Triac activated switch (CB9088E)

This circuit is from an 80's Radio Electronics. It triggers a load powered by the power grid from the audio signal captured by the microphone.

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Divider with SUS (CB6819E)
This frequency divider with SUS was found in General Electric's 1967 documentation. Similar...
Pre Amplifier For Crystal Microphone With 741 (CB924E)
The configuration of this circuit was suggested by an old English publication that comes to...
Limit Detector (CB5163E)
This two-input limit detector was found in an American 1980s documentation. The circuit can be...