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.
I found this simple circuit from an English magazine from 1984. The circuit can be easily...
This small signal injector generator was found in the February 1971 issue of Radio Electronics magazine....
Found in American documentation from the 1980s, this circuit makes use of components that...