Re: why 4 Ohms in PARALLEL with trigger coil primary?

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

Original poster: "Barton B. Anderson by way of Terry Fritz <twftesla-at-qwest-dot-net>" <tesla123-at-pacbell-dot-net>

Hi Terry, Ted, Scott,

My guess is these resistors burned open when they were placed across the
mains if
they didn't burn up first when they were series'd. I suspect they run nice and
cool now. This is probably telling us that R isn't a requirement for operation.
Lutron's probably doing all the work.

Bart
--
Barton B. Anderson
http://www.classictesla-dot-com



Tesla list wrote:

> Original poster: "Terry Fritz" <twftesla-at-qwest-dot-net>
>
> Hi All,
>
> We have been having some (sort of off list) discussion about the 4 ohms of
> resistance across the HEI coil's primary in Ted's plans...  It seems like
> these resistors would burn right up.  We are a little unsure of what is
> going on but I thought you all should know about this mystery too incase
> you try it.  If "you" figure it out, let "us" know :-))
>
> ---------------------
> Hmmmmm,
>
> If you but 4 ohms directly across the ac line, it will dissipate 3600
> watts...  The dimmer would limit that to maybe 1000 watts...  Something
> strange must be going on there.  However, if it works, it works.  But I
> think there is a good chance they are blown open which would probably have
> little effect.  I would leave it for now and maybe when you can play with
> you coil at length, check into it more.  Next time you see the coil, you
> may want to double check to see that they really are across the neutral and
> hot wires out of the dimmer and not in series.  Check the resistance if you
> can.  I bet it is higher than 4 ohms :-))
>
> Cheers,
>
>         Terry
>
> At 12:40 PM 10/17/2001 -0500, Ted Rosenberg wrote:
> >Hi Terry. Hey, if I can type at 6AM (I work from 7 to 4  :)....
> >No matter.
> >
> >The resistance was based on Marc's picking different low values on his first
> >iteration of connections...remember? The 10µF motor run cap and the 10 ohms
> >etc. It was about the same time you were using the 250W huge reistors? (I
> >have two...any ideas? They do not make good wind chimes!)
> >
> >Then Marc said that 4 ohms would be OK but he was not terribly clear as to
> >exactly where!!
> >Well, I didn't have 4 ohms. So two 8's in parallel gave me the 4 <at 40
> >watts>. Then I put them in series in the line and I almost burned up the
> >coil from the heat. That's when I got hold of you and you suggested across
> >the HEI. And that worked.
> >
> >Does that clarify? Or should I try and followup with Marc?
> >
> >-----Original Message-----
> >From: Terry Fritz [mailto:twftesla-at-qwest-dot-net]
> >Sent: Wednesday, October 17, 2001 12:33 PM
> >To: Ted Rosenberg; 'Scott.L.Hanson-at-seagate-dot-com'
> >Subject: RE: why 4 Ohms in PARALLEL with trigger coil primary?
> >
> >
> >Hi Ted and Scott,
> >
> >I forwarded this to the Tesla list by accident.  Sorry bout that...  You
> >may want to write me at:
> >
> >terrellf-at-qwest-dot-net
> >
> >So the sleepy Terry can't just forward all the morning mail on without
> >checking who it is addressed to...
> >
> >I did not understand why the resistors would be in parallel either :o)  I
> >thought they should be in series.  I figured, well, I guess it works for
> >Ted ok...  You may want to check them with an ohmmeter.  I wonder if they
> >blew open in the first second and they are just open now.  If they were
> >open, you may not notice (maybe they don't matter...).
> >
> >Cheers,
> >
> >       Terry
> >
> >At 07:02 AM 10/17/2001 -0500, Ted Rosenberg wrote:
> >>Hi Scott and thanks for the compliment.
> >>I have some answers for you but please understand, as I said in the paper,
> >I
> >>was the technician. Marc and Terry Fritz deserve the "why" rewards!
> >>
> >>I originally had the 4 ohms in-line. the resistors got SO hot that they
> >>would have burned the wood etc etc. I desparately e-mailed Terry as Marc
> >was
> >>unavailable. After some discussion, Terry suggested the new position
> >>and...it works. I really can't give you a better reason. Sorry. Perhaps you
> >>might ask Terry about that. Who knows, I might learn something  :))
> >>
> >>I do not own an oscope although I can borrow one.
> >>I had to get this coil into the Hangman's House of Horrors and I was
> >running
> >>out of time. So all seriosu tweaking, checking with scope, adding welders
> >>glass etc, will have to wait until the coil returns home after Oct 31.
> >>
> snip...

--
Barton B. Anderson
http://www.classictesla-dot-com