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.
Using two unijunction transistors, this circuit found in Electronics World generates linear...
The basis of this circuit is the 723 integrated circuit, not very common today. We obtained this...
This circuit was found in a 2006 publication. It uses discrete components and CMOS that are still...