RE: Superior Power Supply

["sundog" <sundog-at-xxxxxxxxxxxx> (by way of Terry Fritz <twftesla-at-xxxxxxxxxx>)]

Hi all, Dan,

  I've tinkered with DC suplies on my TC, with about the same sparklength on
either system.  Power consumption was a bit smoother on the DC setup, but I
found the problem was the ripple in the DC from rectification.  That, and
the kickback from the gap into my diode strings kept blowing them, despite
running each leg at 2.5x the peak voltage.  I used 1N4007 (1kv1A) diodes, in
strings, unpotted.  Full wave, and half wave.  Full wave ran much better.
True, with DC you can discount resonant rise and just stack up caps till you
get the best results at a certain breakrate.  I elimenated the saftey gap on
the rotary (i know, bad idea), but at low BPS it tended to fire once, then
continue firing till I powered it all down.
  For precision testing, I'd love a commercial DC supply (like Terry's 100kv
unit!!!). But for the nastiness of TC's, give me a $38 bag of 1000 diodes, a
bag of 1000 10mohm resistors, and a few hours to solder...now..if only
someone would give me the formula to determine how big of a cap I need to
smooth out the ripple in the DC powersupply.  I have 100 1.2kv .2uf
polyester caps lying around that would work great in this application! Not
for a tank cap, but for smoothing the ripple.  I guess microwave caps would
work also.  I was just going to stack caps to the necessary voltage, then
put in as many strings as I can.  With the bypass caps and resistors to
balance the load, i can't see them getting too much RF, and they should soak
most of it up before it hits the diodes.
  Ideas?  Comments?  Suggestions?  That darn formula?
												Sundog


-----Original Message-----
From: Tesla list [mailto:tesla-at-pupman-dot-com]
Sent: Tuesday, November 14, 2000 9:42 AM
To: tesla-at-pupman-dot-com
Subject: Superior Power Supply


Original poster: "Dan Kunkel" <dankunkel-at-hotmail-dot-com>

Tesla Fans,

I have been considering the advantages of using a high voltage DC power
supply to power a coil.

The reason I think it would work better is the fact that you could use a DC
motor to control the gap break rate and not have to worry about it being in
sync with the 60 hertz sine wave. Tesla and other modern day coilers have
noted the benefits of having a large bang size and low break rate.

So where do you draw the line? Maybe your coil would perform best at 81.7
bps instead of the syncrounous 120 bps. As long as your primary capacitor is
large enough, you can keep driving your bps down.

I think the optimum bps would be more closely related to the frequency of
the coil than anything else.

I would imagine that any modern day HV DC supply would be heavily
transistor-ized and not behave well with the RF/EMI produced by the coil.

Where could one find one of these (cheaply) without haveing to build your
own dynamo? I found one company on the web that sells HV DC supllies (and
will custom make you one to your specs)...outrageous pricing too. Voltages
anywhere from a few KV to 30KV, and only a few MICRO-amps.

Comments?

Dan
_________________________________________________________________________
Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail-dot-com.

Share information about yourself, create your own public profile at
http://profiles.msn-dot-com.