Re: rectified nst's and hookup

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

Original poster: "Kevin Ottalini by way of Terry Fritz <twftesla-at-uswest-dot-net>" <ottalini-at-mindspring-dot-com>

Marc:
	I assume that the "other side" of the tank cap goes to the
"other side" of the primary ...

You definitely need a limiter resistor on both legs if you do
it this way.  I usually hook ground to the "DC-" side and
run single ended:

  ftp://ftp.mindspring-dot-com/users/ottalini/highvoltage/DCCOIL/DCSCH2A.PDF

I would recommend 20K ohms to start and down to 10K once things
are stable.  I have had problems with NSTs running in a full-wave
configuration due to the floating centertap which really, REALLY
wants to be ground referenced (but you can't because it will ground
loop with only diodes).

If you need to convert, put a largeish cap in series with each AC leg
and convert to a single-stage full-wave Cockroft.  For sustained full
load with a 15kv, 60ma NST my simulator says you need around 1uFd
at ~12kv (1.414*7500vac).  These can be non-pulse type caps (I use
older oil-type).  You still need the limiter resisters to keep from
blowing the diodes.

Best,
	Kevin


----------
> From: Tesla list <tesla-at-pupman-dot-com>
> To: tesla-at-pupman-dot-com
> Subject: rectified nst's and hookup
> Date: Friday, April 06, 2001 11:15 AM
> 
> Original poster: "Metlicka Marc by way of Terry Fritz
<twftesla-at-uswest-dot-net>" <mystuffs-at-orwell-dot-net>
> 
> all,
> i built a hv bridge out of three 12kv\550ma diodes per leg giving me a
> theoretical 36kv bridge.
> my question is:
> i hooked each hv term. of the 12\30 nst to each AC leg of the bridge,
> from +dc out to tank cap, from tank cap out to one side of the sync.
> triggered spark gap, from the other electrode out to the primary, from
> the primary too the -dc side of the bridge. does this sound right?
> i never even looked at a dc tc before and would hate to blow something
> up.
> i don't want to put power to it until i get some input first.
> thanks in advance,
> marc m.
> 
>