Charger protection relay (CB26312E)

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

CMOS Siren (CB26157E)
Found in the 1991 Electronics Experimenter Handbook magazine, this circuit has good power and is...
Turning Linear Potentiometer into Log with the 741 (CB12179E)
This circuit changes the actuation curve of a 47k or 50k linear potentiometer so that it becomes...
One second with Accuracy (CB1536E )
This circuit was found in a 1977 Radio Shack documentation. Its purpose is to generate 1 Hz...