This QST circuit generates 4 frequency signals according to the crystals used. Transistors admit equivalents although the indicated types can still be found with some ease.
This vox was found in Hughes documentation from 1968. The circuit uses components from the era. A...
This circuit was found in the February 1992 Radio Electronics magazine. The circuit drives 5 LEDs...
Found in a 90’s Electronic Engineering, this circuit tests the three phases of such a supply. The...