intercom circuit with transistors

Posted on Feb 5, 2014

The secret to preventing instability (motor-boating) with a high gain circuit like this is to power the speaker from a separate power supply! You can connect an extra station (or two extra stations) to this circuit design. Build the circuit into two separated boxes (for 2 stations). On each box should be use 2 ports for external power supply port

intercom circuit with transistors
Click here to download the full size of the above Circuit.

(if you use external power supply, not battery) and connection port to other stations. Create some holes for speaker push on switch.

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