Charger protection relay (CB26312E)

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

Gated Oscillator (I) (CB104)
The gated oscillator shown here turns on when a “1" Iogic Ievel is applied to the input. The...
Octave Generator (CB8008E)
Found in a 90’s Radio Electronics, this circuit uses a component from the time, difficult to find today....
Long Timing for the 555 (CB4575E)
In the figure we have a circuit where two 555 operating one as astable and the other as monostable...