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.
The filter shown in the figure, using only an operational amplifier, is characterized by allowing 1...
Found in a 90s American documentation, this circuit can be used as a shield, just change the...
Found in a Philips' 1968 documentation, this circuit is slightly different from the previous one. The...