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Efficient Flyback Driver High Volts circuit using IC555

This is Efficient flyback driver circuit, a good and fairly efficient flyback driver circuit. All parts can be obtained easily from Radio Shack, including the MOSFET. This circuit uses a 555 timer IC to pulse a 2N2222 with square wave at a frequency that is set by the capacitor and the potentiometers.

The 2N2222 then drives the gate of the MOSFET and the MOSFET delivers the pulse to the ten turn winding on the flyback. If you build this circuit you will have to adjust the potentiometers until you get the longest arc possible. The circuit will run from +12VDC to +15VDC at about 3A.

The MOSFET must be heatsinked! This is important if you are going to run this for any decent amount of time. If the MOSFET still gets too hot or burns up you can place a 4 ohm (for a +12V supply) or a 5 ohm (for a +15V supply) between the source lead of the MOSFET and the primary on the flyback.

Make sure that these resistors havethe proper power rating for the voltage and current that they will be carrying. The flyback should be wound with ten turns of 14-16 guage solid wire. Anchor it in with some electrical tape. Any previous primary windind should have already been removed before winding the new one.
Efficient flyback driver circuit by IC 555 + IRF510

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This Post Has 13 Comments

  1. Please Be CAREFUL when Constructing These Circuits!!!

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  6. You need a diode into primary to avoid destroy the transistor

  7. hi what is the value of the cap?(.01) please answer

  8. Hello,
    why you are using 100V Mosfet? please use similar but for 800-1000V and you will see that you do not need a heatsink 🙂

  9. can I use IRF540 on this circuit????

  10. Why that my 555 always blow up the set up that imake is that im using 1 watt for all resistors.please advise something helpful to solve this problem.next thing is that im adding salt water capacitor a size of jam glass container with an output of more or less 30 kv to the flyback neg and poss output.this thing can possibly affect to damage. My t555 ic.please give some suggestions about this thank you.

  11. If you add a diode backwards across the primary of the flyback it eliminates inductive voltage spikes which can potentially kill your mosfet transistor!

    (I killed 5 until I added the diodes!)

  12. can u please give me a solution for my question it is that how to produce 7amps current as an output by giving dc voltage as an input to the circuit , one important thing is that without using transformer please help me guys.

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