Charger protection relay (CB26312E)

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

Locked Triac Switch (CB12241E)
This circuit, which applies to configurations with triacs of the TIC series, was found in a...
Modulated siren 555 (CB8651E)
This configuration can be found elsewhere on this website and section. The circuit is from Popular...
Alarm with lock (CB8973E)
The basic component of this circuit is a general-purpose SCR. The voltage is according to the...