This circuit is from a 1968 Electronics World. It acts directly on a high voltage alternating current relay. The sensor can be a common LDR.
November 2016 - The On Semiconductor Reference Development Kit and WDK1.0GEVK Reference Kit can...
We find this circuit in an American 80's documentation. No further information about the...
The circuit shown in the figure is in fact an excellent symmetrical switching source capable of...