This site introduces the principle of a commercial electric shock device, which is small in size and can generate a high voltage of over 40,000 volts with a 7.2V power supply, making it very suitable for self-defense. Electronics enthusiasts can refer to this for production.
The circuit schematic is as follows:
T1 and T2 along with peripheral components form an oscillator, generating a DC pulse voltage of about 10Hz. This pulse voltage is amplified by T3 for driving, and finally enters T4 for power amplification, producing a high-current pulse voltage in the primary coil of the step-up transformer B, which is then stepped up to generate a high voltage of over 40,000 volts on the secondary side.
The circuit of this electric shock device is simple and clear. As long as the following requirements are met during production, success is easy. T1 is a PNP transistor, requiring B≥150, and can be 9015, 8550, etc.; T2 and T3 are NPN transistors, requiring B≥130, and can be 9014, 9011, etc.; T4 is an NPN high-power transistor, with B≥25 sufficient, preferably Motorola's MJE13005, whose heat sink is connected to the C pole. All resistors use 1/8W carbon film resistors. Capacitors are small-sized. K is a small push-button switch. The step-up transformer can be purchased as a high-voltage rod head from a finished electric baton, or use the flyback transformer from a black-and-white TV. Batteries use nickel-cadmium or nickel-metal hydride batteries to increase power; to reduce size, AAA batteries are best.
During production, assemble the components as shown in the figure below. Pay attention to your own safety during testing. If after powering on, pressing K causes high-voltage sparking at the discharge end of the transformer, it indicates success.
