Re: Filters & Chokes

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

Ok so no Al clad, but on the same page of the Maplin cat. 10W ww ceramic
bodied -at-45p ea.  ten in series to give 100W, and I know these can be
over-run to double power rating for 5mins with no problem these are rated
500V dc (1kV peak)
----- Original Message -----
From: Tesla list <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Wednesday, November 15, 2000 2:18 AM
Subject: RE: Filters & Chokes


> Original poster: "Lau, Gary" <Gary.Lau-at-compaq-dot-com>
>
> 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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