Charger protection relay (CB26312E)

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

12 h timer for Nicad (CB12460E)
This circuit was found in an English publication from 1991. As in that country the power grid is...
4-band photometer (CB8341E)
Obtained in a 1968 Electronics World, this circuit uses transistors from the time and the sensor...
Automatic start for LASER (CB7226E)
This circuit, of a Popular Electronics of 1969 is destined to firing a gas LASER of the time. The...