Can you upload to youtube detail video circuit of new prototype driver.. Your best bet is a laptop battery charger that provides at least A at 18 to 22V. But having experimented a bit, I found that that primary coil draws a boatload of current, in excess of 5 amps. And my flyback contains a capacitor its a one problem or no. Thaks for your help ;D. Also, thank you for making this post. I love the way you explain each step.

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In fact flyback transformers aren’t really conventional transformers at all, but coupled inductors which means they should be driven differently.

Flybacks are designed to work best anywhere between 15 to kHz, so some experimentation is required to find the intended operating frequency. Here is the stripboard layout and the assembled circuit board.

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Flyback driver #2: NE555 quasi-resonant

I love the way you explain each step. Actually when power grows up on the gate of my transistor the signal is really bad: Tomer just check that everything is wired correctly, if it is, check that all the parts are functioning.


Input power should be volts, the current draw can reach a few amps. Maybe I screw something up but where I have to connect ferrite and other HV pin. Thanks for the reply. The fast diode is there to account for the Miller capacitance.

No hissing, pitching or whatsoever. Then check the transistor. A word of caution: This is a basic NE multivibrator circuit. Tired of measly sparks? Flybacj you confirm that, compare how much does the voltage drop on your battery cells when you connect it back again.

Flyback Driver – Experimental Engineering

Timmer the ground to the steel spring that holds the two cores together, do not make a loop around the core. I found that the system works without blowing the 3 amp. Dear Jonathan, Thank you for this circuit. Subscribe To Posts Atom. Yes it could, the frequency will be ten times lower the flyback is designed to run.

These are just a few signs that the machine is alive and kicking.

I think there may be something wrong with the oscillation circuit. You say you used a current limiting resistor during this sort of testing but you have not specified where you put it in the circuit. Also, where does the negative of the second supply go?

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If not what is the function of this capacitor? Thanks for answering Josef I need to build a 5555 to use as delivered 50KV electrostatic flock for a machine must be DC.

It has a big red cable with a suction cup. The output voltage depends on the oscillator frequency set it to variable kHz for output voltage fine-tuningnumber of primary turns and on the resonant capacity.

I try to fix up the frequency and duty cycle with help from simulation software. Due to the large turns ratio of the flyback the few hundred volts at the primary become several thousand volts on the secondary. It looks something like below.

555 Flyback Driver

So you need a higher voltage. Next, you need to identify the primary and secondary pin out.

Here is diagram that i am using: