Three-phase converter (CB21931E)

This circuit was found in the RCA Power Transistor manual from the 70's. The circuit uses power transistors of the time.

Photoelectric Flasher (CB1303E)
When the illumination decreases, this multivibrator starts up, causing the lamp to blink at a...
CMOS Zero Crossing Detector (CB20625E)
The operation of this circuit is old, but the configuration can be elaborated based on modern...
Automatic light (CB22105E)
This circuit activates an incandescent lamp when the light stops falling on the sensor. The...