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.
Suggested by Philips documentation from 1968, this circuit uses components from the era that can...
This 13.6 V x 15 A power supply was found in a 1997 documentation. It is suitable for powering...
Using a dual 555 CMOS this very useful circuit on the bench was found in the July 1998 Electronics Now...