I also am using a garden lead acid Baterry. If the mosfet heats add more turns, remove turns to increase power. I did tune the frequency for the flyback 39kHz and the performance is really nice. Good day to all This monster generates DC? Could anybody recomend a flyback manufacturer or even better a model number of one that works well for this project.

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Hey Mads, A friend and I just put together the circuit hopefully exactly as it was depicted in your schematic.

Maybe the flyback it self is having a problem? This would serve to further the education those studying. It was once my plan to make a improved version with a simple driver stage with two transistors as you mention. Tune these factors to get the best output which suits for you. If you follewed the schematics to the point it should work, remember crossing wires in the schematic are only connected if there is a dot.

555 Timer-Based Flyback Transformer Driver

You may also try a car battery if you have one. The MOSFET looks fine for this project, but remember that difference between timers from difference companies is their output current ability. Thanks — the flybacks used here are generic 90ss CRT TV ones as described in my guide to flyback transformers. And my flyback contains a capacitor its a one problem or no.

Uzzors2k Hobby Projects Site

May 22, at More than 50 kilovolts out of a single flyback at 20 volts input. It keeps its bright for a moment and fades out.

I have built this circuit and once got a good arc but cant seem To repoduce it again.

Can you help me out? September 28, at Thanks a lot Ernesto. All parts except the timer are non-critical.

NE Flyback Driver

This is going to be for a year end physics project for now as I am new into this venture. I did manage to salvage the mosfet you use in the schematic, the irfpN. Winding your own Primary.

Hey Giorulesall I am not sure, but when the circuit runs open loop there could be transients going backwards in the circuit and other stress factors trsnsformer could make the MOSFET squelch.

Also don’t wield the hot HV wire barehanded, but use a “chicken-stick” or non-conductive rod to move the HV or ground wires.

This circuit is a great way to learn the basics of the timer and pulse width modulation, I certainly did learn allot from this circuit flyyback your website in particular has been a great help for me in learning how these circuits operate.

Stuff like this is what can get people interested in electronics and wondering how it can work.

Try to calculate the resonant frequency of your secondary with the aluminium topload, then see if you can modify the circuit to be in range of that same frequency. I can get a spark approx 1. If the MOSFET heats up a lot, it might be running in linear mode and thus the is not supplying enough drive current.

The drain is connected to the wire that wraps around the flyback, and the source is connected to the negative power supply.

Its hard to give a general troubleshooting of a buzzing arc, but try to vary the frequency till you find one that is silent.

Flyback Transformer Drivers

If your removing a flyback from a crt, make sure you short out the crt first. This depends on both the inductance value and the resistor value. To find out more, including how to control cookies, see here: You might be drawing too much current from theto drive the MOSFET, try a higher value gate resistor or implement a couple of transistors to drive the gate with instead of using the output.

The ignition coil also returns much more EMF that will destroy your circuit. Pay attention to correct coil phasing, if using a DC flyback!