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 Japanese radio is from the 60s, presenting excellent sensitivity and an output power of 100mW...
Found in a Popular Electronics from the 90s, this circuit uses components that are still current....
This circuit consists of a simple capacitance bridge. The handset can be high impedance from 500...