This automotive circuit was found in the September 1992 issue of Radio Electronics magazine. The circuit directly drives a relay that must have a coil resistance greater than 65 ohms.
This circuit for cars with mechanical ignition systems was found in the Electronics Experimenter handbook...
This code practice circuit was found in a 1990s issue of Radio Amaterur Today magazine. It...
The circuit presented was found in the Linear Applications Handbook of the National Semiconductoir of 1994....