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This is a great intercom circuit that can be used in many ways. It uses 22V to operate and maybe it will work at a lower voltage (you can try it). For input/output it uses a loundspeaker (20-45 Ohm) on each side.

Click to enlarge

Componets Layout

PCB

Parts List

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See here how the SW should be. See also the large theoritical image.

Title: Intercommunication (Intercom)
Source: www.electronics-lab.com
Published on: 2005-02-10
Reads: 758
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