Sure! Be my guest. I'd be happy to be in the FAQ.
I've got to argue a point, if you don't mind. I wouldn't worry about
internal arcing, since resistors of this high a resistance are carbon (I
wouldn't use anything but carbon in this case) and would have high
resistance to arcing, in and of themselves. The innards are all resistance.
The "high voltage resistors" I've seen in the carbon-wire kind have only
been down in the low kilohm variety, like a heater wire wrapped around a
ceramic core, and used in TV Transmitters. The potentials inside
transmitters I've worked on are around 5kvDC at somewhere around 8A.
Needless to say they got warm. They're also very long (8 inches to a foot
or so in length) and very fragile.
If the resistor arc internally, it's because the resistor itself is
completely blown out. It's something you worry about with a
constant-current device. If you have a good 3- or 4-watt carbon resistor,
you'll have one that's about 3/4 of an inch long. Just insulate the leads
and you'll be fine.
The air-space a 30kV potential will arc to is around one centimeter, or
about 3/8 of an inch. Since CRTs are less than that (max around 25kV),
anything more than that length will do you fine. Just remember to insulate
the ends with silicone or monitor putty if you have it.
Take care,
John
p.s. for some great high voltage information, check out "Jochen's High
Voltage Page" at
http://www.mathematik.uni-marburg.de/~kronjaeg/hv/index.html -- it won't let
you down!
-----Original Message-----
From: John Robertson
Subject: Re: VECTOR: Bleeder Resistors and the Zen of Monitor Discharge
Excellant description, do you mind if I add it to my monitor removal
instruction page?
John :-#)#
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Received on Mon Apr 24 01:38:38 2000
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