Low Impedance Microphone Amplifier

Low Impedance Microphone Amplifier circuit diagram
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=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

PCB layout (bottom):

Low Impedance Microphone Amplifier bottom pcb layout

PCB layout (top-component placement):

Low Impedance Microphone Amplifier top pcb layout

Good luck with this low impedance microphone amplifier circuit project 🙂

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