We can use this circuit to connect low impedance microphones and even small speakers used as a microphone, to the input of amplifiers that do not have the resources to work with these devices. The circuit amplifies the signal and delivers it with intensity to excite the input of common amplifiers. The circuit has a very low consumption and can be powered by a battery. The level of the output signal for correct excitation of the amplifier is adjusted in a potentiometer.
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