Re: [TCML] C D capacitors

[Henry Hallam <henry@xxxxxxxxxxxxxxxx>]

Inductance and resistance of that many solder joints is non-negligible.

On Mon, Apr 5, 2010 at 11:27 PM, Christopher Karr
<chriskarr4@xxxxxxxxxxx> wrote:
>
> 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.
>
> Happy coiling,
>
>  - Christopher Karr
>
>> Date: Sun, 4 Apr 2010 10:31:44 -0400
>> Subject: Re: [TCML] C D capacitors
>> From: glau1024@xxxxxxxxx
>> To: tesla@xxxxxxxxxx
>>
>> 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@xxxxxxx> 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@xxxxxxxxxxxxx>
>> > Sent: Saturday, April 03, 2010 8:40 AM
>> > To: <tesla@xxxxxxxxxx>
>> > 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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-- 
Henry Hallam

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