Re: The magic HV unit

You need to read my Rasterhack for vector monitors...

http://www.flippers.com/vid-tips.html

John :-#)#

At 09:53 AM 12/04/2002 -0500, Bachmann, Joe C wrote:
>It has been mentioned that the yoke needs to be tuned to the HV unit. This
>should not be the case in a color vector monitor; because the deflection
>board runs the yoke and is completely independent of the HV unit.
>
>I was going to try making a HV unit from a WG 7000. This has a focus
>assembly already on it.
>
>Anyone know where to buy focus assemblies for amplifones?
>Anyone have any WG 7000 boards to get rid of cheap?
>
>Thanks,
>Joe
>
>-----Original Message-----
>From: Aaron Howald [mailto:ahowald@w-link.net]
>Sent: Friday, April 12, 2002 1:41 AM
>To: vectorlist@synthcom.com
>Subject: Re: VECTOR: Re: Bulk buy on Wintron flybacks
>
>
>----- Original Message -----
>From: "Zonn" <zonn@zonn.com>
>To: <vectorlist@synthcom.com>
>Sent: Thursday, April 11, 2002 5:05 PM
>Subject: Re: VECTOR: Re: Bulk buy on Wintron flybacks
>
>Hi folks! As some here may know, I fix TV's for a living.
>I have saved many flybacks off sets, and wrote down the pin-outs (I can post
>this again
>if needed) I can do some experiments...
>
> > The best fix would be to find a replacement for the WG HV transformer (its
> > different from a standard raster flyback HV in that it runs with a ~48v
>primary,
> > and doesn't need the kickback of the yoke to reach 19.5kv).
>
>Give me a few weeks, I have a WG 6100 HV supply to play with.
>I want to:
>1:make it run off 120VDC directly (not too hard, replace/change some part
>values?!)
>2:mod it so it runs isolated (the transformer itself may not allow this)
>3:try to hack in one of my pulled transformers out of TV's
>
>BTW, anyone have a spare WG6100 HV supply to sell? I don't care if the
>flyback is toast,
>but it should be complete(full cage+board)
>I also need to get a WG6100 Yoke too-I have nothing to trade vector related,
>we can work it out...
>
>My goal is HV with raw 120VAc in, non isolated; the B+ should not need to be
>regulated either!
>
>Many TV transformers are quite cheap, often $20-30, but some can be $80 or
>so...
>
>Oh, I read earlier about maybe using an ignition coil out of a car? I think
>the coil
>will not work at a high enough frequency for smooth power;
>HV can only be generated each "pulse" and power will sag between them...
>
> >
> > With a replacement WG HV and a focus assembly the rest of the circuit is
> > standard design and can be updated using newer parts.
> >
> > The results would be a drop in HV cage replacement for any X/Y monitor.
>(And
> > then all we'd need is a yoke wound and...)
>
>Well, not "drop in" but maybe a parts list and mod instructions?!
>
> >
> > Cost? Probably around $200 (depending upon the price of the HV
>transformer and
> > focus units, and case).
> >
> > The third solution would be to find a standard raster flyback Xfmr that
>has the
> > built in Focus assembly, and design new electronics around it. The
>problem
> > would be that it would still be about $200, but would now require a
>separate
> > isolation transformer.
>
>Maybe not-some TV's use the Flyback for isolation. The main drive winding is
>usually not connected to ANY output windings and runs off a "hot"130V B+
>The whole drive system runs on this hot ground, feedback can be through an
>opto,or
>a small aux free floating winding.
>
>Isolation may not really be a problem anymore since most TV's now use a
>switching supply
>for the B+ and almost all supplies...maybe a switching supply could be
>used?!
>
>
>I will post back results...
>Aaron Howald
>AKA Vector Viper
>
>
>
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Received on Fri Apr 12 13:55:56 2002