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Subject: Re: flyback transformer from scratch
X-Newsreader: Microsoft Outlook Express 6.00.2800.1106
NNTP-Posting-Date: Wed, 04 Dec 2002 21:19:19 GMT
Organization: AT&T Broadband
Date: Wed, 04 Dec 2002 21:19:19 GMT
I was planning on making a much more powerful unit, like the ones that are
used in very old TVs. I need about 15 - 20kV AC (or more) output, and plan
to drive it with a small coil on the side for the feedback to interrupt the
transistor. That way it will run at its own resonant frequency. But I have
one quick question. There are two circuits floating around for driving a
flyback. One uses only one transistor, and the other uses two transistor in
a push-pull configuration (not really sure what that means exactly). Again,
I appreciate your help!
"Robert Baer" wrote in message
> Jordan wrote:
> > During my endless search for a suitable flyback transformer for my HV
> > project, the idea crossed my mind to wind my own transformer all by
> > So far what I would need is a ferrite core (is there any specific type
> > core I would need for a flyback or just a normal rectangular one?),
> > thin (44 gauge?) magnet wire for secondary, 18 - 22 gauge wire for
> > and some sort of machine to wind the secondary coils since it would take
> > hours and days to wind it by hand. I would then coat maybe every 5
> > the secondary with varnish to keep it all together, then put a whole
> > of coats all over the whole thing. I think this sounds like a hell of a
> > project and would be very interesting to do. What do you all say? Am I
> > plain crazy? Does it take like real designing to make one of these
> > How about the math involved to calculate the number of turns of the
> > secondary and determining its resonant frequency, and all that good
> > I'd like to know what you all think of this. Thanks for your input!
> > Jordan
> Well, you can make a flyback transformer with as few as 10 turns on
> "any" core, no secondary.
> Use a bipolar or FET or toggle switch as the solid state interruptor
> and a 1.5V AAA cell for the supply if you want.
> Repetition rate? output voltage? loaded? power to load? input voltage?
> input average current?
> Needs to be defined.
> I used 300 turns, tap at 100 turns was driven, making it an
> autotransformer and keeping the capacitance low even if one was crass
> enough to make the winding uniform as seen in line power transformers.
> All on a 1408 core (dinky) to get in the 1000 volt range using #36 wire;
> used HV insulating spray.
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