This circuit, with printed circuit board included, is from a Radio Electronics magazine from July 1971. The SCR can be any equivalent of the 106 series.
The great advantage of the circuit shown in the figure is the fact that its frequency is...
This power supply provides a12 V stabilized output. The transistor must be provided with a good...
Found in an American publication from 1968, this circuit can be made based on a TIP42 that must be...