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The circuit is driven by a 2N transistor making the voltage adequate for this application. The driver is built on a piece of vero board with multiply resistors to obtain the needed wattage rating, this is far from optimal as the load sharing between them is horrible, to ensure better sharing. Either way, ohms will operate the circuit at voltages as low as 5V without any problems. If there is too little current being drawn, than it is not oscillating it should start oscillating at about 5V input and you may need to reverse the leads on the feedback winding. There is also a push-pull version of this driver, more on that can be found following this link:

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It also could be your power resistors are Wire wound which raises the impedance inductance and transient voltage causing damage to the 2N Vbe.

This circuit seems to have a maximum current usage around 3 Amps or so, possibly due to inductor action in the transformer primary which actually limits the current rather than resistance. If your flyback was used in association with a cascade, you can expect to obtain no more than perhaps 12kV from it with 12V input.

Can a 13007 NPN transistor be used as a substitute for a 2n3055 in a flyback driver circuit?

Thanks for the succinct explanation! Should you accidentally touch the heat sink while you are holding, say, a plasma globe, flyyback transistor would be ruined immediately, unless it was insulated. You will not be able to locate the high voltage return pin with a multimeter. Keeping the electrodes just far enough apart for no spark to jump, a beautiful corona breakout is visible. Transistor selection is VERY important especially if you are using a newer flyback or any non-disc shaped secondary.

  141211-424 REV 01B DRIVER

At voltages higher than 12 VDC input, the components will dissipate a lot of heat and the 2n transistor is most likely to burn as it is not fpyback for more than 15 A and it has to be derated even further for case temperatures above 25 o C.

To your right you can see the schematic symbol of an NPN transistor, and how the pin arrangement translates into real life on a diagram of the transistor. Perhaps some added capacitance on the output of the power supply could even the spikes out.

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It didn’t hurt though, but it just shows you how much feedback is produced by the circuit This is important, as the transistor case may float at high voltage yup, I’ve been shocked of that too: Sometimes the switch activates a relay If it is the primary that is burned out, than it may simply be removed as you will wind a new one either way. I have heard and it seems very plausible to me I am no electrical engineer that the circuit works in the following manner: The frequency of operation is automatically adjusted to resonance, depending on many factors.

2n3055 flyback driver

Also note that the even newer flybacks out in the market today have the voltage divider and focus control built in. What determines the appropriate capacitance and voltage rating?

Radio Frequency Plasma Globe To make a plasma globe you really need two things. Short circuit current and very little current are both indications that it has been ruined by over voltage or overheating, respectively.


This is a very simple fljback cheap circuit to achieve around 20 kV high voltage, but where it excels in simplicity it lacks a lot in stability and efficiency. Is it the transistors or what? Yes, my password is: The venerable old 2N is specified to only 60v on the collector.

Would that be resolved by adding those diodes?

Transistor Driven High Voltage Flyback Transformer Page.

When power is applied, the transistor will conduct the current allowed through resistors R1 and R2 into the flyback primary, causing it to induce a current on the secondary, and, at the same time, on the feedback winding. Not for any particular application right now, just wanted to make a high voltage supply those with arcs. As for the wire windings I used 20AWG hookup wire. The driver is built on a piece of vero board with multiply resistors to obtain the needed wattage rating, this is far from optimal as the load sharing between them is horrible, to ensure better sharing.

I’m trying to build a flyback transformer driver based on the schematics at http: How this came into being, what it is for. I finally bothered to set up a couple of server power supplies in series to try this circuit at 24V. These are useless for this circuit. I experimented with voltages between 12 to 17 VDC, there is no incredible performance with higher voltage compared to the amount of heating the higher voltage generates.

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