This circuit with the CA3059 was found in the July 1995 Elexctronics Now magazine. The signal must be DC, and the circuit is not isolated from the mains.
This source for devices for automotive use was found in a 1985 documentation. The power...
This circuit was found in a Japanese documentation of the 70's. It uses transistors of the era and is...
This circuit was found in a 1992 documentation but uses discrete components that can still be...