We found this circuit for immobilizing a car's ignition system in the December 1976 Radio Electronics magazine. The circuit uses the courtesy light activation switches.
This circuit can modulate a laser rate at frequencies of 50 kHz. We found the old documentation. The bipolar...
This circuit was found in the May 1984 issue of Radio Electronics magazine. It analyzes the...
This circuit can be used as a signal when powered by a car battery, as it also works with 12 V, or...