THE DEVICE STUN GUN IS NOT A TOY. It is being presented here for the educational and experimental purpose only. Nevertheless extreme precaution should have to be taken care into account as its output develops about 25,000 volts. The output is pulsed and not continuous. But it may effect serious pain in case of careless handling. Therefore, anybody should never use to any other person. Prior to use it as a self-defense equipment prior permission should have to be taken from the appropriate authority otherwise may be liable for civil action.
CONSTRUCTION OF THE STUN GUN: Please keep in mind that the STUN GUN produces dangerously high voltage, extreme precautions should have to be taken at the time of construction. First of all the assembly must be done on at least 1.5mm thick Glass Epoxy PCB. All the components must be soldered properly. The transformers (T1 and T2) will not be mounted on the PCB.
As the three transformer is critical enough, detail turns of winding is not been provided with this document. Assemble all components on the PCB except C3, T1 and T2.
While measuring the voltage and currents a safe distance should be maintained from the high voltage end i.e. C3, T1 and T2. Any metallic tool and/or moist items and/or hand / face etc. may act as a discharge path of the high voltage. Therefore, maximum precaution should be taken care of accordingly.
Connect a multimeter with a set range of 1000V DC to ground and D1-D4 Diode Bridge. Then power on the unit with a fresh 9V battery. If everything working properly 400V DC shall be available at the point of D2, D4 and D5 junction. 100 micro-second square-wave pulse may be measured at the collector of TR2 & TR3 using an oscilloscope. If that waveform is not present be sure that switching circuit is not function properly. Resistor R2 controls the rate at which TR1 (UJT) discharges and resistor R8 controls the rate at which C3 discharges. In some cases resistor R8 can be adjusted between 2.2 K ohms to 4.7 K ohms to achieve 400V properly. When the circuit working properly ensuring that there shall not be any spark within the circuit board.
On completion of the above steps place the charger input socket using high voltage potting compound prior to set into the enclosure. The enclosure should be made of plastic or acrylic materials. When the unit will not been in use remove the battery before storing. Over and above Please be careful.