Charger protection relay (CB26312E)

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

Turntable Circuit (CB24357E)
This is the circuit of a turntable from the 1970s. We found it in a repair article in the December...
24 Hour Clock (CB6462E)
This circuit divides the grid 60 Hz frequency to obtain 20 Hz to drive mechanical watches used at...
Audio Amplifier CA3080 (CB20022E)
This small audio amplifier uses an uncommon integrated circuit today. The circuit is from a...