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Electronic gold mine flybacks

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ZakWolf

Wed Dec 15 2010, 03:17PM

Registered Member #3114 Joined: Sat Aug 14 2010, 08:33AM
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Posts: 608

william L wrote ...

well, in a perfect, lossless situation, I would say 60 watts.

Is that enough for break out?

quicksilver

Wed Dec 15 2010, 11:09PM

Registered Member #1408 Joined: Fri Mar 21 2008, 03:49PM
Location: Oracle, AZ
Posts: 679

LittleVenture wrote ...

thanks.

I am thinking about running a 2 or 3 transformer stack of those HV copy transformers or what ever they came from( not the flyback). Will that make a decent coil? i am going to wind a new secondary. I was thinking 1'-1/2" tall and 3 to 4 inches in diameter.

Realistically, they are inexpensive and fun. I would suggest you get them and experiment. Get a nice little 12 or 25v AC source like a little Radio Shack transformer, plug that guy in and draw some arcs. Experiment.

I will say this: they don't like more than about 8A open they way they are. I believe they have some pretty thin wire there and long periods of arcs at 8amps (with a single unit).
3-5A they arc all day long cold as ice. They have a certain similarity to a big zapper; you are in that neighborhood of output. You could make a wonderful voltage multiplier with that type of x-former because of the low current; parts are cheap and a little string of 1N4007s costs pennies.
If you want to make a little SGTC or something, set up your power first so you're making your coil to your power output. It's a very inexpensive and simple solution. While I have a lot of fun with LOPT's - (for me) they are not that easy to make a TC with. Others have had great luck with them - I like a simpler power supply.

When you get them, on the input side you'll have numbered leads #1-4, etc. The Teflon clear leads will have a thicker #2, couple that with clear lead #1 for 12v; for 25v thick #2 with thin #3. Green is ground both sides. #4 output Grn and #2 for your common for a TC. I abused the Hell out of them & only fried one with 8A+ for an extended arc (I got well over 2" & frankly I think I went higher than 8A).

U4R1A

Mon Dec 20 2010, 09:32PM

Registered Member #3505 Joined: Sun Dec 12 2010, 06:03AM
Location: Albuquerque NM
Posts: 108

I just got 3 of these FBT in from Electronic goldmine today so i was excited. I wired the primary and hooked them up to my ZVS turned them up to 15ish volts and...... Nothing.... I tried all 3 of them and.... Nothing. So I hooked the zvs up to a known good FBT and got my normal arcs... Any one have a clue whats going on or did I get 3 crap FBT's???

Adam Munich

Mon Dec 20 2010, 10:11PM

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

Did you find te right ground pin?

quicksilver

Mon Dec 20 2010, 11:48PM

Registered Member #1408 Joined: Fri Mar 21 2008, 03:49PM
Location: Oracle, AZ
Posts: 679

You bought the LOPT and NOT the HV copy machine x-formers?
I thought you were going to buy the copy machine standard HV models. If you DID get the "copy machine" models remember they are 60Hz NST-like deigns without the totality of the thing bult as one. So if you DID get the flybacks......You need to hunt for your ground. But if you got the "copy-machine transformers"....
Get a common 120v / 12v 3a AC power supply transformer using 60hz ac and then repeat. The LOPT uses a driver to push the frequency higher. The NST-type transformer assembly uses 60hz. your LOPT demand high frequency. The copy machine x-formers are much more simple and need standard AC 12 or 24v 3A input from a common Radio Shack power-supply transformer....very simple and robust. No need for a driver.
If that's the case don't push them for long periods past 8A. If you DID get flybacks; reverse you windings, then hunt for your ground.

U4R1A

Tue Dec 21 2010, 01:30AM

Registered Member #3505 Joined: Sun Dec 12 2010, 06:03AM
Location: Albuquerque NM
Posts: 108

@ quick I think your thinking of the wrong person. However I have a ZVS on the FBT and I've tried every number of windings/direction of windings. But I have gotten a small arc out of them @ 20ish Vdc. Considering how small they are and the fact they push 1000Vdc @ 10 Vac they probaly wont make much of an arc.

quicksilver

Tue Dec 21 2010, 02:38PM

Registered Member #1408 Joined: Fri Mar 21 2008, 03:49PM
Location: Oracle, AZ
Posts: 679

You're right I got you mixed up: sorry.
I have some that came from some tiny B&W monitors and there is some similarity. I tried one of those little single transistor drivers and got perhaps - a <one cm arc. But when I put them in series (primary on first of stack then grd to hot and out) I got something better. But realistically their coils may be some really micro-fine wire: they might simply fry at higher ZVS current. Did you try them in series yet?

U4R1A

Tue Dec 21 2010, 03:43PM

Registered Member #3505 Joined: Sun Dec 12 2010, 06:03AM
Location: Albuquerque NM
Posts: 108

I tired 2 in series and finally got some sibilance of arc. So I guess I going to do 3 in series and use it to charge a Marx gen or something.

quicksilver

Tue Dec 21 2010, 06:32PM

Registered Member #1408 Joined: Fri Mar 21 2008, 03:49PM
Location: Oracle, AZ
Posts: 679

Realistically I think that may be your option. I have quite a few (I had a boat-load of these CCTV monitors to pull parts from). I tried a couple of parallel designs (nothing much better). Frankly I had enough (6) to just string them along and after 3-4 they don't seem to do a whole lot better than 6 in a row.
I tried another experiment. I have a "mini-ZVS" (made from IRFP640's) that is just for light weight current. I compared the primary winding of a center-tap with the "primary - feedback" of the single transistor simplistic design drivers. At 12v3a the primary-feedback winding appears to get better performance than a center tap on those little guys.....for what it's worth I've put 25v through them but kept it at 3A. I did not do this for more than a few seconds as I have a feeling that's about all they will handle. I never got anything but the "stringy blue" sparks; no matter the config.

ubuntupokemoninc

Tue Dec 21 2010, 09:59PM

Banned on 1/22/2011 for repeated rule violations after multiple warnings.
Registered Member #3299 Joined: Sat Oct 09 2010, 08:11PM
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another way to tell if fbt are working, is plug them in and you should here a hissing noise, even try putting some dust on the table and put the + hv lead near the dust, the dust should move around.

or turn the lights off and see if theres corona on the core or the +hv lead.

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