The production principle of high voltage self-defense flashlight and electric stick

The circuit device can output nearly 10,000 volt high voltage pulses for self-defense. It is composed of two triodes and has a large hollow coefficient multivibrator. It outputs pulses to trigger the thyristor 3CT5 to turn on...

The principle of making a self-defense flashlight stick: The circuit device in Figure 1 can output nearly 10,000 volts of high-voltage pulses for self-defense. The entire device is made into a flashlight, which can be used for two purposes.

Circuit principle: BG1, BG2, and B1 form an AC/DC converter. After B1 is boosted, it charges C2 through QL bridge rectification. BG3 and BG4 form a multivibrator with a large hollow coefficient, which outputs pulses to trigger the thyristor 3CT5 to turn on. Capacitor C2 discharges through 3CT5 and the primary of B2, B3, and B4. Therefore, the secondary of B2, B3, and B4 are connected in series to output a high voltage of nearly 10,000 volts. When the function selection switch K is set to position 1, it can be used as a flashlight.

Selection and production of components: For transformer B1, cut two sections of 20mm and 30mm in length from a medium-wave magnetic rod, wrap the coil and glue them into a U-shaped magnetic ring with epoxy resin. See the figure for the data of each winding. It is better to use an E11-shaped magnetic core. B2, B3, and B4 use commercially available XD-type 380V/6.3V indicator light transformers, and use the primary and secondary in reverse. The original 6.3V secondary is connected in parallel as the primary, and the original 380V primary is connected in series as the secondary. When connecting, pay attention to the secondary potential in series, otherwise the output voltage will be insufficient. The β value of BG1 and BG2 should be greater than 60, and the performance should be as close as possible.

Debugging: First adjust the DC-AC converter so that the secondary voltage of B1 is above 200V, and it should not be lower than 160V when connected to a 39k load. After the whole machine is connected, ZD flashes and the high-voltage pulse transformer makes a "pop, pop" sound. Connect the voltmeter E between the positive and negative electrodes of the thyristor, and the maximum swing value of the meter should be close to 150V. The oscillation cycle of the multivibrator should be synchronized with the charging cycle of C2, that is, the pulse of the multivibrator should arrive when C2 is fully charged to trigger the thyristor. This can be achieved by repeatedly adjusting the values ​​of R2, C2, and C3 to take into account each other, so as to synchronize as much as possible to obtain the best output. After adjustment, the high-voltage pulse frequency is between 60-120 times per minute.