Intercom Circuits
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Wiring 2-Wire Intercom. According to Wikipedia, an intercom is a stand-alone electronic communications system intended for limited or private dialogue....
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This circuit consists of two identical intercom units. Each unit contains a power supply, microphone preamplifier, audio amplifier and a Push To Talk (PTT) relay circuit. Only 2 wires are required to connect the units together. Due to the low output....