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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING High voltage generator (Kirlian apparatus), 220/30000 volts. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Power Supplies This device, which uses a conventional car starter coil, generates a voltage from 5000 to 30000 V. The circuit generates a pulsed high voltage at low frequencies and is suitable for observing or photographing the aura of small objects: coins, leaves, insects, other biological objects, including number of fingertips. Many researchers believe that too low frequencies are not suitable for observing the human aura, and recommend using medium or high frequencies in the range of 2000...10000 Hz. In fact, at very low frequency signals, short-term discharges can occur that can cause a sensation of electric shock. If this happens, replace the glass or plastic plate in the electrode with a thicker one. If you place your finger on the electrodes, tingling and burning sensations are normal. The device is powered by AC power, so care must be taken during operation to avoid electric shock. For safety, an isolation transformer must be used. Attention! Do not touch parts of the operating device if it is connected directly to the AC mains! Always use an isolation transformer. If you are photographing your fingers or palms, always wear rubber-soled shoes. If the feet are in contact with the ground, electrical current flows through the body, which can result in severe electric shock. Replace the glass with a thicker one if you feel like you've been electrocuted. Principle of operation The circuit (Fig. 2.50) consists of a relaxation oscillator using a neon lamp and a silicon thyristor. Capacitors C1 and C2 are charged by the rectified mains voltage through resistor R1 and potentiometer P1. As soon as the voltage on the capacitor C2 reaches the point of ignition of the neon lamp, a current pulse is formed, which is transmitted to the thyristor. The thyristor opens, closing the circuit formed by the capacitor C1 and the high-voltage winding of the ignition coil. Capacitor C1 is discharged through the ignition coil with a high current pulse. In this case, a high voltage pulse is formed on the secondary winding of the ignition coil.
After the discharge of capacitors C1 and C2, the neon lamp is turned off, and the thyristor is locked along with it. A new charge cycle begins, and the described process is repeated. The time cycle of charge and discharge can be adjusted by potentiometer P1. At the values specified in this project, the oscillator operates at frequencies between 100 and 1000 Hz. By reducing the values of capacitors C1 and C2 to 1 μF and 0,047 μF, you can increase the frequency, however, in this case, the output power of the circuit will decrease. The high voltage induced in the ignition coil depends on the voltage to which capacitor C1 is charged. By increasing the voltage across the capacitor, the output voltage can be raised from 4000 to 30000 V and higher. Since the currents in the secondary winding of the ignition coil are very small, the high voltage generated is not life-threatening, although it can cause a strong shock if the coil is touched. Note that the device in question is not AC isolated. This means that the generator should be used with extreme caution. For safer operation, it is recommended to connect an isolating transformer. Assembly The list of elements is presented in table. 2.12. Table 2.12. Item List
Resistor R1 - wire. Its value can be changed depending on the voltage in the AC network. The values in parentheses are given for the mains with a voltage of 220 ... 240 V. The electrolytic capacitor C1 must be from 2 to 16 microfarads. It determines the amount of energy transferred to the ignition coil with each pulse and therefore also determines the power output of the device. In this project, you can use ignition coils that are commonly used in a car. Any type will do - the only difference between such coils is the value of the output voltage, which can vary over a wide range. The thyristor must be mounted on a small radiator, the role of which will be played by an ordinary metal plate. The type of thyristor should be selected so that it is able to withstand the amplitude of the mains voltage. When powered from a 117 V mains, it is necessary to use an electrolytic or metal-film capacitor with a rated voltage of at least 1 V as C250. If the circuit is powered from a 220 or 240 V mains, the operating voltage of the capacitor must be at least 400 V. The circuit should be placed in a plastic case to avoid electric shock. The metal case cannot be used. As a T1 transformer, any isolating transformer with a winding ratio of 1: 1, designed to work from your network, is suitable. The power of the transformer must be at least 20 watts. Attention! Check the resistance values between the windings - for safe operation of the circuit, it must be at least 2 MΩ. Keep the above precautions in mind to ensure safe use of the device. Author: N.S.Braga
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Comments on the article: Vasya He took a glass - it shocks, he took another glass - it still beats. Sergei Well done. Nice and simple diagram.
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