RE: Filters & Chokes

["Lau, Gary" <Gary.Lau-at-xxxxxxxxxx> (by way of Terry Fritz <twftesla-at-xxxxxxxxxx>)]

I don't recommend using aluminum-clad power resistors for NST filters.  The
resistors have to stand off tens of KV spikes.  The aluminum case will cause
it to arc end-to-end through the case, rendering the filter ineffective, if
not crispy.

Don't forget the lesson learned from MMC's!  If you can't get a single big
one, string however many 1/2W resistors you need to achieve your required
power dissipation.

Gary Lau
Waltham, MA USA

		-----Original Message-----
		From:	Tesla list [mailto:tesla-at-pupman-dot-com]
		Sent:	Tuesday, November 14, 2000 7:42 PM
		To:	tesla-at-pupman-dot-com
		Subject:	Re: Filters & Chokes

		Original poster: "Steve"
<Steve-at-g8cyerichmond.freeserve.co.uk> 

		In the UK Maplin have 50W resistors -at- £1.99 incl VAT detail
as follows,
		Current catalogue page 224
		wire wound  aluminium clad
		wkg V 1.25kV (ac/dc)
		values from 0.1 to 1000 ohms
		You can parallel or series thes to produce the values you
need.


		----- Original Message -----
		From: Tesla list <tesla-at-pupman-dot-com>
		To: <tesla-at-pupman-dot-com>
		Sent: Tuesday, November 14, 2000 2:20 AM
		Subject: Re: Filters & Chokes


		> Original poster: "Gregory Hunter" <ghunter31014-at-yahoo-dot-com>
		>
		> £80 for two 100W resistors?  That's ridiculous, even
		> for the UK.  100W wire wounds are only a few dollars
		> each in the US.  If they really are that high over
		> there, you'd be better off paying international
		> postage and ordering them from Mouser, Digi Key, MECI,
		> or one of the big parts houses over here.
		>
		> Cheers,
		>
		> Greg
		>
		> > >
		> > > Cripes
		> > >
		> > > I'm just costing out the filter as per Terry's
		> > circuit diagram
		> > >
		> >
		> (http://hot-streamer-dot-com/TeslaCoils/Misc/NSTFilt.jpg)
		> > and at the UK prices
		> > > I've found, it's gonna set me back over £110! £80
		> > of that being the 100W
		> > > wire-wound resisters.
		> > >
		> > > Any cheaper options?!
		> > >
		> > > Cheers
		> > >
		> > > neil
		> >
		> >
		> >
		>
		>
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