[TCML] C D capacitors
chriskarr4 at hotmail.com
Tue Apr 6 00:27:44 MDT 2010
Well, if the capacitors can easily handle one-hundredth the pulse-current and cost five cents apiece at the same voltage and one-hundredth the capacitance, they are cheaper than a single 942C20P15K-F (yes, I have the part-number memorized and know what each portion of it represents...) and have even better characteristics for the same price (this is, of course, assuming that one isn't making a bulk-purchase of the 942's).
Now, the labour involved in assembling one-hundred capacitors to make the equivalent of one CDE cap (plus the cost of solder) is another story all-together.
If you're like me and enjoy both, saving money and soldering, it's a win on both accounts. The only losing portion of such a situation is the size which this array would require, due to its having a poor volume:capacitance ratio. The majority of it would, likely, be HV insulation which isn't the dielectric.
- Christopher Karr
> Date: Sun, 4 Apr 2010 10:31:44 -0400
> Subject: Re: [TCML] C D capacitors
> From: glau1024 at gmail.com
> To: tesla at pupman.com
> I don't think it's correct to suggest that specifying the right
> dielectric is all one needs to get a useful cap. True, the dielectric
> should be polypropylene, but eBay is full of HV polypropylene caps
> that are not suitable for TC use. The other critical thing is how the
> cap is built - whether the plate terminations will support the very
> high pulse currents encountered in a TC. This is not a point that we
> can be flexible on.
> Regards, Gary Lau
> MA, USA
> On Sat, Apr 3, 2010 at 5:17 PM, Bill Noble <william_b_noble at msn.com> wrote:
> > they are long gone now, but I was selling similar caps for $5 cents each a
> > few years ago - I'll bet if you look around you can find them or something
> > suitable in quantity pretty cheap - try ford electronics, for example
> > (telephone, and ask for scott) - be flexible on what you want - you need
> > quantity and the right dielectric - beyond that, everything else can be
> > adjusted -
> > --------------------------------------------------
> > From: "robert massa" <massahbob at sbcglobal.net>
> > Sent: Saturday, April 03, 2010 8:40 AM
> > To: <tesla at pupman.com>
> > Subject: [TCML] C D capacitors
> >> Can anyone advise me about where to buy some cornell dubilier 942
> >> capacitors that everyone is using for mmc's. Checked a couple online sites
> >> and $6.50 seems high, but I am new to this and don't know. The salt water
> >> caps work, but...!
> >> The info I,ve gleaned from this site is priceless.
> >> Thanks, Bob
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