Strobe. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Strobe. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Musician

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In discotheques, lighting fixtures are very common, creating periodic bright flashes of light. They are usually, although not quite correctly, called strobe lights. A diagram of one of these devices, very simple, is shown in the figure.

Strobe

Resistors R1, R2 connected in parallel limit the charging current of the storage capacitor C2, and the diode VD1 prevents it from discharging in negative half-cycles of the mains voltage. Circuit R3C1, cold cathode thyratron VL1 and transformer T1 form a pulse generator.

As the capacitor C1 is charged through the resistor R3, the voltage applied to the interelectrode gap of the thyratron VL1 increases. As soon as it reaches a value equal to the ignition voltage of the thyratron (approximately 100 V), a gas discharge flashes in the latter and the capacitor C1 is discharged through the winding I of the transformer T1. A pulse with an amplitude of several thousand volts induced in the winding II of the transformer initiates a discharge in the flash lamp EL1. The electrical energy accumulated by capacitor C2 is converted into light energy. At the end of the flash, the discharged capacitor C2 will again begin to charge through the resistors R1 and R2, and the capacitor C1 - through the resistor R3 and the cycle will repeat.

Resistors R1, R2 - wire PEV-25. They can be replaced by several of a different type and rating, connected in such a way that the assembly resistance is 100 ... 150 Ohms, and the total power is at least 50 watts. For example, turn on five PEV-10 560 Ohm resistors in parallel.

Capacitor C1 - any metal-paper (for example, MBM) or film (K73-17) for a voltage of at least 160 V. Capacitor C2 - oxide K50-27. In the absence of a 100 microfarad capacitor, it can be made up of several parallel smaller capacitances for a voltage of at least 450 V. Resistor R3 can be of any type. Its value is selected, achieving the desired flash frequency, which, however, should not exceed 1,5 Hz.

Instead of IFC-120, you can use other flash lamps from domestic or imported photographic equipment. When mounting the MTX-90 thyratron, it should be borne in mind that the black dot on its cylinder marks pin 1 - the cathode. If a thyratron with a too low ignition voltage is caught, the amplitude of the pulse on the winding II of the transformer T1 will be insufficient to ignite the flash lamp. In such a case, it is worth experimenting by replacing the installed thyratron with another instance of the same type, another similar device (for example, TX4B) or even a neon lamp.

The T1 transformer is self-made, its windings are placed on a ferrite rod 400NN or 600NN with a diameter of 7 ... 10 mm and a length of 55 mm. Winding II is wound first, it contains 450 turns of wire PEV-1 0,28. Each row of this winding (150 turns) is insulated from the next by a layer of capacitor paper. Three layers of paper are laid between windings I and II. Winding I - six turns of wire PEV-1 0,8.

Given the significant heat release of the stroboscope elements, its body is made of heat-resistant material - fiberglass. It is highly undesirable to make the case metal, since the parts of the device are under high voltage. The window in which the EL1 lamp is installed is protected by frosted or transparent glass. Behind the lamp is a light reflector - a plate painted with "silver" paint. In the area of resistors R1, R2, capacitor C2 and lamp EL1, ventilation holes are provided in the case.

Author: I.Kukhta, Kargopol, Arkhangelsk region

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