Described in the December 1969 Radio Electronics magazine, this circuit is intended to supply the previous circuit. The circuit is not isolated from the power grid.
Found in an Electronic Design from the 90's, this circuit uses an SCR according to the controlled power....
This circuit was found in an English publication from 1967. The circuit is for listening on a...
This is the traditional configuration of an OR gate using a voltage comparator, but it can also be...