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Flyback project

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LAN_403

Experimentonomen

Fri Aug 24 2007, 07:48AM

Registered Member #941 Joined: Sun Aug 05 2007, 10:09AM
Location: in a swedish junk pile
Posts: 497

Flybacks are gapped from factory, no disassembly required.

uzzors2k

Fri Aug 24 2007, 03:06PM

Registered Member #95 Joined: Thu Feb 09 2006, 04:57PM
Location: Norway
Posts: 1308

Tonic wrote ...

What are transistors used in PWM section? It's about last uzzor's scheme.

The gate/GDT drive transistors are BD139's and BD140's in every schematic. I'll get around to updating the schematics soon.

HFsstc-freak wrote ...

Flybacks are gapped from factory, no disassembly required.

True, BUT adding extra space increases the self-resonant frequency of the transformer, giving better results at higher frequencies.

Spedy, get parts for the Mazzilli and one of the 555 drivers. The Mazzilli driver will probably be easiest to hook up correctly the first time, but if you're more fond of sparks the 555 drivers are the way to go. IMO the 555 driver performance is pretty good.

Spedy

Fri Aug 24 2007, 03:28PM

Registered Member #964 Joined: Wed Aug 22 2007, 12:39AM
Location: Stockton, CA
Posts: 134

Uzzors wrote ...

Tonic wrote ...

What are transistors used in PWM section? It's about last uzzor's scheme.

The gate/GDT drive transistors are BD139's and BD140's in every schematic. I'll get around to updating the schematics soon.

HFsstc-freak wrote ...

Flybacks are gapped from factory, no disassembly required.

Thanks. Yah, I'm getting a bunch of flybacks and I know where to get acrylic sheet cheap AND the extra ferrite cores. This is going cool.

...

Fri Aug 24 2007, 04:50PM

Registered Member #56 Joined: Thu Feb 09 2006, 05:02AM
Location: Southern Califorina, USA
Posts: 2445

Spedy wrote ...

Thanks. I'll look around, but I have no ATX's.... Would is be possible to make my own? I have no idea how to measure uH's....

If you need the core, or any other parts for the circuit, I have them available in my sale/trade thread If you need just a core, it is $1, with the wire is $5, + shipping.

Spedy

Fri Aug 24 2007, 11:07PM

Registered Member #964 Joined: Wed Aug 22 2007, 12:39AM
Location: Stockton, CA
Posts: 134

... wrote ...

Spedy wrote ...

Thanks. I'll look around, but I have no ATX's.... Would is be possible to make my own? I have no idea how to measure uH's....

If you need the core, or any other parts for the circuit, I have them available in my sale/trade thread If you need just a core, it is $1, with the wire is $5, + shipping.

Really? cool. I'll see if I can scrounge most of the stuff up; If I can't find what I need I'll go there.

Ok, this question is a little of-topic, but I'm Wondering if I should post my "Tesla Coil" project here or at the TC forum. It isn't exactly a resonant xformer, as it dumps 1 or two caps through a couple of pulse coils to get a spark between the output terminals. It's Info-Unimited's "Mini Tesla Lightning generator" kit. I just wanted to document the building it here.

jameselectric

Mon Sept 03 2007, 02:13AM

Registered Member #535 Joined: Sun Feb 18 2007, 06:03AM
Location:
Posts: 65

Not to hijack the thread but on the same subject. Did I wire this flyback right. I have 3 turns of 22 awg and 5 turns of 18 awg.

shadowight

Sat Dec 26 2009, 03:28PM

Registered Member #2513 Joined: Mon Dec 07 2009, 02:03PM
Location:
Posts: 4

hi.
Im having problems with a mazzilli circuit. basically, there is definately a prety high power output, as i can draw a white hot plasma arc with it, but for some reason, it wont charge capacitors. well, it will, just very, very slowley. the other odd thing is there is no sound whatsoever coming from it. no hi pitched wining like you ususally get from a transformer, or anything.

im thinking it is either running at too higher frequency, or there's somthing wrong with the way im rectifing it.

my circuit is exactly the same as on uzzors site, but with a 4.7uF capacitor, and without the comparitors, ie. just the basic driver itsself.

thanks.

vasil

Sat Dec 26 2009, 06:36PM

Registered Member #229 Joined: Tue Feb 21 2006, 07:33PM
Location: Romania
Posts: 506

The caps you try to charge are in a tesla coil circuit? Maibe you set the gap too large.
It is a DC flyback or you have to use an external HV diode? If it is external maibe it is broken and you have high frequency output from the flyback.

shadowight

Sun Dec 27 2009, 11:36AM

Registered Member #2513 Joined: Mon Dec 07 2009, 02:03PM
Location:
Posts: 4

no, just capacitors on thier own, that i plan on using for a coilgun. i'm not sure if theres a diode built into it, but i tried charging the caps without a diode, then with, and neither worked.

what do you mean "high frequerncy output form the flyback"?

the capacitors are 450V 330uF each.

Zeus

Sun Dec 27 2009, 09:30PM

Registered Member #2316 Joined: Tue Aug 25 2009, 03:04AM
Location: Bendigo, Australia
Posts: 107

In regards to the mazilli driver, you can get the inductor, the IGBTs, the ultra fast diodes and if you are lucky the resistors from the power supply boards in plasma tvs.
Just ask nicely in a tv repair shop. (And don't mention hv)

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