Original poster: "Peter Terren" <pterren@xxxxxxxxxxxx>My first thought was : What is Bill doing making such a small coil? Is it a toy one for Xmas. Perhaps the Griffith Observatory (which you are doing if I recall) needs one for a small room like a toilet or broom cupboard?
Resistors for MMC have been debated many times. Some people don't use any. Most use a single 1/2 watt 10M resistor per cap. This has always worried me as it is way overvolting the resistors rating of perhaps 500 - 800 V but in this pulse application they don't seem to fail. Terry uses 4.7M x 2 per cap. I use 3.3M x 3 per cap. I don't think it has been proven who is right. My guess is it depends on the application. For home use they are probably not required for a small coil. For a reliable larger museum coil you need to minimise failure modes, so use 3 or more.
Peter http://tesladownunder.com
------- Forwarded message follows ------- From: Self <wysock@xxxxxxx> To: Terry Fritz <vardin@xxxxxxxxxxxxxxxxxxxxxxx> Subject: bleeder resistors used with MMC Date sent: Thu, 02 Nov 2006 11:07:53 -0800 Terry, I've spent a lot of time surching the List archives and so far have not found an answer to my question. What would you recommend as the best size (in megohms I would presume), and wattage level to use with an MMC stack? I just bought 12 of the CD-942's and will be using all of them in series for a final cap rating of .012 mfd. I know many folks have used resistors to equalize the voltage distribution in these series strings. Unfortuantely, I never saved any of those posts to the List. Any help or advice you can give will be greatly appreciated. Best regards, Bill Wysock. ------- End of forwarded message -------