistors, it is not difficult to build such a circuit. The amplifier produces little noise. In the shown embodiment, the circuit is suitable for microphones 500 and 600 Ω. 200 Ω R1 microphones should be reduces to 220 Ω and C1 should be increased to 4.7 uF. The gain is set by R2. If the average declared value of 22 K? Can be used. The maximum gain is about 200 times.

BC549C and BC547B microphone circuit:

BC549C and BC547B microphone part list:

R1 = 470 Ω
R 2 = 22 K?
R3 = 12 K?
R4 = 47 k
R5 = 820 Ω
R6 = 100 Ω
R7 = 1 k
R8 = 100 k
C1, C4 = 2.2 V μF/16
C2 = 47 V μF/16
C3 = 470 nF
T1 = BC 549C
T2 = BC 547B