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Old 09-13-2009, 11:19 AM #1
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Default Mad Scientist

Dangerous! But it looks like fun.....

This High Voltage Flyback Transformer Driver is Remarkable! - CircuitGeek

I might build a similar circuit to drive a DIY nitrogen laser.


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Old 09-13-2009, 02:35 PM #2
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Default Re: Mad Scientist

Yeah HV is very fun.

I would recomend you go with a ZVS driver though, there are too many things wrong with the 2n3055 single transistor driver to count.

ZVS schematic, it looks a bit difficult at first but once you start building it, you realize that is EXTREMELLY simple to build.





Here is my video only 12V input. It was tuned for current not voltage (white thick arc means more current) It will incinerate anything in its path. With 36+ volts you can expect arcs of 1 foot +

http://www.youtube.com/watch?v=8alfhHer9Ec

Same driver and flyback powering a small Tesla Coil.

http://www.youtube.com/watch?v=w-aFIZkMyck
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Old 09-13-2009, 11:30 PM #3
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Default Re: Mad Scientist

Thanks for the info! What voltages and currents on the output of the device? My nitrogen laser would run nicely with about 10KV at 10ma.
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Old 09-13-2009, 11:39 PM #4
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Default Re: Mad Scientist

Be careful with that -- It could be a killer in the wrong hands. Nice driver circuit and yes it will light up a N2 laser.

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Old 09-13-2009, 11:41 PM #5
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Default Re: Mad Scientist

Definitely use the ZVS !!! This is an excellent circuit. The 2N3055 is weak and marginal. It blows quickly and frequently. ZVS can deliver several hundred watts of HV pleasure. I've also used IRFP260's and 460's to make this circuit. Use a good quality capacitor, or it will heat up and burn out. You need fast diodes, not 1N400X. (NTE575, etc.) Experiment also with different inductors. You can use an AC or a DC flyback. I wound a few different secondaries on my lathe and cast them in epoxy as it can be hard to find an AC flyback.
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Old 09-14-2009, 10:47 PM #6
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Default Re: Mad Scientist

In my opinion it is perhaps the best flyback driver, works pretty well as an induction heater as well, can also be used to make a small SSTC...talk about versatility.

Going for a half bridge of full bridge and running off-line will net more power, but what does that help when the flybacks can't take it. Low part count easy to tune, high power output. I also use 460's usually, never have 250s on and hand my other powerfets are overkill. I think someone on 4HV called the 460 the vanilla ice cream of FET's.

And yes like Hemlock Mike said, please be careful, high voltage is a tricky mistress.
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Old 09-15-2009, 09:47 AM #7
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Default Re: Mad Scientist

I built a HV flyback transformer designed "plasma ball" years ago. If you put a damp cloth on the globe it would give you an uncomfortable shock.
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Old 09-15-2009, 10:44 AM #8
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Default Re: Mad Scientist

A shock from a ZVS with decent input, while not necessarily fatal, will definitely be more than just unpleasant, though. Can't tell you how bad, as I make it a personal mission not to get shocked, but from what i've heard its better to not find out from first hand experience.
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Old 10-15-2009, 09:14 AM #9
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Default Re: Mad Scientist

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Originally Posted by Olivia View Post
Looks cool and no question - dangerous. Careful or else before you know it you're dead. fun death
No, an honored death
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Old 10-15-2009, 09:19 AM #10
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Default Re: Mad Scientist

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No, an honored death
No honor in stupidity Jay.
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Old 10-15-2009, 09:29 AM #11
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Default Re: Mad Scientist

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No honor in stupidity Jay.
No but I want my death to either be a huge explosion or a powerful serge of power. And I want nothing left behind either
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Old 10-15-2009, 10:07 AM #12
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Default Re: Mad Scientist

Not me. I want to fall from a great height with my eyes wide open. Or feeling the cold wash of water in my lungs while drowning. Or even my throat clench while inhaling the hot gas of a fire. Seems a shame to die a quick death when we spend so many years alive. I fear it will probably be a massive heart attack, or my a-hole rotting off because of all the raw meat I eat. They say cancer is a bad death, but I've seen 3 people die from it and they went fast and quietly. I guess when you fight it is when the horrific deterioration of your body makes it drag out for you and your family.
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Old 10-15-2009, 10:25 AM #13
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Default Re: Mad Scientist

My mom has lymphoma. It's back after a long treatment and rest but ... well. As much as I laughed at the rotting ass part the cancer has been on my mind for along time now. I used to have nightmares as a kid that she would die with some sickness and it seems to have come into fruition
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Old 10-19-2009, 12:15 AM #14
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Default Re: Mad Scientist

Quote:
Originally Posted by millirad View Post
I might build a similar circuit to drive a DIY nitrogen laser.
DIY nitrogen lasers are interesting. Have you thought about using subdermal needles or a long stack of razor blades for the electrode design? Sharp tips give a more even discharge profile, the way I understand it.

If a few people were to do a group buy of suitable mirrors, the discharge could be longitudinal instead. That gives way better performance than transverse, at the cost of a higher voltage or lower pressure. Works for neon and a lot of other gases, too.
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Old 10-19-2009, 05:45 PM #15
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Default Re: Mad Scientist

Quote:
Originally Posted by billg519 View Post
Definitely use the ZVS !!! This is an excellent circuit. The 2N3055 is weak and marginal. It blows quickly and frequently. ZVS can deliver several hundred watts of HV pleasure. I've also used IRFP260's and 460's to make this circuit. Use a good quality capacitor, or it will heat up and burn out. You need fast diodes, not 1N400X. (NTE575, etc.) Experiment also with different inductors. You can use an AC or a DC flyback. I wound a few different secondaries on my lathe and cast them in epoxy as it can be hard to find an AC flyback.
I found this AC flyback a while ago at a local TV repair shop. I heard that this kind can be pushed so hard to where the primary will arc over to the secondary!

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Old 10-19-2009, 07:40 PM #16
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Default Re: Mad Scientist

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I found this AC flyback a while ago at a local TV repair shop. I heard that this kind can be pushed so hard to where the primary will arc over to the secondary!


Yeah looks like a monster. You could make a monster plasma speaker out of it, with a thick and long enough arc some major bass can be expected.

Should handle 500W quite nicely, just have to tune it (if you plan on using ZVS). What are you going to drive it with?
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