Re: MMC resister problem

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Terry Fritz" <twftesla-at-qwest-dot-net>


Hi Steve,

1/2 watt 10Meg metal film resistors are good to about 2000 volts.  Near
4000 volts they tend to burn up.  If your using 1/4 watt, you probably
don't want to go over 1000 volts each.  So you do need two or probably
three times the number of resistors.  If they are arcing now, go with three.

Cheers,

	Terry


At 01:42 AM 6/2/2002 -0500, you wrote:
>Hi everyone,
>
>My friends large coil project has been having problems with the cap and im 
>hoping someone could give me an answer.  Here are the specs for his MMC cap:
>
>caps are green Russian military caps.  .0047uf-at- 16kvdc each.  We wired them 
>into strings of 3 in series, with 30 strings in parallel.  Thats a lot of 
>caps!!
>
>Now we only have a single 10meg ohm resister across each cap, and the 
>problem is that these cheap radioshack resisters are starting to arc between 
>the leads.  I have a feeling that its because 1) they are not rated for HV 
>and 2) we only have 3 caps in series, so its alot easier for it to arc 
>across 3 resisters, rather than the 7-10 that a normal MMC would have.
>
>So...  would i be able to fix this by putting 2 resisters across each cap?? 
>or would we need more like 3 on each cap?
>
>Any other suggestions are welcome.
>
>Steve Ward.
>
>