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In this project, I show you how you can make a simple intercom system from a pair of old corded telephones. The phones already have all the circuitry that is needed for processing a voice call. All you need to add is a 9 volt battery and a resistor. This is an easy electronics project for beginners and it is great to do with children. Try it out and have fun. Find more at the Maker Shed: Make: Electronics, 3rd Edition: Here’s the full build on MAKE: Projects-- and on Instructables:
