Can someone please give a detailed explanation of the working of this 2 way intercom ? The mic for the top speaker is between the 1M and 33 ohm resistors and the mic for the bottom left speaker is at the node just below the top speaker.
No.AG, I have no idea what elementary schools you attended, but standard intercoms do use the speaker for dual duty. Sometimes you get so into your avatar namesake you forget to do a reality check. Intercoms are not high (or even medium) fidelity systems.
No.AG has shown a half duplex type that can be upgraded. Basically it is very similar to telephone circuitry.
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