Door Phone Circuit Schematic Diagram


Circuit Schematic Diagram
Description
This circuit can be used in front doors for visitors to communicate or it can be wired up in the front gate for conversation, this circuit is fairly simple but its worth, it dose not use any sought of condenser mic for voice transmission if uses the speaker for both the transmission purpose and for the reception purpose, the heart of the circuit is the operational amplifier LM386 which is used to amplify the voice signal gain adjust is provided by the 5k preset and the pot resistor 10k is used as the volume control.

Source - http://www.electronguide.com/circuits_pages/Doorphonecircuit.html

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