Electric lighter for gas. Encyclopedia of radio electronics and electrical engineering
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The magazines contain many schemes for self-manufacturing devices similar to their intended purpose, however, as experience shows, the greatest difficulty in the manufacture of such devices is winding a high-voltage coil so that there is no breakdown inside it, as well as making a beautiful case. The following diagram and design easily solves these problems.
Rice. 1.24 (click to enlarge)
The electrical circuit (Fig. 1.24) contains only unified and easily accessible parts, including the T2 high-voltage coil, which is used as a line-scan transformer from TVS-70P1 black-and-white miniature TVs.
The proposed circuit allows you to remove the dependence of the voltage supplied to the high-voltage coil on the threshold of operation of the dinistor (they are most often used), as is implemented in previously published circuits.
The circuit consists of a self-oscillator on transistors VT1 and VT2, which increases the voltage to 120 ... 160 V using a transformer T1 and a thyristor start circuit VS1 on the elements VT3, C4, R2, R3, R4. The energy accumulated on the capacitor C3 is discharged through the winding T2 and an open thyristor.
Fig. 1.25
Transformer T1 is made on an annular ferrite magnetic circuit M2000NM1 of size K16x10x4,5 mm. Winding 1 contains 10 turns, 2 - 650 turns with PELSHO-0,12 wire. Capacitors are used: C1, C3 type K50-35; C2, C4 type K10-7 or similar small-sized. Diode VD1 can be replaced by KD102A, B. S1 - microswitch type PD-9-2. Any thyristor can be used, with an operating voltage of at least 200 V. Transformers T1 and T2 are attached to the board with glue.
The printed circuit board of the device has dimensions of 88x55 mm (see Fig. 1.25).
The whole circuit, together with two A316 batteries or HkHz-0,45 batteries, is easily placed in a pack of cigarettes with a rigid frame (CTOLICHNYE type) (Fig. 1.26).
Rice. 1.26. Case design option
The discharge chamber is located between two rigid wires with a diameter of 1...2 mm at a distance of 80...100 mm from the housing. The spark between the electrodes passes at a distance of 3 ... 4 mm.
The circuit consumes a current of no more than 180 mA, and the battery life is enough for more than two hours of continuous operation, however, continuous operation of the device for more than one minute is not desirable due to the possible overheating of the VT2 transistor (it does not have a radiator).
When setting up the device, it may be necessary to select elements R1 and C2, as well as change the polarity of turning on winding 2 at transformer T1. It is also desirable to carry out tuning with uninstalled R2: check the voltage on the capacitor C3 with a voltmeter, and then install the resistor R2 and, by monitoring the voltage on the anode of the thyristor VS1 with an oscilloscope, make sure that the discharge process of the capacitor C3 is present.
The discharge of C3 through the winding of the transformer T2 occurs when the thyristor is opened. A short pulse to open the thyristor is generated by the transistor VT3 when the voltage across the capacitor C3 rises to more than 120V.
The device can also find other applications, for example, as an air ionizer or an electroshock (frightening) device, since a voltage of more than 10 kV appears between the electrodes of the arrester, which is quite enough to form an electric arc. With a small current in the circuit, this voltage is not life-threatening.
Publication: cxem.net
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