This power control for powers up to about 10 W uses wire potentiometers in an arrangement that allows to maintain the impedance. The circuit is from old European documentation.
This circuit is from a 1976 documentation. It provides a pulsating DC voltage that can be varied...
The presented circuit triggers the relay when S is pressed for an instant, keeping it in these...
This circuit is from a Radio Electronics from October 1963. The LDR and transistors are from the...