This electronic defense generates a high voltage discharge capable of intimidating an attacker. The circuit was found in the Radio Electronics Experimenter magazine special edition of 1990.
This control circuit or reversible contactor was found in a 1967 General Electric manual. The...
We found this circuit in a 1987 publication. Through a relay, it controls water valve solenoids at several...
The figure shows how to use a varicap in a conventional tuning circuit. The circuit may be an...