A simple electronic toy, the so-called "Jacob's Ladder", can be assembled on the basis of a generator on one bipolar or field-effect transistor. Between two copper wires there is a high-frequency arc. When turned on, when the wires are cold, the arc is at the bottom of the two wires in one place. Gradually the wires heat up and the arc rushes up, reaching the very top the arc "breaks out" from the wires and again appears at the bottom and rushes up
The transistor is mounted on a radiator. When using a field-effect transistor, protection with a zener diode is needed between the gate and the source
The transformer is taken from a TFT TV or monitor, where it works to ignite the fluorescent backlight lamps
Two copper wires are soldered to the terminals of the high-resistance coil, laid out at an angle. The angle is selected experimentally.
The bipolar transistor I used had a collector current of 5 A, a collector-emitter voltage of 160 V and a cutoff frequency of up to 20 MHz.
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