Flyback Transformers / High Voltage / Forums

Forums

4hv.org :: Forums :: High Voltage

« Previous topic | Next topic »

Flyback Transformers

1 2 next

Move Thread

LAN_403

Xplorer

Fri Jul 30 2010, 07:48AM

Registered Member #2416 Joined: Sun Oct 04 2009, 04:23AM
Location: Oceanside, CA
Posts: 91

Hey guys,

I salvaged this flyback from an old TV and it has this extra transformer looking thing attached to it. Do any of you know what it is and whether or not it should be left on? Is it the HV diode?

Also do you have any links to a good schematics? I've built simple transistor based circuits before but I'm after some hotter sparks now.

Thanks!

-Tony

Patrick

Fri Jul 30 2010, 08:18AM

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

thats unique, i think there are one or more diodes and atleast one cap in that extra moulded case, it coud be for pulse/waveform shaping, or a traditional CW multiplier, i dont know what you should do. i gave up on figuring out other "special" devices. i make my own transformers from the ferrite up, now largley becuase its so hard to figure out schematics and specs of salvaged stuff.

HVgeek

Fri Jul 30 2010, 08:43AM

Registered Member #2998 Joined: Tue Jul 13 2010, 08:34PM
Location: Swedish forests.
Posts: 26

That's odd... Never seen that before. Unless there are any additional leads to it I'd say it's a straight forward diode. If there are more hookup points than the big one on the top it it's probably a CW multiplier.

Amyhow, I don't think it's of any good use, so just crack it open and tell us what you find inside. That hould dispel the mystery. If you are gentle you might even keep the component functioning; the plastic is only structural.

GhostNull

Fri Jul 30 2010, 12:39PM

Registered Member #2648 Joined: Sun Jan 24 2010, 12:45PM
Location: Australia
Posts: 291

HVgeek wrote ...

Amyhow, I don't think it's of any good use, so just crack it open and tell us what you find inside. That hould dispel the mystery. If you are gentle you might even keep the component functioning; the plastic is only structural.

Somehow I don't think I would do that...

Myke

Fri Jul 30 2010, 03:40PM

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

I doubt it is a CW multiplier since those require AC to function. You can see that the flyback has an internal diode because of the rod shape on the side of it. It might be a high voltage divider for screen and focus supplies? They might have made it the way they did to decrease the likelihood of surface tracking. I'm not sure though.

radiotech

Fri Jul 30 2010, 05:45PM

Registered Member #2463 Joined: Wed Nov 11 2009, 03:49AM
Location:
Posts: 1546

It is a high voltage multiplier with focus divider. here are the typical schematics from NTE 11.

edit: try going to the NTE site and entering the numbers on it.

Sulaiman

Fri Jul 30 2010, 06:14PM

Registered Member #162 Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3141

Some crt have an external eht capacitor as well as the internal (wall) capacitance,
I think it's just an eht capacitor.

Arcstarter

Fri Jul 30 2010, 07:14PM

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

I have seen different kinds of potted stuff, such as rear projection screen TV's have a box like that which is a HV splitter. The input is connected to an internal capacitor (3nf 30kv is what you will usually find), and there are 3 outputs, each connected with their own resistor.

I do not think it is a multiplier... Like Myke said, that is almost surely a DC LOPT.

My guess is that yours is just cap block

. Maybe a resistor too.

Proud Mary

Fri Jul 30 2010, 07:26PM

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

I'm sure radiotech is right, and the mystery object is a voltage multiplier module.

I looked in my junk pile to see if I could find one like it. I couldn't, but found seven other types in five minutes of rummaging, and could have found more if I'd put some effort into it. Some are doublers for black and white CRTs, but most are the triplers needed for colour. You can even see the C&W
zigzag in the bright blue one at left of centre.

1280517364 543 FT0 Tv Eht Multipliers 002 Small

These modules were the intermediate technology between EHT diode sticks like these, which you could unplug and replace when they failed, and the completely encapsulated diode split LOPT, which we all know and love today.

1280517387 543 FT0 Tv Eht Multipliers 003 Small

Arcstarter

Fri Jul 30 2010, 08:55PM

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

Proud Mary wrote ...

I'm sure radiotech is right, and the mystery object is a voltage multiplier module.

I looked in my junk pile to see if I could find one like it. I couldn't, but found seven other types in five minutes of rummaging, and could have found more if I'd put some effort into it. Some are doublers for black and white CRTs, but most are the triplers needed for colour. You can even see the C&W
zigzag in the bright blue one at left of centre.

I just geeked myself.

1 2 next

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