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The Fryback Transformer

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Adam Munich

Mon Apr 04 2011, 05:01AM

Registered Member #2893 Joined: Tue Jun 01 2010, 09:25PM
Location: Cali-forn. i. a.
Posts: 2242

Ladies and gentlemen of the forum, I present to you a marvellous device that will revitalize your health and bring wondrous wealth and prosperity to your families and all future generations. Straight from Nikolai Tesla's labs I bring you a fantastic revelation in high voltage transformer technology, made with nothing but the latest and greatest materials this marvellous transformer will supply all the milliamperes you'll ever need along with more than four thousand volts! Such mind boggling wonders can be had with this magnificent transformer...

/1920's sales pitch

So my Fryback is done. After 24 man hours of work, 40 layers of windings and at least 1/6th of a mile of 28ga wire it is ready for action.

How I made it:
Step 1;

wind wire.
Step 2;

coat with 5 layers teflon tape
Step 3;

One layer of e-tape and moar wire. Then put e-tape strips around edges.
Step 4;

Repeat until brain melts
Step 5;

Attach silicone insulated wire
Step 6;

Cover it with 7 coats of liquid electrical tape

And here it is next to a 555 timer.

When fed with 36V by a zvs it puts out 4kV at [YTB] milliamperes. Since I used 40 layers that's a max of 200V between layers, and seeing as I used at least 3kV worth of teflon and tape this transformer could probably be fed 56V and still work just fine. Primary is 4+4 of 12ga litz.

The core gets a little warm but the metal clamp gets smoking hot. I need to make a plastic one for it as it is robbing much of my energy. W/O the clamp arcs are one inch thick, w/ the clamp they are only .7in thick and shorter. Nonetheless they are ridiculously hot and I still need to measure the current. The secondary stays cool even with 3 minutes of continuous arcing.

And a video in which I couldn't get the arcs to stay put. Damn wind.

Patrick

Mon Apr 04 2011, 05:10AM

Registered Member #2431 Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639

Nice chicken stick! (with chicken)

Some of those pics seem to be doubled up when I click on them.

Adam Munich

Mon Apr 04 2011, 05:29AM

Registered Member #2893 Joined: Tue Jun 01 2010, 09:25PM
Location: Cali-forn. i. a.
Posts: 2242

Fix'd

magnet18

Mon Apr 04 2011, 05:45AM

Registered Member #3766 Joined: Sun Mar 20 2011, 05:39AM
Location:

Posts: 624

Those are some nice arcs, very nice.
Out of curiosity, what circuit are you using to drive it?

Freitsu

Mon Apr 04 2011, 09:34AM

Registered Member #3147 Joined: Sun Aug 29 2010, 10:53AM
Location: Finland
Posts: 56

A little bird told me it was powered with a ZVS circuit...

PS.

Nice work Grenadier! :D

Patrick

Mon Apr 04 2011, 05:38PM

Registered Member #2431 Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639

Yeah pics are better now, what freq are you running at that you felt compelled to use litz?

Xray

Mon Apr 04 2011, 07:33PM

Registered Member #3429 Joined: Sun Nov 21 2010, 02:04AM
Location: Minnesota, USA
Posts: 288

Nice job! You should start a business making FRYBACK transformers (if your brain can handle the stress! LOL).

radhoo

Tue Apr 05 2011, 08:27AM

Registered Member #1938 Joined: Sun Jan 25 2009, 12:44PM
Location: Romania
Posts: 701

Nice work, but it has a major problem: all that tape will slowly slip off the center, and first you'll get something like a cone, than it will fell off completely. Since tape's adhesive doesn't harden after being applied, it is free to move in any direction, and because of the shape you've created the tendency is to get off the roll, and fill the middle.
It's fixable - but you need to act before the tape shape starts distorting: simply put it between two plastic discs, and fix those together using a few screws.

-or- try the design with epoxy that I posted a few days ago (but probably you've seen it already):

Adam Munich

Tue Apr 05 2011, 10:52AM

Registered Member #2893 Joined: Tue Jun 01 2010, 09:25PM
Location: Cali-forn. i. a.
Posts: 2242

@Patrick
I used litz because it's flexible

@Xray
I'm not making another one of these for at least a year.

@Radhoo
I don't think it'll be a major problem with the liquid tape on there holding it in place. So far I haven't seen any sign of slippage.

The biggest problem is the iron stealing my power. The other day I pumped 540 watts into the FBT and the arcs only looked like 300W ones at best. I need a plastic clamp or something...

Dr. ISOTOP

Tue Apr 05 2011, 04:51PM

Registered Member #2919 Joined: Fri Jun 11 2010, 06:30PM
Location: Cambridge, MA
Posts: 652

I use a wood clamp on my big ferrite transformer, and it works pretty well.

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