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.
The component used in this circuit that we found in an old documentation, is not easy to obtain...
This circuit was obtained in an old Linear Technology documentation by applying to the monitoring of...
The circuit presented was found in a European publication of the 1980s. Used transistors are not...