Flyback Identification/information / General Science and Electronics / Forums

Forums

4hv.org :: Forums :: General Science and Electronics

« Previous topic | Next topic »

Flyback Identification/information

Move Thread

LAN_403

Matt Edwards

Thu Jun 10 2010, 09:40PM

Registered Member #2838 Joined: Fri Apr 30 2010, 07:55PM
Location: tehachapi, CA
Posts: 333

I got two small flybacks off of ebay. (Picture below)
This is the information on the flyback.

10052337
ex5008-3 b1
PENN TRAN
WINGATE PA 8720

When I purchased them I was not aware that they were so small. The ferrire measures approx 2"x1.75".

Does anyone have any good guess as to what type of input/output voltage this thing might be rated for?

Proud Mary

Thu Jun 10 2010, 10:57PM

Registered Member #543 Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992

Oidium45 wrote ...

I got two small flybacks off of ebay. (Picture below)
This is the information on the flyback.

10052337
ex5008-3 b1
PENN TRAN
WINGATE PA 8720

When I purchased them I was not aware that they were so small. The ferrire measures approx 2"x1.75".

Does anyone have any good guess as to what type of input/output voltage this thing might be rated for?

This is a Line Output Transformer (LOPT) from a small-ish black-and-white television - perhaps a portable or semi-portable - of the EHT overwind-and-rectifier era, say before about 1965.

It looks to me as if the the filament winding - often only a single turn of thick red EHT cable - has been removed for some reason.
In its original context, this LOPT would probably have produced pulses of 7 or 8kV, but there are others here who remember this antique technology at first hand,
and are better qualified to comment than I.

If you don't destroy it by trying to draw arcs from it, or absurdly over-driving it, you could make quite a useful little Cockcroft and Walton voltage multiplier with it, which can't be done with modern LOPTs of the 'diode split' kind , which have an internal means of multiplying voltage at the heart of their design.

You can wind an alternative primary of ten turns of so on the empty leg of the core (where I suppose the EHT rectifier filament winding once was) and so drive it with transistors, or MOSFETS, at a much lower voltage than used in the original primary (buried beneath all those windings) which was designed to work with thermionic valves.

Matt Edwards

Sat Jun 12 2010, 03:46AM

Registered Member #2838 Joined: Fri Apr 30 2010, 07:55PM
Location: tehachapi, CA
Posts: 333

Proud Mary wrote ...

In its original context, this LOPT would probably have produced pulses of 7 or 8kV,

I am pretty sure that you are right about the voltage Proud Mary. I just connected a small (newer) flyback that I had sitting around. It was about the same size as the one in question. When I ran 12v through it with my mazilli zvs driver circuit it produced about 7kv according to my meter.

I just thought that you might like to know that you were right...
As far as the CW generator, although it is not what I originally had in mind, I am definitely looking into it!

cookyy2k

Wed Aug 11 2010, 11:29PM

Registered Member #3105 Joined: Wed Aug 11 2010, 11:26PM
Location: UK
Posts: 3

Hey, I too just purchased one of these off ebay, just passing and looked useful. Would it be any use to be rectified and used to power a marx generator? My cockcroft used for that purpose died a death the other day so if this would make a good replacement, two birds with one stone.

Matt Edwards

Wed Aug 11 2010, 11:42PM

Registered Member #2838 Joined: Fri Apr 30 2010, 07:55PM
Location: tehachapi, CA
Posts: 333

I would imagine that it would. Or a CW generator. If you try it let me know how it works out. I connected it to my existing mazilli driver and was disappointed with the output. I was getting only around 1000v where a more modern flyback with the same circuit was producing 30,000v. And before anyone asks... I have a 50KV meter so the readings are accurate.

cookyy2k

Thu Aug 12 2010, 12:00AM

Registered Member #3105 Joined: Wed Aug 11 2010, 11:26PM
Location: UK
Posts: 3

I'll let you know as soon as it arrives, ordered it today so have to wait while it makes it's way here via air, land or sea.

Matt Edwards

Thu Aug 12 2010, 12:33AM

Registered Member #2838 Joined: Fri Apr 30 2010, 07:55PM
Location: tehachapi, CA
Posts: 333

If you don't mind that would be greatly appreciated. I have not tried doing anything to the circuit to tune it to match the secondary. Honestly I know that it would probably help greatly but it is a bit above my skill level at this point. So until then, it is sitting on a shelf collecting dust.

U4R1A

Sun Dec 25 2011, 03:31AM

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

I just picked one of these up on Ebay. I realize that this thread is >1 year old but did you ever do anything with it? Just for future knowledge the pins on the other side of that flyback are the primary windings or a lower voltage output.

Moderator(s): Chris Russell, Noelle, Alex, Tesladownunder, Dave Marshall, Dave Billington, Bjørn, Steve Conner, Wolfram, Kizmo, Mads Barnkob