The Intercom project is just an amplifier that plays sounds out of speaker at another location.

The switch is a double throw which at the same time switches the speaker from the amplifier output to the pre-amp input. There is no microphone. One of the knobs is a pot used for volume control and the other is a multi-position rotating switch to direct the signal to the desired room.

The case was build out of bent plastic and the speaker grill was formed by pressing it out of metal.

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