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 Wed Nov 3 11:42:30 1999
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