Posted on Sep 9, 2012

The circuit provides a minimum component intercom. With switch SI in the talk position, the speaker of the master station acts as the microphone with the aid of step-up transformer Tl. A turns ratio of 25 and a device gain of 50 allows a maximum loop gain of 1250. Rv provides a common mode volume control

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Switching Si to the listen position reverses the role of the master and remote speakers.

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