Battery Charger (CB26303E)

This automatic battery charger was found in a Popular Electronics from the 90s. The circuit uses a relay for automatic shutdown.

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4-Digit Digital Multimeter (CB24735E)
We found this circuit in the February 1983 issue of Radio Electronics magazine. The 4-digit...
Voltage Controlled Resistor (CB5347E)
We found this circuit in an old American documentation. It is an electronic rheostat with a...
Curve Plotter (CB18787E)
With this circuit it is possible to trace the characteristic curve of a component using an...