Looking for tungsten for rotary gap

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "The Krohns" <2halice@xxxxxxx>

Howdy folks,

I am looking for tungsten stock for a SRSG: Qty 8 - 3/8" stock, pre-cut to
length for a G-10 rotor and Qty 4 - 1/2" stock for the stationaries.  I hear
that Jim Mora might have some.  Jim, if you would, please contact me
off-list at 2halice@xxxxxxx .  If anyone else has a supplier, I would
greatly appreciate info.

Cordially, Hal in Tucson



----- Original Message -----
From: "Tesla list" <tesla@xxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Sunday, January 21, 2007 9:27 PM
Subject: Re: Garage door opener vs. Tesla coil


> Original poster: Frank <fxrays@xxxxxxxxxx>
>
> Modern electronics are not as robust as earlier ones. With the advent
> of the FET and CMOS, they are very easy to blow for any reason.
> Chances a TC arcing to the opener will blow the logic is very real,
> even with the power off, grounded, etc!
> I have had VTTC running and draw short arcs off near by lamps. The RF
> field can and will induce fairly high voltages in surrounding metals.
> The foils on PCB's in openers and other electronics can act as
> antennas and voltages can be induced into the IC"S causing damage.
> A friend of mine just blew up both his DVD players in 2 separate
> rooms running a small 10" coil.
>
> I have one antique medical Oudin that is quite spectacular with about
> a 2.5 KVA input (20 KV transformer, oil filled caps) where the
> secondary is only about 100 turns of #14 wire. It will throw a
> healthy 10" arc and wiped out a lap top 20 ft away as well as blanked
> out security on a campus!
>
> If you run it in the garage, the best suggestion is to remove the
> electronics from the opener or better yet, run it outside.
>
> Be very cautious too where your breaker panel is as you can get
> induced voltages back into your house wiring and possibly wipe out
> other electronics!
>
> Thanks, Frank
>
> At 05:34 PM 1/21/2007 -0700, you wrote:
> >Original poster: otmaskin5@xxxxxxx
> >Thanks everybody for the many suggestions on protecting garage door
> >openers and also for ideas on not getting the wife mad about coiling
> >mishaps (as a side note - surprisingly, she didn't get as upset this
> >time as she did the last time my TC destroyed something.  Maybe
> >she's getting used to it...at any rate, I don't want to push it).
> >
> >I will try a number of your suggestions.  I guess the salient point
> >is that coiling at increased power eventually gets to a point where
> >you just don't plug it in & go.  Set up & damage prevention measures
> >now seem to be taking more time than the time I spend actually
> >running the thing!  Dennis Hopkinton MA
> >
> >
> >
> >-----Original Message-----
> >From: tesla@xxxxxxxxxx
> >To: tesla@xxxxxxxxxx
> >Sent: Sun, 21 Jan 2007 12:53 AM
> >Subject: Re: Garage door opener vs. Tesla coil
> >
> >Original poster: "James Zimmerschied"
> ><<mailto:zimtesla%40msn.com>zimtesla@xxxxxxx>
> >
> >Dennis,
> >I had a similar experience with loss of a garage door opener circuit
> >card from my TC operations. The coil was far enough away that it did
> >not strike the opener but the receiver apparently did not like the
> >TC RF emissions. The replacement card was $90 and my wife was not
> >too keen on using the push button operator I rigged while waiting
> >for the new card.
> >
> >I now always unplug the door opener when I run small coils in the
> >garage. When I run my medium coil (which does strike the opener
> >rail), I unplug it and remove the PC card. - after dozens of runs at
> >different times there has been no further loss.
> >Jim Zimmerschied
> >----- Original Message -----
> >From: <<mailto:tesla%40pupman.com%3eTesla>mailto:tesla@xxxxxxxxxx>Tesla
list
> >To:
>
><<mailto:tesla%40pupman.com%3etesla%40pupman.com>mailto:tesla@xxxxxxxxxx>te
sla@xxxxxxxxxx
> >
> >Sent: Tuesday, January 16, 2007 6:13 PM
> >Subject: Garage door opener vs. Tesla coil
> >
> >Original poster:
>
><<mailto:otmaskin5%40aol.com%3eotmaskin5%40aol.com>mailto:otmaskin5@xxxxxxx
>otmaskin5@xxxxxxx
> >
> >
> >I looks like my coil murdered my garage door opener. While running
> >the coil in the garage, the garage door opened on it's own & then
> >died. I now have to open & close the door manually. I was careful to
> >position the coil far enough away so that no arcs could strike the
> >opener or anything connected to it, and it still seems to have
> >succumed to the coils effects somehow.
> >
> >My question is, other than unplugging the opener, are there any
> >preventative measures I can take to protect the garage door
> >motor/receiver? Or is there just no safe way to run the coil indoors?
> >I imagine the repairs won't be cheap so I'd like to avoid a
> >repeat. Thx for any advice. Dennis Hopkinton MA
> >
> >----------
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