Intercom circuit diagrams

Room Monitor

This circuit allows audio monitoring of a remote location and so doubles as a room monitor or baby alarm.

Doorphone Intercom

A simple Intercom made with a single transistor and low power audio amplifier LM386. The circui uses 8 ohm speakers, which also double as a microphone.

High Quality Intercom

A very high quality intercom, which may also be used for room monitoring.