20,000v Flyback Transformer

About: i love anything to do with power conversion. especially high voltage power conversion. i also really enjoy skateboarding and hunting

This is a Flyback Transformer connected to a quick charge capacitor and 2 camera flash circuits

Do not attempt this instructable if you have no prior experience with high voltage, or if you have a dodgy heart.

Step 1: Tools and Materials

You will need:
-A soldering iron
-a capacitor (see picture)
-a Flyback Transformer
-a switch
-2 Kodak camera flash circuits
-a battery holder
-2 AA batteries

Step 2: Camera Circuits

On this instructable https://www.instructables.com/id/Coilgun-Handgun/, follow step 1 on how to make a mini charger-circuit. Link the outputs in parallel. Then, connect the inputs in series so they will run off 3v. If they don't work, try putting some diodes in and check your connections. Solder the circuits on the battery holder. 

NB, having 2 charger circuits is not essential, one will do the job just fine 

Step 3: The Flyback

Follow the instructions on this website http://lifters.online.fr/lifters/labhvps/tht.htm on how to find the primary and secondary coils on a Flyback transformer. Or wind your own primary coil. Solder some wires on and your ready for the next step!

Step 4: The Capacitor and Switch

Solder the capacitor on one of the wires of the Flyback, and the switch on the other. Then solder the other end of the capacitor and the other end of the switch together, making a circuit. Tape it all to the side of the Flyback.

Step 5: Last Step!

Finally, solder the 2 outputs of the camera circuits onto the capacitor, in such a way so when the circuits are switched on, the capacitor charges.

Now put the batteries in the battery holder, turn it on and push the switch while the 2 output wires of the Flyback are about 1-2cm apart, and, look! a spark!

This circuit also works with a car ignition coil in place of the flyback.



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    20 Discussions


    9 years ago

    Hey, this is a great instructable and is very informative. Just one thing is missing... pictures! It really helps a lot when trying to follow directions so you should consider taking some photographs. Once you do that and leave me a message when you have so that we can publish your work. Thanks! Thanks for the cool instructable and we hope to publish this soon!


    9 years ago on Introduction

    Quite honestly, this isn't the greatest way of going about generating high voltage, but if you replaced the charging source with something a little more powerful, wound your own primary coil and selected a capacitor that would resonate with the flyback's secondary coil, and added some sort of solid state triggering mechanism (an IGBT, for instance), then this could get interesting....

    2 replies
    slipknot rulesXellers

    Reply 9 years ago on Introduction

     thanx 4 your input Xellers, this is my first instructable, so i tried to keep it simple; something you could throw together in 5 mins or so. The only thing i made this circuit for is just for making sparks, nothing practical :)

    well the capacitince isnt that high, so i think that the greenish coloured one would give a better spark but i say go for it! the world was built around tinkering and trying new things.

    the numbers/letters are; 364j  dh
                                                 250 sa v

    P.S. i got it from a old tv

    um well the voltage is high enough, and the 364j means that its capacitance is about 0.34uF so yea i say go for it but u mite not gt a realli big spark :D

    slipknot rulesCrimson-Deity

    Reply 9 years ago on Step 4

    because the capacitor gets charged this way. if u hav any suggestions for cool mods to the circuit, i would like to know :)

    slipknot rulesCrimson-Deity

    Reply 9 years ago on Step 4

    When the camera circuits are turned on it charges the capacitor. when you press the switch this discharges all the stored energy from the capacitor into the transformer. this small amount of energy (low voltage-200v or so) gets turned into a high voltage spark by the transformer. when you take your finger off the switch microseconds after the spark occurs, the whole process repeats itself.


    9 years ago on Introduction

    what should i do with the other pins?
    sometimes spark occured between them.
    especialy some closest pins with ground pin.
    one of pin closest is also draws purple spray, but never spark

    1 reply