Charger protection relay (CB26312E)

This circuit was obtained from an Elektor magazine from the 90s. The circuit is to protect batteries while charging.

Triggered light source (CB7197E)
This circuit is from a 1968 General Electric manual. It produces a pulse of light when fired,...
Fuzz effect (CB22080E)
This simple guitar distortion effect was found in a documentation from the 90's. The circuit is...
Diode Test with Oscilloscope (CB4160E)
The circuit shown enables dynamic diode testing with an oscilloscope. We found this configuration in a...