R
RST Engineering (jw)
Guest
Yes, but the real problem isn't the thickness of the "shoulder" part of the
washer that sticks down into the hole in the case, but the fact that the
shoulder doesn't stick all the way down to the backside mounting surface.
At SOME point, there will be an air gap between the screw and the
case-collector that will be the point of primary breakdown. As I vaguely
recall, the breakdown DC voltage of air at STP is something on the order of
50 volts/mil with a finagle factor for high frequency AC.
Jim
washer that sticks down into the hole in the case, but the fact that the
shoulder doesn't stick all the way down to the backside mounting surface.
At SOME point, there will be an air gap between the screw and the
case-collector that will be the point of primary breakdown. As I vaguely
recall, the breakdown DC voltage of air at STP is something on the order of
50 volts/mil with a finagle factor for high frequency AC.
Jim
I still have some mica washers in my parts drawers ;-) That plus the
fiber washer has held up well even in automotive applications
(Belleville washer to maintain tightness).
...Jim Thompson
--
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I love to cook with wine Sometimes I even put it in the food