Audio006

                                          

Low Impedance Microphone Amplifier
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Schematic design of Low impedance microphone amplifier
Part Components of Microphone Amplifier:
Capacitors	Resistors
C1      = Not used C2      = 100 μF / 25V Electrolytic C3      =   22 μF / 25V Electrolytic C4      =  4.7 μF / 25V Electrolytic C5      = 470 μF / 25V Electrolytic C6      =   10 μF / 25V Electrolytic C7      = 100 nF  C8      =   47 μF Unipolar Semiconductors U1      = TL081 D1      = 1N4148	R1      =   15KΩ ¼W R2      = 150KΩ ¼W R3      =   2K2Ω ¼W R4      =    820Ω ¼W R5      =    820Ω ¼W R6,R7 =    10KΩ ¼W R8      =    3K9Ω ¼W  P1      =     1MΩ Log.Potentiometer Others CN1    = SIL6
Notes
The circuit is a microphone amplifier for use with low impedance (~200 Ω) microphones. It will work with stabilized voltages between 6-30 VDC. 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.
Component Layout :	PCB Layout :

Source : Electronics Lab