Does somebody want to volunteer to program a dirt cheap little programmable
microprocessor for this project?
I was originally planning on using a quad comparator misc stuff to make an
adjustable spot killer, etc...
James
----- Original Message -----
From: Clay Cowgill <ClayC@diamondmm.com>
To: <vectorlist@lists.cc.utexas.edu>
Sent: Wednesday, November 03, 1999 12:41 PM
Subject: RE: New Vector Monitor Project: DEFLECTION SCHEMATIC FOR REVIEW
> Couple thoughts...
>
> I was playing with TVS (Transient Voltage Suppressors) parts a while back
as
> a form of input protection on older WG6100 (and similar) monitors. They
> might be a worthy option for your input clamping. Super-fast turn-on,
high
> current, bidirectional... It looks to me like they could easily thwart
the
> dreaded "dead at max deflection" problem.
>
> One other idea from a few years back-- why not add a "smart" spot
> killer/supervisor? Just a little microcontroller and a couple fast
> comparitors or a little A/D or something. Have it's sole job in life be to
> sit there and watch the X and Y inputs. If it ever doesn't see axis
> crossings for more than a couple hundred milliseconds, turn off the color
> guns (spot killer). If it ever doesn't see axis crossings for more than 4
> seconds, turn off the deflection amps (transistor-saver). If it ever
> doesn't see axis crossings for more than 15 seconds, sound a piezo-beeper
> alarm. As a little extra bonus it could have four LEDs that show the
> quadrants of the monitor-- light the appropriate ones in the event of
> failure to help debugging...
>
> -Clay
>
>
Received on Thu Nov 4 15:38:03 1999
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