Charger protection relay (CB26312E)

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

Low Input Current Fast Adder (CB14126E)
We found this circuit in the 1994 Linear Applications Handbook from National Semiconductor. The...
16 W Amplifier (CB6168E)
This circuit is from an Electronics World of 1968. The transistors are of the time and the power...
Remote Control Tester (CB25561E)
This circuit checks the infrared emission of a common remote control. We found it in the March 1993...