[TCML] MMC

[Joe Mastroianni <joe@xxxxxxxxxxxxxx>]

Progress on my first coil - 

Built an MMC from 18  942C20P1K5-F caps in series, based on the calculations for a static spark gap and a 15/30 NST.  Each cap is shorted underneath the plexiglas board by a 10M resistor.

<http://yfrog.com/edpylj>

I will not try to test the terry filter by running the primary circuit without a secondary.  Though I do need to figure out how to set the safety gap(s), which I imagine need to be tested by running the coil somehow.  Any advice on setting the safety gaps is much appreciated.

Meanwhile, I am going to pray the MMC "works", as it's simply a series connected string of caps.

By the way - I managed to find the caps on line at RS Electronics. I had to call them directly - their website would not allow for an on-line purchase.

My usual sources (Mouser, Digikey, Newark, Jameco) had none.  In fact, when I purchased from Mouser what were listed as 942C16P10-k (1600V 0.10uf),  I received 942C12P10-k (1200V 0.10uf) which I was having a hard time making work from a max voltage stand point.  At least the 1600V ones I could arrange to get the proper capacitance, but 1200 was too small, so I had to send them back.

Also, I got several caps on line that are made by a Chinese company, CJE.  They're labeled as having the value 0.01uf 20KV, 10% tol.  But after reading the various forums, I became worried about their ability to withstand the use.  So I went to the devices everyone considers the old reliable standby (the 942s). 

Cheers,
Joe




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