Charger protection relay (CB26312E)

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

Stepper Motor Drive (CB21490E)
This circuit was found in a 1967 Electronic Design. The circuit makes use of components from the...
Light Operated Switch (CB24966E)
Using the CA3140 integrated circuit, this switch was found in the June 1986 Radio Electronics...
Clock alarm timer (CB21290E)
Found in Popular Electronics from the 90's, this circuit uses common components and can be easily...