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A one IC circuit to test microphone and earphone of aero and PC headset. With a switch, you can choose a tone generator or the microphone as an input. You can adjust the mic gain, as well as the earphone gain. Very easy to wire, only few components.

A one IC circuit to test microphone and earphone of aero and PC headset. With a switch, you can choose a tone generator or the microphone as an input. You can adjust the mic gain, as well as the earphone gain. Very easy to wire, only few components.