Microphone balanced amplifier (CB9388E)

This circuit was found in an old American documentation. The integrated circuit used is uncommon today.

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Field strength meter (CB7356E)
This untuned circuit uses one of the world's first commercial transistors, the CK722, having been...
RF proximity sensor (CB8765E)
This capacitive sensor that operates with a high frequency oscillator was found in Radio...
3-Gate Triggered Oscillator (CB25332E)
Using 3 ports, this rectangular oscillator was found in the March 1996 issue of Electronics Now...