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Bear in mind, before this there was a mechanical repeater as well, which was a transmitter and receiver which were mechanically coupled.

A carbon mic is somewhat self-exciting and does provide an amplification factor.



Aha! For some reason I had it in my mind that early telephones were moving coil type, and the carbon mic came along later. You're absolutely correct - thanks for setting me right.


Its really an ingenious device, I've wanted to build one, just because I'm a phone nerd, think its cool.




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