The figure shows how to couple two TTL circuits using an optical coupler to obtain isolation. The circuit is shown in the August 1992 issue of Radio Electronics magazine.
This SCR circuit was found in an American 1980s documentation. The circuit is still current,...
This configuration, found in other circuits on this site, was obtained in an English publication from...
This circuit, which controls both the temperature and the level of a liquid in a reservoir, was...