The R and C values in a Terry low-pass filter are not at all critical,
since it's not really tuned to any particular frequency. 1000 Ohms is a
fine nominal value. Energy wasted as heat increases with increasing values
of R and C. Filter effectiveness also increases with increasing values, so
it's all a trade-off.
Regards, Gary Lau
MA, USA
On Sun, Sep 13, 2015 at 1:33 PM, wt5y <wt5y@xxxxxxxxx> wrote:
>
>
> Ok thanks, mine are 1000 ohm, how low and high can that vary?
>
>
> Sent from my Samsung GALAXY S5™, a Cricket 4G LTE smartphone
>
> -------- Original message --------
> From: Gary Lau <glau1024@xxxxxxxxx>
> Date: 09/12/2015 11:16 (GMT-06:00)
> To: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
> Subject: Re: [TCML] terry filter resistors
>
> Correct - you don't want an aluminum-encased resistor on a device intended
> to standoff high voltage transients. The DougDeals resistor looks like a
> good deal.
>
> On Sat, Sep 12, 2015 at 9:55 AM, Doug <doug11642@xxxxxxxxxxx> wrote:
>
> > Hi John; Try this company and VARISTOR-- Mouser Electronics
> >
> >
> http://www.mouser.com/ProductDetail/KOA-Speer/NVD10UCD1800/?qs=sGAEpiMZZMuQmL5N8IqpX60p22ayIdHXFuxHkI%252bpoGQ%3d
> > Also, and I cannot qualify this, but I read somewhere that the aluminum
> > encased Res. were not suitable for TF use.
> > Try this site for Res.
> >
> http://www.dougdeals.com/p-2471-2pcs-100-watt-875-ohm-vitreous-enamel-resistor-100w-nr.aspx
> > Doug
> >
> >
> > On 9/12/2015 12:01 AM, John Cooper wrote:
> >
> >> My terry filter uses Dale HL-100-06Z 1k ohm 100w 5% resistors (2) one
> on
> >> each leg. Ive been searching ebay for more and they run $10+shipping
> and
> >> only a couple NOS can be found. How much can the resistance value vary
> and
> >> still work if I stay at 100W?
> >>
> >>
> >>
> >> Also I found these cheap (half price) on ebay from China they are rated
> >> for 1k ohm and 100w 5%. They are small only 3 inches long compared to
> the
> >> above 6.5 inches but they covered in an aluminum heatsink. I see no
> reason
> >> why they wouldn’t work but figured I better ask here first.
> >>
> >>
> >>
> http://www.ebay.com/itm/1PCS-High-Power-1000-Ohm-1K-100W-Watt-Aluminum-Shell-Case-Wirewound-Resistor-5-/141509835156?hash=item20f2a4b994
> >>
> >> Nothing is wrong with my filter just trying to source more parts to
> build
> >> more in the future.
> >>
> >>
> >> John Cooper
> >> _______________________________________________
> >> Tesla mailing list
> >> Tesla@xxxxxxxxxx
> >> http://www.pupman.com/mailman/listinfo/tesla
> >>
> >
> > _______________________________________________
> > Tesla mailing list
> > Tesla@xxxxxxxxxx
> > http://www.pupman.com/mailman/listinfo/tesla
> >
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