Re: CW coil top terminals?

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

Original poster: "Terry Fritz" <twftesla-at-uswest-dot-net>

Hi David,

Would a toroid on top help make longer arcs (in the staccato mode)?  I can
only tune down to 325kHz so I don't think I can add much top load right
now.  However, I will eventually wind another secondary probably with tap
points to adjust the frequency a little.  The RF generator is limited to
325 to 375 kHz so I have to stay in that band.  If a little toroid would
help I will account for that.  Having a tungsten point seems like a good
idea.  I think I can get a ceramic insulator so it can really cook :-))

Cheers,

	Terry


At 05:59 PM 1/28/2001 -0800, you wrote:
>Hi Terry, at least with Tube coils the "hot spot" is really only the 
>discharge spot. I use a sharpened Tungsten rod, so I would go with a small 
>Toroid (Mostly for looks, like one of John's little ones) with that 
>Tungsten needle point. Yes, one could weld with these CW coils ;-)
>
>Regards,
>
>David Trimmell
>www.ChaoticUniverse-dot-com
>
>At 02:14 PM 1/28/01, you wrote:
>>Original poster: "Terry Fritz" <twftesla-at-uswest-dot-net>
>>
>>Hi All,
>>
>>I am working on my CW coil and I was wondering what people are using for a
>>top terminal on CW coils?
>>
>>I guess it should be fairly small but I was wondering what would take heat
>>well.  It is a 900 watt (delivered to the arec) coil and I hope to get it
>>doing the staccato stuff soon.  Would like a small brass drawer pull be ok
>>or is the something better?  The coil will melt a pretty good diameter bare
>>wire.  I may need cooling fins under the terminal since the top of the coil
>>is PVC or I could add a ceramic standoff insulator if I can find one.  I
>>could also have a tungsten needle point if that would be best.
>>
>>Any thoughts are welcome here.  I hope to soon get this coil running from
>>an arbitrary waveform generator.  It is 350kHz but the generator can
>>control the power level and I can play with any power envelope I want then 
>>:-))
>>
>>Cheers,
>>
>>         Terry
>