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4hv.org :: Forums :: High Voltage
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Fly back driver modifacations using different parts and diagrams than original out of curiosity.

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Berni
Sun Dec 07 2008, 08:38AM
Berni Registered Member #1132 Joined: Mon Nov 19 2007, 06:15PM
Location: Slovenia
Posts: 84
I agree those are some nice arcs for only 12V input.

Well for tesla coils its not unusual that something catastrophically fails.What relay needs to be tough is the capacitor, But yeah using a big pile of tiny caps for it generally works fine or some people made caps from glass bottles.
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LithiumLord
Sun Dec 07 2008, 02:42PM
LithiumLord Registered Member #1739 Joined: Fri Oct 03 2008, 10:05AM
Location: Moscow, Russia
Posts: 261
Hehe, once we were on high and made a live proof that there's not much point in making flyback-driven SGTCs. The "live proof" was a small OLSGTC built off a half of my old VTTC secondary which got burned so I cut it in two just for the case I'd need a choke/a test secondary/a small expoxy-cardboard bat one day, with a really junky toroid. The whole construct was fed from an old leak-detector supply (had an inductive choke serving as a sparkgap electrode switching magnet as well and a SINGLE LONE PAPER CAP!). No calculations were made at all, we roughly caught the resonant turn (not much to choose from as it was somewhere between 1 and 2 turns in fact, so had some fun with the junk toroid bending), and fired all that pile of junk off. However with all that mess, including a hilariousely low breakrate (less then 50) the attempt can be called a total success, firing an almost 3cm corona and striking a target like 6cm away! With film caps, an IGBT-based switch and proper calculations this really small and virtually invulnerable concept can easily fit in a cigarette box, becoming a very small OLTC that can outrun many of the flyback-driven coils.
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Chris Cristini
Sun Dec 07 2008, 05:30PM
Chris Cristini Registered Member #1749 Joined: Fri Oct 10 2008, 02:04AM
Location: Claremont New Hampshire
Posts: 497
I can see if I can use my friends camera again u should see it at 30v looks like the arc is 3 times longer than that video. The arc is longer than the fly back it self I have to use a chicken stick.I have gone up to 48v and it works for about 5 seconds or one arc and then the fets burn up one at a time so I made it easy to change the mosfets with two three pin PC fan connectors.
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Chris Cristini
Wed Dec 17 2008, 07:29PM
Chris Cristini Registered Member #1749 Joined: Fri Oct 10 2008, 02:04AM
Location: Claremont New Hampshire
Posts: 497
What about this one I just made this up maybe I am on to something maybe not.
1229542131 1749 FT58591 Zvss
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Dr. Dark Current
Wed Dec 17 2008, 08:25PM
Dr. Dark Current Registered Member #152 Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
crazy4 wrote ...

What about this one I just made this up maybe I am on to something maybe not.
If you want to use lower supply voltage, decrease number of primary turns and increase resonant capacitance. No need for boost converters.


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