Re: Electrostatic deflection?

We have discussed re-winding. The x coil has no torroid while the y does.
-James

----- Original Message -----
From: Christopher V. Moore <cmoore@heartlab.com>
To: <vectorlist@lists.cc.utexas.edu>
Sent: Friday, October 22, 1999 9:54 AM
Subject: Re: Electrostatic deflection?

> At 08:57 AM 10/22/99 -0400, you wrote:
> >
> >I fully admit that I'm out of my league in these discussions...don't
> >let these musings slow anyone down...
> >
> >I was thinking about the yoke issue, and am wondering if it's
> >feasable to modify a vector (or raster) monitor to do electrostatic
> >deflection. I think this is what oscilloscopes do.
> >
> >I can see a nice, simple assembly of four plates replacing a yoke,
> >but I'd imagine you would need higher voltages to acheive decent
> >deflection. After all, oscilloscope tubes are long and skinny.
> >I think the nice part would be driving a high impedance instead of a
> >low one...
> >
> >Is this possible or am I just dreaming? ;)
> >
> >Thanks,
> >Frank
>
> Although possible, I don't think that it is a good choice. Way back
> when I was in college, my Emag Fields professor talked about the using
> plates verses yokes for deflection in a tube. The plates are a lot
> slower than using a yoke. He was an old school EE and his first job
> was yoke design. It has to do with the fact that you have move all
> that charge onto and off of the plates.
>
> I'm suprised noone has talked about just rewinding an existing yoke. If
> you are going to refit a raster monitor, the yoke form is already there
> and the geometry is already done. I think that just cutting off the
> old yoke wires and rewinding for vector is the way to go. Correct me
> if I'm wrong, but I believe that the X coils just divide the toroid in
> half vertically with each coil taking one half and the Y coils are just
> wrapped on top dividing the toroid in half horizontally.
>
> To find the number of turns can be done by counting up the number of
> turns on an existing monitor or just a couple of plug and chug equations
> since we know the inductance and wire size of an existing yoke.
>
> -Chris
> --
> Christopher V. Moore -- Principal Engineeer
> Heartlab, Inc. - 101 Airport Rd - Westerly, RI 02891 -- www.heartlab.com
> Phone: (401) 596-0592 x113 - Fax: (401) 596-8562 - Email:
cmoore@heartlab.com
>
>
Received on Fri Oct 22 09:26:55 1999