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Basic Electronics for Tomorrow's Inventors by Nick Dossis

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CHAPTER 7
Can We Talk? Build a Working Telephone
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ONE VERY IMPORTANT FEATURE of a mobile telephone is that it allows you to talk to someone! If you have read Chapter 4, you will realize that a mobile phone contains an earpiece, which allows you to listen to the other person, and a microphone, which allows your voice to be converted into an electronic signal that can be heard by the person on the other end of the phone.
This chapter’s Experiment 4 shows you how to create a basic telephone by using a few components and a microphone and earpiece. Two of these circuits are then combined on a single piece of breadboard so that you can have a two-way ...

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