Re: filter capacitor question

• To: tesla-at-pupman-dot-com
• Subject: Re: filter capacitor question
• From: "Megavolt Nick" <tesla-at-fieldfamily.prontoserve.co.uk> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)
• Date: Sun, 19 Mar 2000 15:07:04 -0700
• Approved: twftesla-at-uswest-dot-net
• Delivered-To: fixup-tesla-at-pupman-dot-com-at-fixme

Hi Mike,
             try ebay - there's a 5.5µF 10kV pulse cap up now for $50

> Original Poster: "Mike Nolley" <mnolley-at-mail.slc.edu>
>
>     I have a question about filter caps.  My CW, Poulsen driven coil
> requires two
> large inductors as a part of the oscilliatory circuit, and I just realized
> that a
> large filter cap between the 20kv supply and the inductors would be
> necessary.  I
> have figured that each would need to be about .5 uf given the relatively
> small size
> of the primary capacitor (.001 uf)  The problem is,  I have no idea where
I
> would
> get a 10kv 1uf rated cap, let alone 2 even if they were rated DC.
>     I have a thought though-- the doubling power supply utilizes four 4kv
2 uf
> capacitor arrays--do they act as de-facto filter capacitors, even though a
> bank of
> diodes and an RC filter separate them and the charging reactors?
>     A second thought--perhaps I should lower the entire operating voltage
> to 4kv,
> operating all of the Mots in parallel, back to back, and thus avoiding the
cap
> problem.  Commercial Poulsen-Arc radios operated on less than 2kv, I
assume
> mine
> could stand 4.  It would probably simplify the circuit, though it would
> multiply
> the heat generation problems later when I design the gap.  ; )
>          I would appreciate any comments.
>                             --Mike
>
>
>

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