Charger protection relay (CB26312E)

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

Two Time Traffic Light (CB16523E)
We found this circuit in a 1998 documentation. It is based entirely on relays that must have...
20 Wrms Transistor Amplifier (CB17226E)
This traditional complementary symmetry circuit provides 20 W of rms power at a load of 8 ohms...
Micro Spy (CB21872E)
Assembled with SMD components this circuit can be very small. The range is a few tens of meters. We...