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Diagram of a communication device based on the integral amplifier LM386
In the scheme uses two 8 Ohm speaker, which works as a microphone and as a speaker. The potentiometer is used to adjust the device volume. Two position switch is used to switch between the speakers: if one is included as a microphone, the second works as a speaker and Vice versa.
Powered circuit from the batteries of the crown 9 In, or power supply.
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