18 Oct
2008
18 Oct
'08
12:21 a.m.
On Friday 17 October 2008, Tony Duell wrote:
66 Megohms? I think yoy're likely to exceed the voltaeg rating and
cause flashover long before it burns out by dissipating too much
power.
Really? If my calculations are correct :), a 1/2 W resistor is would
only need to be just under 6000V to exceed the wattage rating, and I
think would be physically large enough to avoid flash-over in dry air
(30V per mil works out to 0.2in of gap at 6000V). A small neon sign
transformer should do the trick... Based on the my recollection of the
common size of 1/2 W resistors, (~1cm), you should be able to go up to
10kV or so, giving you 1.5W, and a good margin to help burn out the
resistor, in dry air.
In any case, you should be able to increase the gap between the leads
(and voltage rating) of the resistor by encasing it in paraffin or
epoxy.
Pat
--
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Try sacrificing a blue-blue-blue resistor by overdriving it until
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