This circuit can be used to test crystals from 1 to 20 MHz and also has an output to measure their frequency. We found it in the November 1998 Electronics Now magazine.
This 1-transistor oscillator circuit was found in the March 1965 Radio Electronics magazine. The...
This circuit shows how to control a power load using a low current switch. The circuit is half...
This circuit shows how it is possible to control 9 loads with only 6 Triacs using the matrix...