This circuit is from an American 1964 documentation. Transistors of the time are used, but modern equivalents can be employed.
This control circuit for AC loads with SCR was obtained in a documentation from the 1970s. The SCR...
This circuit produces signals in the range of 200 Hz to 2 kHz. We found it in the magazine...
This sophisticated decade of benchtop resistors was found in the November 1989 issue of Radio...