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Re: HV power supply

Original poster: "Dale Nassar by way of Terry Fritz <twftesla-at-qwest-dot-net>" <dnassar-at-i-55-dot-com>

You already have what you need!!  My quarter shrinker consists of two 
paralleled 70uF-at-12kV capacitors (140uF -at- 12kV total  or over 10kJ!)  The 
only problem I can think of that may be in your setup is those diodes--they 
may me dropping way too much voltage.  I use a 15/60 NST to charge my bank 
in just a couple of minutes.  Use the formula T = CV/I  for an 
approximation of charge time.  Also, I am a bit paranoid about my diodes 
and I use a series of about (12) 6kV units.  You don't need a filtered 
power supply (a real waste of money here) because your giant capacitors ARE 
the filter.  It's best to use a variac and meter to be safe.   Keep in 

Let me know if you have any specific questions.



At 08:41 PM 5/11/02 -0600, you wrote:
>Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>" 
>Hey all,
>I'm sort of looking for a decent metered, filtered HV power supply
>without spending a  fortune. I am looking for something that
>can put out at least say 20 kVDC at at least 10 mA. I've been
>looking on ebay some for this but it seems hard to find exactly
>what i'm looking for for under $300, especially when you start
>figuring shipping. I'm needing something like this to charge my
>(2) 100 uFD, 10 kV energy discharge caps for my quarter shrinker
>safely within a reasonable time frame ( < 2 minutes for a 10 kJ
>charge is what I'm aiming for). I'm no engineer, but I know that you
>can charge a cap a lot faster if the supply voltage is considerably
>higher than the voltage that you are trying to charge the cap to,
>so long as you quit charging when the cap reaches its rated voltage.
>My current charger uses (2) 15/30 NSTs full wave rectified thru (2)
>diode sticks from an x-ray tranny to the center tap ground of the
>NSTs. Even when fed by a variac with 140 volts, these output DC
>voltage with the load of charging these caps dosen't get much above
>10 kV, so I can charge the caps to say 80% of their rated voltage
>within a couple of minutes but it takes almost forever to fully charge
>them to 10 kV :-(
>Anyway, a nice little HV power supply like Terry has would be nice :-)
>Anybody got an extra HV supply that they would like to sell to a good
>home for a reasonable cost? Or can someone point me in the right
>direction for obtaining one?
>Spark Safely,
>David Rieben