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Re: MMC Capacitors from Dr. R.



Original poster: "S&JY" <youngsters@xxxxxxxxxxxxxxx>

Mike,

Good point.  I should have included the STK specs for the two caps.  They
are:

0.15 uF 2 KV   Ipeak = 144 amps, Irms = 8.9 amps
0.10 uF 3 KV  Ipeak = 144 amps, Irms = 8.1 amps

So they are roughly the same Irms.  Probably you will have more strings of
the 3 KV caps anyway to end up with the same capacitance of a 2 KV cap MMC.
You can find the complete specs for these caps at www.stkelectronics.com.
Look in the MP89 series specs.
--Steve Y.


----- Original Message ----- From: "Tesla list" <tesla@xxxxxxxxxx> To: <tesla@xxxxxxxxxx> Sent: Thursday, December 02, 2004 6:08 PM Subject: Re: MMC Capacitors from Dr. R.


> Original poster: "Virtualgod" <mike.marcum@xxxxxxxxxxxx> > > True, but don't you have to consider the Irms rating as well? If the 3kv > ones have a much lower Irms rating (not sure what it is, but the 2kv ones > have like a 8A rating without getting too warm) then more strings would be > needed. Plus you have to consider what voltage/ capacitance rating you are > shooting for. I think there's a MMC calculator somewhere (I think it was on > the geek group site, can't remember) where you input calculated specs/cost > of what you need and the individual cap's spec/cost and it gave you the > cost of the array made from a given cap. > > Mike > ----- Original Message ----- From: "Tesla list" <tesla@xxxxxxxxxx> > To: <tesla@xxxxxxxxxx> > Sent: Thursday, December 02, 2004 10:05 AM > Subject: MMC Capacitors from Dr. R. > > > >Original poster: "S&JY" <youngsters@xxxxxxxxxxxxxxx> > > > > > >For those contemplating buying either the 0.1uF 3KV or 0.15uF 2KV caps from > >RRC, here is some food for thought. > > > >At rated max volts, which caps will give you more bang for the buck? Let's > >do the calculations: Joules = 0.5*C*V*V. The 2 KV cap will store 0.45 > >Joule, and the 3 KV cap > >will store 0.3 Joule. Ya gotta love the V^2 factor! > > > >Clearly for the same cost, the 3 KV caps are a much > >better bargain. Saying it another way, your MMC will cost significantly > >less if made with the 3 KV caps. > > > >--Steve Y. > > > >----- Original Message ----- > >From: "Tesla list" <tesla@xxxxxxxxxx> > >To: <tesla@xxxxxxxxxx> > >Sent: Wednesday, December 01, 2004 7:53 AM > >Subject: Re: Capacitors > > > > > > > Original poster: "Dr. Resonance" <resonance@xxxxxxxxxx> > > > > > > > > > We stock STK caps in 0.15 uF at 2 kV and 0.1 uF at 3 kV. We also > > stock > CD > > > caps in 0.15 2 kV. > > > > > > Two in parallel with give you 0.3 at 2 kV or you can use three 0.1 uF > > 3 > kV > > > units in parallel to obtain 0.3 uF at 3 kV. > > > > > > Contact me off-list if you need some. > > > > > > Dr. Resonance > > > > > > > > > >