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From: Robert Baer
X-Mailer: Mozilla 4.75 [en] (Win98; U)
Subject: Re: flyback transformer from scratch
Date: Wed, 04 Dec 2002 09:33:03 GMT
NNTP-Posting-Date: Wed, 04 Dec 2002 01:33:03 PST
Organization: EarthLink Inc. -- http://www.EarthLink.net
> During my endless search for a suitable flyback transformer for my HV sci
> project, the idea crossed my mind to wind my own transformer all by myself.
> So far what I would need is a ferrite core (is there any specific type of
> core I would need for a flyback or just a normal rectangular one?), really
> thin (44 gauge?) magnet wire for secondary, 18 - 22 gauge wire for primary,
> 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 layers of
> the secondary with varnish to keep it all together, then put a whole bunch
> 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 just
> plain crazy? Does it take like real designing to make one of these things?
> How about the math involved to calculate the number of turns of the
> secondary and determining its resonant frequency, and all that good stuff...
> I'd like to know what you all think of this. Thanks for your input!
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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