This circuit was found in the December 1984 issue of Radio Electronics magazine. The circuit has a control voltage range of -15 to 0 V requiring a symmetrical source.
Found in a 1980s documentation, this circuit works with a 12V relay. The horn is the boat's own. |...
This circuit was found in Delco documentation from 1966. The components are from that time....
This circuit, which can be built with several CMOS gates, was found in the March 1996 issue of...