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Re: [TCML] RE: Primary coil supports
I've use white ABS for MMC's but for none of the reasons mentioned.
That's a mechanical/electrical reason. Wood if arced to will generate
carbon. The more often this occurs, eventually a nice black thick carbon
track will end the coils usage until dealt with. But, sealing and
"insulating" from the wood will prevent it. I've also had carbon tracks
occur in even G10. So it's not only wood. Anything can develop a carbon
track if the voltage is high enough for the material and distance (and
those carbon tracks all look the same = black, and cause the same
problem = a short).
Troy Peterson wrote:
I've used wooden primary supports on my coils with a good measure of
success... Without any sort of sealent either... however, as I believe
was recently mentioned, at a high enough voltage EVERYTHING becomes
conductive.... At the voltage levels used in our primary circuits wood
will conduct a small amount of current. there is probably some
inductive losses in it too.. Plastic will essentially be lossless. All
in all, I doubt the losses from using wood would be significant - and
if you ensure that its dry and well sealed then it should perform
every bit as well as a plastic coil form.
As for MMC construction - I think the main reason that most people use
plastic rather than perf board is that it just looks nicer. And the
holes on most standard perf board may not be big enough to accept the
mmc cap leads without some help. Also, perfboard is really flimsy and
will buckle under the weight of a load of MMC caps without good
support... But there's no reason that it can't be used.
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