This circuit for cars with mechanical ignition systems was found in the Electronics Experimenter handbook from 1991. It inhibits the ignition system, preventing theft.
This circuit was obtained from the Radio Electronics magazine of October 1960. The circuit uses a...
Found in an Electronics World of 1966, this circuit makes use of FETs of the time. Modern...
Found in a 90s 303 Circuits, this circuit triggers a load from a 50 mV audio signal. When the...