9V Telephone Project

9 Volt, Battery Powered, Telephone Intercom System

When I was developing the VoIP Fundamentals course, I wanted a demonstration to illustrate the simplicity of the public switched telephone network. After combing through the internet, I came across this ingenious little¬†project. With just a 9V battery, a resistor, a telephone cord, and a couple of phones you can create a simple little intercom …

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