Low Impedance Microphone Amplifier
This is the circuit diagram of low impedance microphone amplifier. The circuit designed for use with low impedance (~200 ohm) microphones. It will work with regulated voltages between 6-30VDC. If you don’t build the impedance adapter part with T1, you get a microphone amplifier circuit for higher impedance microphones. In this case, you should directly connect the input signal to C7 (bypass the TI transistor).
Low Impedance Microphone Amplifier Component list:R1=15kC1= 3k9U1= TL081R2= 150kC2= 100uD1= 1N4148R3= 2k2C3= 22uCN1= SIL6R4= 820C4= 4u7R6= 10kC5= 470uR7= 10kC6= 10uP1= 1MC7= 100nC8= 47u UNIPOLAR
PCB layout (bottom):
PCB layout (top-component placement):
Good luck with this low impedance microphone amplifier circuit project