Re: Comments on my coil?

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

Original poster: "Dave Lewis by way of Terry Fritz <teslalist-at-qwest-dot-net>" <hvdave-at-earthlink-dot-net>


Thanks Gary,

I've seen your excellent web pages and was inspired by your "pool-toy"
toroid.

So now I've got a nice pool toy thats a just little bigger than my
current toroid.  I was thinking of covering it (pool toy) with first a
thin layer of paper mache, then strips of light weight linen soaked in
polyester resin (aka fiber glass), and finaly then applying some kind of
sandable filler to smooth out all the imperfections.  That hopefully
will be stiff enough to coat with the aluminum tape and burnish to a
smooth surface.  I figure the paper mache layer will keep the polyester
resin from melting the pool toy while its curing.

You are absolutely right about the EMI filter vs NST protection filter
terminology.   I'm a power supply designer by trade and we always call
the "thing-a-ma-bob" that sits between the line and converter an EMI
filter, just out of habit.

Dave Lewis



Tesla list wrote:
 >
 > Original poster: "Lau, Gary by way of Terry Fritz <teslalist-at-qwest-dot-net>" 
<gary.lau-at-hp-dot-com>
 >
 > Hi Dave:
 >
 >  >So heres A few ideas I had.....
 >  >  - make a nice smooooth toroid so only one arc is emitted instead of the
 >  >     3-5 I get now.
 >  >  - put some PF correction caps in front of the NSTs on the 120VAC line.
 >  >  - modify the EMI filter to use a lower series resistance value.
 >  >  - rebuild by SRSG to use smaller electrodes for a shorter "apeture"
 >  >    time.
 >
 > I agree that your best bet to improving things lies with improving your
 > toroid.  PFC's won't affect performance, unless your mains power is sagging
 > due to losses in the house wiring.
 >
 > Your "EMI" filter should be called a NST protection filter; it is not
 > intended to reduce EMI sent to the mains.  But I agree that lowering the
 > resistor value will reduce un-necessary losses there and improve
 > performance.  You may also want to consider eliminating the series
 > inductors, as these have been shown to cause more trouble than they
 > solve.  If you want to diminish EMI going back to your mains wiring, you'll
 > need an EMI filter on the primary side of your NST.
 >
 > Regards, Gary Lau
 > MA, USA