AC Switch with Triac (CB25855E)

The load controlled by this circuit depends on the triac used. The circuit is from Electronics Now magazine from June 1995.

Pulse Compressor and Expander (CB6658E)
Found in a 1967 Electronic Design, this transistorized circuit compresses and then expands a pulse....
Silencer (CB4197E)
This squelch is activated by its own noise, acting automatically. It is used in communications...
MA1026 Portable Digital Clock and Thermometer (CB24684E)
This is the battery-powered version of the previous circuit. The circuit is from the same Radio...