Circuit Diagram for Full-Duplex Intercom using TDA7052 Audio Power Amplifier IC

The following circuit diagram shows electronics schematic diagram of Full-Duplex Intercom using TDA7052 audio power amplifier IC. The circuit diagram consists of Log. Potentiometer, Resistor, Carbon or Cermet Trimmer, Polyester, Electrolytic Capacitor, Transistor, Audio Power Amplifier, SPST miniature switch, miniature Continue reading

Simple Door Intercom

This intercom circuit suitable for accompanying  door bell. This circuit uses the speakers both as microphones and as loudspeaker. This intercom is made simple by using only a single amplifier IC LM390 to serve two-way communication. This circuit is based Continue reading

Intercom

Below is a 2-station intercom using common 8R mini speakers. The “press-to-talk” switches should have a spring-return so the intercom can never be left ON. Power the speaker from a separate power supply is the secret to preventing instability (motor-boating) Continue reading