RE: Richard Quick/flyback Xformers

To: tesla-at-pupman-dot-com
Subject: RE: Richard Quick/flyback Xformers
From: "Robert W. Stephens" <rwstephens-at-ptbo.igs-dot-net>
Date: Sat, 8 Jun 1996 21:11:28 -0500
>From baronin-at-post.crc.cra-dot-com.auSat Jun  8 08:17:51 1996
>Date: Fri, 07 Jun 96 13:09:00 EST
>From: "Baroni, Nicholas" <baronin-at-post.crc.cra-dot-com.au>
>To: engtes <tesla-at-pupman-dot-com>
>Subject: RE: Richard Quick/flyback Xformers


>Hi all,

>Some of the horizontal output / flyback transformers I have
>encountered, particularly on the more modern TV's has an
>inbuilt voltage multiplier - rectifier (Cockcroft - Walton)
>hence there is a string of diodes and capacitors between the
>winding and the output terminal. Then you won't read any DC
>conductivity to anywhere. These transformers tend to be
>completely potted, with a rectangular section somewhere on
>the housing that houses all the caps and diodes. Is your
>transformer like this?

>The HT  winding on these things tends to be an extension of
>a winding that is used to obtain a main rail voltage in the
>set - but there are exceptions to this.

>So more likely than not, you could find the "other end" of
>the winding by connecting to any of the pins connected to
>the winding with highest resistance since this winding
>typically supplies 120 - 180 V DC to the scan circuitry
>of the set.

>    MMMMM-MMMMMMM-MMMMMMMMMMMMMMMMMMMMMMMMM----Multiplier------ Out.
>    |    |       |                              |
>    |   Taps                                    |
>    |-----This end, internal to multiplier------|
>          connected back to start of winding

>The fact a rectifier stands in the way may be bit of a bummer though.

>Hope this helps,

>Nick B.

>><snip>
>>Another thing, which is probably obvious to everyone else. I got hold of a
>>flyback transformer and hoped to build a solid state coil from it. (Heavy
>>duty stuff is impossible in my current accommodation!). Anyway, I ordered
>>all the bits and made it, only to discover that the flyback transformer HT
>>lead lacked continuity with any of the other leads on the thing!

>>It serves me right for assuming everything would go okay!

>>Cheers
>>Phil Mason

Hi All,

I ran across those annoying diodes epoxy potted inside the outer 
periphery of a flyback transformer in a 12 volt DC powered computer 
monitor circuit.  I wanted to use this circuit as was, and I 
eventually did, to power a plasma globe.  It took several days, applying a
heavy duty  paint stripper to the epoxy covering of the flyback around where
the HVDC lead had come out, soaking, let sit, carve & scrape, coat & soak 
etc., but I finally unearthed that damn diode and was then able to solder a
shorting wire across it. 

If I had spent the same amount of time building a small air core 
Tesla coil from scratch that I merely spent unearthing that damn 
diode, I would have had a much more powerful plasma globe supply in 
the end.

Ever hear of the Law of Diminishing Returns?

Roll 'yer own!

Happy Coiling!, rwstephens