The magic HV unit

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 08:00:27 2002