Final Report Electric Stun Gun

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Text of Final Report Electric Stun Gun

  1. 1. 1 509 ARMY BASE WORKSHOP INDUSTRIAL TRAINING PROJECT PROJECT NAME Electric Stun Gun Submitted to: Submitted by: Commandant & MD Manu Khandelwal 509 Army Base Workshop, Rohit Kumar Agra Kalpagya Goyal Devkaran Piyush Kumar Project done at 509 Army base workshop, Agra {ISO 9001:2008 Certified}
  2. 2. 2 ACKNOWLEDGEMENT We must first of all, express our heartliest gratitude to ARMY BASE WORKSHOP 509 for providing us such a platform for implementing the ideas in our mind and also a special great full thanks to Col. M.C. KUTHARI (OIC GEGP). We would also like to thank Mr. O.P GAUTAM (TCM) who supported us to complete the project, and gave us all the guidance to complete this project. We would also like to thank GE Group for supporting us and providing us the platform to complete this subject. We feel profound pleasure in bringing out this project report for which we have to go from pillar to post to make it reality. Today when our endeavour has reached, we look back in mute gratitude to one and all without whose help, this reality would have remained a dream. 1. Manu Khandelwal 2. Rohit Kumar 3. Piyush Kumar 4. Devkaran 5. Kalpagya Goyal
  3. 3. 3 ABSTRACT Electric stun guns have been developed as less-lethal devices that law enforcement officers can use to control potentially violent subjects, as an alternative to using firearms. These devices apply high voltage, low amperage and pulsatile electric shocks to the subject, which causes involuntary skeletal muscle contraction and renders the subject unable to further resist. In field use of these devices, the electric shock is often applied to the thorax, which raises the issue of cardiac safety of these devices. An important determinant of the cardiac safety of these devices is their electrical output. Here the outputs of three commercially available electric stun guns were evaluated with a resistive load and in a human-sized animal model.
  4. 4. 4 TABLE OF CONTENTS S. No Contents Page No. 1 Acknowledgement 2 2 Abstract 3 3 Table of Contents 4 4 List of Figures 5 5 Introduction 6 6 History of Stun Gun 7 7 Circuit Diagram of Stun Gun 7 8 Principle of Operation 8 9 Description of Material Used in Stun Gun 10 10 11 Timer and Circuit Details Modes of Operation of 555 Timer 17 20 12 Types/Varieties of Stun Gun 23 13 14 15 16 17 Stun Gun Design and Operation Testing and Caution During Operation Advantages & Disadvantages Applications References 25 27 29 30 31
  5. 5. 5 Lists of Figures S. No. Figure Page No. 1 Circuit Diagram of Stun Gun 7 2 Resistor 11 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 Simple Transformer Assembly Symbol of Polar Capacitor Electrolytic Capacitor Symbol of Non-Polar Capacitor Shape of Diode 555 Timer Pins MOSFET Terminals of MOSFET 555 Timer Pin Details of 555 Timer 5555 Timer Pin Connections Standard 555 A-Stable Circuit A Concealable Weapon Shaped and Sized like a lipstick tube Electric Cattle Prod from the 1950s Circuit Diagram of Stun Gun 12 13 13 14 14 15 16 16 17 18 19 21 23 24 25
  6. 6. 6 INTRODUCTION The electric stun gun is a modern, portable, personal-protection appliance. It generates high potential energy to ward off vicious animals or other attackers. It is an aid to help escape from a potentially dangerous situation. The device develops about 200,000 volts. Higher voltages attained by adding additional multiplier stages, but it should be noted that those stage will also increase the overall size of the unit. The stun is very compact, being built into a small plastic case. It is powered by a single 9-volt battery, either NiCad or alkaline. The high voltage is applied to two electrodes which require only light contact to be effective. When touched with the tazer, the victim will receive a stunning, but non- lethal jolt of electricity that will usually discourage any further encounters. The electric stun gun tazer is a power supply which consists of a micro-size regenerative amplifier/oscillator coupled to an energy multiplier section. It should not be confused with a cheap induction-type cattle prods. The tazer is more versatile than other high- voltage stun devices currently being sold. Those devices are basically high-voltage, AC generators which jam the nervous system. However, the tazer may be used for heating and burning applications, or anywhere a high voltage DC supply is required. An electric shock weapon is an incapacitant weapon used for incapacitating a person by administering electric shock aimed at disrupting superficial muscle functions and/or causing pain without significantly hurting the subject. Multiple types of these devices exist differing by the mode of use. Stun guns, batons (or prods), and belts administer an electric shock by direct contact, whereas Tasers (conducted electrical weapons, CEW) fire projectiles that administer the shock through thin flexible wires. Long-range electroshock projectiles, which can be fired from ordinary shotguns and do not need the wires, have been developed as well.
  7. 7. 7 History of Stun Gun Jack Cover, a NASA researcher, began developing the Taser in 1969. By 1974, Cover had completed the device, which he named after his childhood hero Tom Swift ("Thomas A. Swift's electric rifle").The Taser Public Defender used gunpowder as its propellant, which led the Bureau of Alcohol, Tobacco and Firearms to classify it as a firearm in 1976. John Cover's patent was adapted by Nova Technologies in 1983 for the Nova XR-5000, their first non- projectile hand-held style stun gun. The XR-5000 design was widely copied as the source for the compact handheld stun gun used today. Circuit Diagram of Stun Gun Fig.1 Circuit Diagram of Stun Gun
  8. 8. 8 Principle of Operation Electroshock weapon technology uses a temporary high-voltage, low-current electrical discharge to override the body's muscle-triggering mechanisms. The recipient is immobilized via two metal probes connected via wires to the electroshock device. The recipient feels pain, and can be momentarily paralyzed while an electric current is being applied. It is reported that applying electroshock devices to more sensitive parts of the body is even more painful. The maximum effective areas for stun gun usage are upper shoulder, below the rib cage, and the upper hip. High voltages are used, but because most devices use a non-lethal current, death does not usually occur. The resulting "shock" is caused by muscles twitching uncontrollably, appearing as muscle spasms. The internal circuits of most electroshock weapons are fairly simple, based on either an oscillator, resonant circuit (a power inverter), and step-up transformer or a diodecapacitor voltage multiplier to achieve an alternating high-voltage discharge or a continuous direct- current discharge. It may be powered by one or more batteries depending on manufacturer and model. Output voltage is claimed to be in the range of 100 V up to 6 KV; current intensity output is claimed to be in the range of 100 to 500 mA; individual impulse duration is claimed to be in the range of 10 to 100 s (microseconds); frequency of impulse is claimed to be in the range of 2 to 40 Hz; electrical charge delivered is claimed to be in the range of 15 to 500 C (micro-Coulomb); energy delivered is claimed to be in the range of 0.9 to 10J. The output current upon contact with the target will depend on various factors such as target's resistance, skin type, moisture, bodily salinity, clothing, the electroshock weapon's internal circuitry, discharge waveform, and battery conditions. Manufacturers instructions and manuals shipped with the products state that a half-second shock duration will cause intense pain and muscle contractions, startling most people greatly. Two to three seconds will often cause the recipient to become dazed and drop to the ground, and over three seconds will usually completely disorient and drop the recipient for at least several seconds. taser International warns law enforcement agencies that "prolonged or continuous exposure(s) to the taser devices electrical charge" may lead to medical risks such as cumulative exhaustion and breathing impairment.
  9. 9. 9 Because there was no automatic stop on older model Taser guns, many officers have used it repeatedly or for a prolonged period of time, thus potentially contributing to suspects injuries or death. The current X26 model automatically stops five seconds after the trigger is depressed and then the trigger must be depressed again to send another "shock". The trigger can be held down continuously for a longer shock or the device can be switched off before the full five seconds have elapsed.
  10. 10. 10 Description of Material Used in Stun Gun Material Used in Stun Gun 1. 555 timer 2. 8pin chip socket 3. A 9:1000 ferrite core audio transformer 4. 10uF capacitor 5. 0.1uF capacitor 6. 10 x BA159 diodes ( they are faster than the 1N4007, meaning better performance) 7. 10x 3nF, 1200V ceramic capacitors. 8. Neon lamp 9. IRF 530 MOSFET 10. 680Ohm resistor 11. 2kOhm potentiometer (for more accuracy) 12. IR LED 13. 2x 9V batteries 14. Micro switch 15. Printed Circuit Board 16. Connecting wires
  11. 11. 11 Description of Material Used Resistor: The flow of charge (or current) through any material, encounters an opposing force similar in many respect to mechanical friction. This opposing force is called resistance of the material. It is measured in ohms. In some electric circuits resistance is deliberately introduced in the form of the resistor. Resistors are of following types: 1. Wire wound resistors. 2. Carbon resistors. 3. Metal film resistors. Fig.2 Resistor Transformer Transformer works on the principle of mutual inductance. We know that if two coils or windings are placed on the core of iron, and if we pass alternating current in one winding, back emf or induced voltage is produced in the second winding. We know that alternating current always chang