RE: terry's nst filter:power res overheating?

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

Original poster: "Cajun Coiler by way of Terry Fritz <twftesla-at-qwest-dot-net>" <cajuncoiler-at-cox-dot-net>


Ahh, so it's a set of high wattage resistors we need
to keep from blowing out our NST's ?

---
C.L. Mayeux
Owner, MSB Data Systems
poohbear1961-at-cox-dot-net
http://www.msbdatasystems.tk


> -----Original Message-----
> From: Tesla list [mailto:tesla-at-pupman-dot-com]
> Sent: Wednesday, September 18, 2002 12:23 PM
> To: tesla-at-pupman-dot-com
> Subject: RE: terry's nst filter:power res overheating?
>
>
> Original poster: "Mccauley, Daniel H by way of Terry Fritz
> <twftesla-at-qwest-dot-net>" <daniel.h.mccauley-at-lmco-dot-com>
>
>
> Actually, this is completely wrong.  Although "some" power resistors can
> heat to the point where they glow red, there are a large number of power
> resistors which CANNOT take these type of temperatures.
>
> Also, although a resistor may be able to take 350C, the components or
> enclosure around it may not.  For example, 350C will definitely damage a
> FR-4 board and unsolder nearby components.
>
> Dan
>
>
>
> Hi Larry,
>
> Power resistors are basically space heaters.  At full power they can run
> 350C or slightly glowing hot!  I use much larger power resistors than
> needed to keep the temp fairly sane but they will still get hot for sure.
> The heating you see is perfectly normal.
>
> Cheers,
>
> 	Terry
>
>
> At 01:25 AM 9/18/2002 +0000, you wrote:
> >I wired the unit up tonight.  less interferrence than the choke
> filters i
> >was using. coil output seems slightly better.  but the problem
> is the power
>
> >resistors are heating up a bit more than I would like.  I am using
> >2 12kv 30ma nsts.  my gap is way maxxed out at somewhere just
> under 1/2".
> >I'm assuming that the gap being wider than it should is probably causing
> >overheating. the power resistors after 10mins of testing were
> about 110-120
>
> >degrees F.  the safety gap fires occasionally. any ideas?
> >I could post a link to a picture of the board plus the wiring layout i
> >chose.  none of the other components are showing any signs of heating.
> what
> >is the limit of the heating of the power resistors? perhaps 150F ?
> >am i just overreacting?
> >
> >larry.
> >
> >
>
>
>
>