Three-phase power supply (CB23680E)

This circuit was found in Radio Electronics magazine from July 1960. The components used are transistors of the time.

JFET Sample and Hold (CB5955E)
The operational amplifier is old. The circuit is from an 80's documentation but can be designed...
Multiple delay pulse generator (CB8200E)
This configuration, explored in other applications of this section and website, was found in a 90s...
Rain Indicator (CB12392E)
The sensors can be screens having porous tissue between them. When the water moistens them, the...