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Should i buy off techonico?

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Killa-X

Wed Feb 18 2009, 01:36AM

Registered Member #1643 Joined: Mon Aug 18 2008, 06:10PM
Location:
Posts: 1039

I guess they sell stuff for repairing, and I was looking for a flyback transformer.

Do you guys think I should buy off of them? I searched this forum and no one has talked about them yet..

Myke

Wed Feb 18 2009, 01:47AM

Registered Member #540 Joined: Mon Feb 19 2007, 07:49PM
Location: MIT
Posts: 969

The easiest and cheapest place to get flyback transformers is from TVs left out on the side of the road. I think most, if not all, people on this forum get flybacks from TVs or from other people who got them cheaply.

You would only need those flybacks if you needed matching ones or were repairing a TV set that needed that one flyback.

rp181

Wed Feb 18 2009, 02:11AM

Registered Member #1062 Joined: Tue Oct 16 2007, 02:01AM
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Posts: 1529

look at craigs list and see if anyone in your area has free CRT's.

Killa-X

Wed Feb 18 2009, 02:25AM

Registered Member #1643 Joined: Mon Aug 18 2008, 06:10PM
Location:
Posts: 1039

Well they have some going for 17 dollars and free shipping, I get your point still.

some on craigs list have "no picture, sound works!" but i dought flyback is fine.

But theres a few free-if-pick-up

Billybobjoe

Wed Feb 18 2009, 08:00PM

Registered Member #396 Joined: Wed Apr 19 2006, 12:55AM
Location: Pittsburgh, PA
Posts: 176

Killa-X wrote ...

some on craigs list have "no picture, sound works!" but i dought flyback is fine.

Why do you say that? There are other components in a TV aside from the flyback that work to produce a picture . .

Plasma Lover

Wed Feb 18 2009, 08:12PM

Registered Member #1911 Joined: Mon Jan 05 2009, 06:30PM
Location: Salem, Oregon, USA
Posts: 165

Billybobjoe wrote ...

Killa-X wrote ...

some on craigs list have "no picture, sound works!" but i dought flyback is fine.

Why do you say that? There are other components in a TV aside form the flyback that work to produce a picture . .

The CRT can go bad, the transistor or the other driving utilities for the flyback can go bad, the deflection coils can have a short, in which case you get a bright dot in the middle of the screen, etc. T.V.s are pretty complicated little things and, in fact, I'd be willing to bet that flybacks are one of the least complicated things in a T.V., even if their design is complex and difficult, the principles behind their functioning is extremely simple.

Arcstarter

Wed Feb 18 2009, 10:12PM

Registered Member #1225 Joined: Sat Jan 12 2008, 01:24AM
Location: Beaumont, Texas, USA
Posts: 2253

It would be so much cheaper to find flybacks. I have i think one flyback left. Depending one where you live, i could just straight up give it to you. If you live too far away, you would have to pay for the shipping though. You can also make your own high frequency high voltage ferrite transformers (not technically flybacks). If you are not into doing this type of thing, i could make you one. They have AC output, they have lower voltage, and have higher current. Mine can pump out about 6kv and 116ma continuous without getting hot (700 watts). Get some high frequency high voltage diodes (uf4007 are perfect) and string them together to get DC for a tesla coil or capacitor charger.

Homemade flybacks would work much better for tesla coils. They can be (and usually are) lower voltage and higher current, which is good. They will not die as easy as professional if made right, and the diodes are easy to replace. they are perfect for the zvs driver :). I could make you one for cheap, with good insulation and thick wire to handle alot of current.

With my homemade flyback, i got about 8 inch sparks on a tesla coil setup, with no tuning, too small capacitor, and slow diodes (wayyy too slow, slower than 1n4007's iirc).

Killa-X

Thu Feb 19 2009, 03:47AM

Registered Member #1643 Joined: Mon Aug 18 2008, 06:10PM
Location:
Posts: 1039

Yeah I cant fully say yet. I might be getting some flybacks, but maybe sometime I could contact you and talk about it. I live in Michigan, So I don't know what you would pay me for the time to make one for me and send it out....

Yet, Keep in mind as for now, I'm using only 12V 2A, hopefully 7A soon, on 555s...

KLH

Thu Feb 19 2009, 05:25PM

Registered Member #1819 Joined: Thu Nov 20 2008, 04:05PM
Location:
Posts: 137

Arcstarter wrote ...
You can also make your own high frequency high voltage ferrite transformers (not technically flybacks). If you are not into doing this type of thing, i could make you one. They have AC output, they have lower voltage, and have higher current. Mine can pump out about 6kv and 116ma continuous without getting hot (700 watts). Get some high frequency high voltage diodes (uf4007 are perfect) and string them together to get DC for a tesla coil or capacitor charger.

To expand on this, these high frequency high voltage transformers have no gap, which means you cannot operate them like an ordinary flyback (sorry if this is already known). They are usually operated in push-pull, half bridge, or full bridge mode. If you can't find a core that can store energy (gapped ferrite, iron powder, etc.), then you can configure the windings like a forward transformer, with a reset winding. I personally would prefer winding custom flybacks on iron powder cores from Amidon (use the 26 material if you are just starting to make your own magnetics).

If you want to use ungapped ferrite for your transformer, Amidon also sells large cores capable of wide ranges of power (<20 all the way up to ~1700W, dependent on core size and operating frequency).

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