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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11 Meter modulation indicator (CB5355E)
We found this circuit in an ancient American documentation. It can be adapted to operate in other...
Audio controlled switch (CB8435E)
Found in a 90s Popular Electronics, this circuit triggers a load from the audio signal applied to...
Neon Divider (CB6835E)
Found in ancient American documentation, this circuit produces a pulse every 8 Hz of a 400 Hz...