Telephone Intercom Circuit Diagram

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Two way intercom circuit diagram using transistors and UM66 as ringer

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Two way intercom circuit diagram using transistors and um66 as ringer

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Simple Intercom Circuit

Two way intercom circuit diagram using transistors and UM66 as ringer

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Full-duplex Intercom Circuit Diagram

2 phone Intercom circuit diagram which can be used upto 1km in outdoor

Doorphone Intercom - Electronic Schematic Diagram