RE: Bleed resistors for MMC caps

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

Original poster: "Tristan Steele" <ozonejunkie-at-westnet-dot-com.au> 

Hi There,


I know that here in Australia, RS Components sell HV Resistors for AU
64c each.  I believe that they are a multinational company, and do exist
in the USA.  These resistors are rated to 3500VDC, more then the
942C20P15K's.  It may be worthwhile looking into them, because 3
resistors per cap is messy, but all increases the chance of a failure.

Try http://www.rs-components-dot-com/index.html.


Good Luck
Tristan

-----Original Message-----
From: Tesla list [mailto:tesla-at-pupman-dot-com]
Sent: Saturday, June 05, 2004 10:30 AM
To: tesla-at-pupman-dot-com
Subject: Bleed resistors for MMC caps

Original poster: Chris Cudahy <ccudahy-at-yahoo-dot-com>


   I'm collecting parts for an MMC cap. I've going with
942C20P15K's for the caps but I'm not sure what to use
for bypass resistors. The 1/2 watt 10M ohm seems to be
reasonable but I can't find a resistor rated for 2000
volts - 350normal/700max is the most I can find.
   Which leaves me with 2 options:

a) Wire up 3 3.3M Ohm resistors in series across each
cap. Hit just under the max overload voltage of 2100V
combined.

b) Wire one 10M Ohm resistor,  (someone has mentioned
10MH-ND) and wait for smoke.

   I'd rather not have to wire 3 resistors to each cap,
has anyone had any failures with option b?

   (BTW, what the heck is the point of making a 0.5 watt
resistor in 10M ohm if it's limited to 0.12 watts by
it's working voltage?)

Chris