Re: 6 questions

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

Original poster: "RIAA/MPAA's Worst Nightmare" <mike.marcum-at-zoomtown-dot-com> 

What ever you do, don't use a pig for your first project. Your first mistake
may or may not be your last. I've run cd942c's at up to 1000vac no problems
(CD says 500vac, probably if you want them to last forever). 2. 1750 rpm
will work, but not very long with nst's (the asynch surges tend to toast the
nst usually by burning conductive tracks in the tar material). If you use
nst's I'd recommend you modify it for 1800 rpm synch. I think at RF iron
cores heat up alot (to the point of cooking the windings if enough power is
available). probably better to use  a 1-2" pvc pipe with 10-12 turns on it
for each side. Trying to limit a 5-10 kvA pig with an 800va transformer will
toast the transformer, especially if the windings are rated for less than
20A (the core would saturate anyway). I think the only way to series variacs
is to have the primaries and secoondaries isolated from each other (not
autotransformer type). These types of variacs are hard to come by, heavier
for a given va rating, and more expensive. Better off getting a step-up
variac or a 120 variac with a 120-240 step-up transformer.

----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Saturday, November 08, 2003 7:42 PM
Subject: 6 questions


 > Original poster: sean <sean-at-nc.rr-dot-com>
 >
 > I have some questions:
 > 1.  For MMC capacitors, these are usually rated at 2000 volts.  is this
 > ac?  Also, do I double the value of the capacitor due to resonate rise
 > so for a 12kvac transformer I would need a 24kvac capacitor?  Is geek
 > group the best deal for these?  If I order from them do I have to wait a
 > few months?  I have a 1uF 7500vac capacitor.  Can I connect this in a
 > capacitor bank with mmc's?
 > 2.  I have a 1750 rpm electric motor.  Would this be suitable for a
 > rotary spark gap?
 > 3. Where do most people get pole pigs?
 > 4. for an RF filter, would it be possible to use iron core inductors
 > (figuring this will act as a resistor to RF losing it in eddy currents)
 > and also capacitors to the ground?  or would resonate problems arise?
 > 5. For current limiting, I have an 800VA stepdown transformer.  Can I
 > connect this in series with a pole pig, and then put a variable resistor
 > on it's secondary to adjust the current?
 > 6. Can I use 2 variacs in series on a pole pig?  What about parallel?
 > Should I just use one and range from 120-240?
 >
 > Thanks for any info, and thanks for helping me get my first coil to
 > work!
 > --
 > sean <sean-at-nc.rr-dot-com>
 >
 >