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Brief description of the drawings
FIG. 1 is a circuit diagram showing one example of a conventional microphone signal amplifier
circuit, FIG. 2 is a circuit diagram showing one embodiment of a microphone signal amplifier
circuit according to the present invention, and FIG. 3 is another embodiment of the present
invention. It is a circuit diagram shown. 1 ... 1st amplifier, 2 ... 2nd amplifier, 3 '... 1st microphone
jack, 4 ... 2nd microphone jack, L ... 1st input terminal, R ... second input terminal, SW ... switch.