Mini intercom by one ic op-amp

This is mini size intercom circuit. It uses IC Op-amp number LM380 just one as a result can work already. When switch S1 stay in a position speaks loud show in circuit picture. The loudspeaker of mother station will perform to is microphone for drive op-amp. By change step up transformer or T1. The switch of child station will must is in a position listens. The voltage of power supply stay in 8-20Volt sections.

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