Re: Vintage 10,000 volt DC 1ma supply for sale.

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Paul Marshall by way of Terry Fritz <teslalist-at-qwest-dot-net>" <klugmann-at-hotmail-dot-com>

Mathematically, you may be correct. However my quarter shrinking experience 
has taught me a valuable lesson on losses. At some point in the charging 
cycle you will find the voltage on the cap stalling. For instance I had a 
bank of 30kV 15 uF (3)caps. If I used a single 15 kV 30ma transformer the 
max voltage the cap would see was about 10 kV. It wasn't until I started 
using the pole pig that I acheived full charge. I guess the message here is 
that Losses are a reality and if you only have a single ma at 10kV you 
aren't going to do a lot of charging.


Feel free to contact me, about quarter shrinking. I have a lot of 
experence.....


Paul S. Marshall




>From: "Tesla list" <tesla-at-pupman-dot-com>
>To: tesla-at-pupman-dot-com
>Subject: Re: Vintage 10,000 volt DC 1ma supply for sale.
>Date: Sun, 23 Feb 2003 08:34:03 -0700
>
>Original poster: "John Richardson by way of Terry Fritz 
><teslalist-at-qwest-dot-net>" <jprich-at-up-dot-net>
>
>
>Hello,
>To those of you who were at the Cheesehead Teslathon, you may remember how
>long it took to charge Sam Barros' cap bank for the rail gun, and if I
>remember correctly, that was with a 15/30 ma NST.  seems it was on the order
>of fifteen minutes or so.  Just for perspective.
>John Richardson
> >
> > In a message dated 2/21/03 9:12:04 PM Pacific Standard Time,
> > tesla-at-pupman-dot-com writes:
> > >However I don't
> > >think (I could be wrong, and frequently am) but I don't think that you
> > >could crush coins with it. There isn't enough amperage to maintain the
> > >charge in the cap/charge it fast enough to make it work.
> > >
> > >
> > >
> > >Christopher "Duck" Boden Geek#1
> >
> >
> >
> > Duck, Captain, all,
> >
> > Sure, you could charge a quarter shrinker cap with a 10 kv, 1 mA power
> > supply, but that would depend on how long that you want to spend
> > charging up the huge capacitor for the one-time discharge pulse to
> > shrink the quarter, crush the can, ect. I figure that at only 10 vA per
> > second it would take 1000 seconds (nearly 17 minutes) to fully charge
> > a 10 kJ capacitor, in the best case scenario. I know that it's not quite
> > as simple as just that and that it would likely take even longer.
> > And if the cap tended to leak off a little of its charge, you may never
> > be able to fully charge it.
> >
> > Sparkn' in Memphis,
> > David Rieben
> >
> >