Found in the September 1972 issue of Radio Electronics magazine, this signal injector is based on the HEP580. The circuit is powered by two batteries and its frequency is basically given by C1.
Incandescent lamps, heaters and other resistive loads can be controlled by this circuit whose...
This is a commercial circuit from a Japanese publication from 1972. The circuit uses a FET that...
Using a 4N33 optical coupler, we have in the figure an optical interface for TRTL circuits,...