The electronic wand is a high-voltage converter. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Beginner radio amateur
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Instead of bulky and inconvenient Wimshurst electrophoric machines and Ruhmkorff coils, high-voltage voltage converters began to appear more and more often in school physics classrooms. With their help, you can conduct experiments in such branches of physics as electrostatics and current in gases. The “electronic wand” we bring to the attention of our readers is one of such devices.
It is mounted in an elongated cylindrical case, at the ends of which the converter conductor horns are fixed (see figure). The device is powered by three 373 or “Mars” elements. One set ensures reliable operation of the “electronic wand” throughout the entire academic year.
The high-voltage converter is assembled on a single transistor using a voltage doubling circuit. A voltage of 4-2 kV is supplied from capacitor C4 to the ball burners.
The converter transformer is made from a car ignition coil. The metal casing is removed from the bobbin, the carbolite cover is removed, the primary low-voltage winding is wound up and the iron core is pulled out of the frame to a length of 15 mm. An additional frame made of plastic or cardboard is put on it, and then two coils are wound with PEV 0,2-0,3 wire: L1-50 and L2-100 turns.
The rectifier parts are mounted on a getinaks board. On one side there are selenium columns, and on the other there are capacitors C2 - C4 POV or KOB, designed for a voltage of 10 kV. Maximum E value. d.s. selected by adjusting the offset value based on V1. To do this, resistor R1 is temporarily replaced with a variable resistance of 270 Ohms. In this case, the collector current should not exceed 0,4 A.
Converter circuit
The design of the "electronic wand"
converter transformer
The cylindrical body of the device is glued together from thick paper. It is closed at the ends with wooden or plastic covers. Rods with conductor borns are mounted in them.
If the number of elements is increased to six, the voltage on the borns increases to 4 kV. In this case, selenium columns should be designed for a voltage of 2 kV, for example 5GE200F. Then it will be possible to light not only Heusler tubes, but also gas-light equipment, fluorescent lamps with broken cathodes, and demonstrate the formation of electron beams in cathode ray tubes and picture tubes.
Author: V.Chernyashevsky
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