RE: Ampliphone HV-other options?!

> >Think 1/3 the size-even with the foucus/G2 built in!!
>
> The built in Focus and G2 was one of the reason's I thought using a
> new fly back would be cool. I imagine finding the separate Focus/G2
> assembly might also be a pain...
>
True, although I think MGM Electronics and the TV places have them. Once
again, the problem would be could you always get them...

Here's a question that's been bugging me: why do you only see those little
potted HV doublers and triplers on B/W monitors? Is there any reason that
we couldn't generate like 5-6KV off of a "standard" transformer (like for a
laser) and then feed it to a doubler or tripler? Maybe regulation is
harder?

> Clay's idea of using a GO-7 fly back is nice though, since we have all
> its spec's (well, at least a schematic of a working monitor). We
> would have to come up with the focus assembly though (Or would we? I
> don't have a GO-7 monitor, so I'm just assuming here...)
>
I think they had separate focus/screen parts. The part I liked best about
the GO-7 was that the "hard to get/hard to get specs on" parts-- the HVT and
the boost-transformer are readily available as replacment parts. (and
dozens of dead GO-7 chassis make for a nice source of parts for
experimenting. ;-)

> I just saw a thingy called "Transformer Horizontal Drive" on the Happs
> Control page
> http://www.happcontrols.com/amusement/monitors/49125000.htm
> which is most likely one of those things I've been calling a "Current
> Boost" transformer (because of what it does), and it's only $3.62.
>
I think you're right. I'm not sure what the "industry" term for those is.
We had some transformer vendors in that left us catalogs, and although some
had stuff that *looked* right, it turned out that it's more of a "what specs
do you need and we'll make 100,000 for you" type of order process.

> Another alternative to the current boost transformer would be to
> simply use more transistors to increase the current without the use of
> the transformer. This should work unless the transformer is also used
> to "round" the square wave a bit before being given to the final drive
> transistor, or if the reverse voltage that would come from the
> transformer is used to more quickly turn off the output drive
> transistor, or something else I can't think of.
>
If it's just a big-ass pulse a MOSFET would probably do nicely.

> Probably ought to
> stay with the tried and true driver that seems to be used by every TV
> made, and keep the transformer.
>
Yeah, I keep coming back to "I know enough to be dangerous" so I'm inclined
to leach as much as possible from existing designs. (In particular I was
just thinking to use the WG6100 HV design but with GO-7 parts and more
common HOTs for the boost...)

-Clay
Received on Wed Jun 9 19:15:13 1999