We found this circuit in a 1967’s Electronics World. The circuit can be made with modern equivalent transistors. The selection is made by the tuned coil.
This circuit is intended for charging 12 V Nicad batteries, which corresponds to 10 common...
This circuit for discharging NiCad batteries limits the current to a value that can be adjusted in the...
This current-limited circuit was found in a Popular Electronics from the 90's. ...