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 output transistors of this circuit can be TIP31 and TIP32. The other transistors admit...
This oscillator with crystal for overtone operation was found in an old American documentation. The coil...
Old multimeters used a 22.5 V battery for high resistance measurements. If you have one, you...