Homemade transformer from 6 V to 30,000 V

Homemade transformer from 6 V to 30,000 V

Sometimes electronics need high voltage for various purposes. This is not so difficult to do if you make a homemade step-up high-voltage transformer capable of delivering 30 kV from the usual 6 V.

Manufacturing a 30,000 Volt step-up transformer


We will need a collapsible core from an old TV with a picture tube. There it is also used in a high-voltage horizontal scanning transformer.
Homemade transformer from 6 V to 30,000 V

We make a frame for the reel. We wrap one side with thick paper and glue it with superglue.
Homemade transformer from 6 V to 30,000 V

We remove the frame from the core and install it on the marker for convenience. Next, wrap it with a layer of tape.
Homemade transformer from 6 V to 30,000 V

We take a wire 0.2 mm thick, an old transformer will come in handy.
Homemade transformer from 6 V to 30,000 V

We clean one end of the varnish, wrap it around a wire and solder it.
Homemade transformer from 6 V to 30,000 V

We insulate with heat shrink. We lay it over the entire length of the frame and wrap it with a layer of tape.
Homemade transformer from 6 V to 30,000 V

We wind the winding in a row of turns to turns. Each layer is 200 turns.
Homemade transformer from 6 V to 30,000 V

After each layer we put two layers of tape and one layer of electrical tape.
Homemade transformer from 6 V to 30,000 V

Such multi-layering is necessary, otherwise the coil will easily be pierced by high voltage.
We wound another 200 turns - we again produce triple insulation.
Homemade transformer from 6 V to 30,000 V

So there should be 5 layers of 200 turns. The total number, as you probably already calculated, is 1000 turns. We put the coil on the frame.
Homemade transformer from 6 V to 30,000 V

On the opposite side, two windings are wound with ordinary wire. The first (blue) 6 turns, the second (yellow) 5 turns. Fix with superglue.
Homemade transformer from 6 V to 30,000 V

Generator circuit


Homemade transformer from 6 V to 30,000 V

Here is a classic blocking oscillator circuit using one transistor. It couldn't be simpler. We assemble a circuit using a bipolar transistor.
Homemade transformer from 6 V to 30,000 V

Homemade transformer from 6 V to 30,000 V

The generator requires virtually no setup. And if the parts are in good condition, it works right away. But if only the generation did not start the first time, try changing the output of one of the windings with each other, then everything should work.

High voltage transformer testing


We power the circuit from a 6 V battery. The high-voltage generator is in operation.
Homemade transformer from 6 V to 30,000 V

The arc fell on the insulation and immediately almost ignited it.
Homemade transformer from 6 V to 30,000 V

Homemade transformer from 6 V to 30,000 V

The generation frequency is about 10-15 kHz. At this frequency, high-voltage discharges are not so dangerous, but you still should not touch live wires while the transformer is operating.

Watch the video


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Comments (11)
  1. Drosselmeyer
    #1 Drosselmeyer Guests 20 November 2019 13:45
    2
    anguished This guy who holds wires with thin insulation and 30 kV in them with his bare hands is Duncan MacLeod?
    1. Well
      #2 Well Guests 20 November 2019 14:10
      7
      It's you like doo-duncan mcleod! High frequency high voltage above 1 kHz is not life threatening. The current flows along the surface of the body—the skin of the body—without harming the tissues.
      1. Drosselmeyer
        #3 Drosselmeyer Guests 20 November 2019 15:26
        9
        Have you ever looked into a TV with a kinescope? I saw how thick the wire was that went from the liner to the voltage multiplier, and there was only 8.5 kV, and after the multiplier it was 25. Solder a thin wire to the output of the liner and let you hold on to it, you would feel the skin effect in full.
        1. guest71
          #4 guest71 Guests 18 February 2022 18:07
          0
          in old TVs with a kinescope, the output from the voltage multiplier is CONSTANT CURRENT and the capacity there is about half a microfarad at a voltage of about 40-150 kilovolts - it easily killed any drunkards who climbed - they wrote it off as a domestic injury until 1991, so as not to increase the safety of the structure = it was expensive for states.
  2. Yuri Fedorovich
    #5 Yuri Fedorovich Guests 21 November 2019 14:07
    5
    If you have an old liner, then there is no need to wind the step-up winding. It already exists. And with good insulation, and with taps for different voltages. I wound the blue and red and I'm done. Just don’t handle high voltage wires with your bare hands. Like on a picture.
  3. Guest Valera
    #6 Guest Valera Guests 24 November 2019 05:45
    1
    Whoever uses adhesive tape in a high-voltage transformer will pierce it; high fluoroplastic tape, which is used in plumbing, etc., holds it well. When insulated with adhesive tape, the circuit will not even start as it will be an insulation breakdown, verified by our own experience
  4. sNgAM
    #7 sNgAM Guests 3 December 2019 14:57
    3
    If the primary has 6V and 6 turns, and the secondary has 1000 turns, then where does 30kV come from?
    1. Drosselmeyer
      #8 Drosselmeyer Guests 4 December 2019 15:50
      3
      Interesting question. But we must take into account that this is a pulse converter, and not just an AC transformer. The transformation ratio is 1000/6 = 167. The voltage on the primary winding should be 30,000/167 = 180 volts. With a supply voltage of 6 V and the duty cycle of the pulses in the primary winding, let’s assume equal to 2, we get a meander with an amplitude of 12 V, the output will be only 12 * 167 = 2,000 V. Yes, it’s clearly far from 30 kV. Therefore, in order to obtain pulses with an amplitude of 180 volts in the primary winding, the duty cycle must be 180/12 = 15 times greater, i.e. about 30. These are such short impulses (relatively speaking) ____________||_______________________________||_____________
      What is the actual duty cycle of this generator - who knows. Even more interesting is that the maximum collector-emitter voltage of the TIP41 transistor is only 80 volts.
      1. humka
        #9 humka Guests 9 December 2019 13:19
        1
        You would read the differences between a flyback converter and a forward converter, and you wouldn’t talk nonsense.
        1. Drosselmeyer
          #10 Drosselmeyer Guests 17 December 2019 14:34
          2
          So what is the main difference? And what kind of pulse converter do you think is shown in the diagram?
  5. Droid
    #11 Droid Guests 21 April 2023 18:21
    1
    Here the maximum is 2000 volts, what the hell is 30,000?