RE: [TCML] Coil pics & many thanks

[Andrew Nettles <anettles@xxxxxxxxxxx>]

Herr Zapp,
 
Thanks!
 
My primary is maxed out on turn 15 I think.  I have another toroid that I can stack on top but I haven't done the pie-plate/aluminum tape thing to it yet.  I only ran it outdoors once but had problems with racing arcs using either toroid and I couldn't seem to get the performance out of it that I could running it in the garage with all that stuff around it.
About the MMC, I realized it was underrated as Terry mentions it on his site.  I just went to go look it up but his site appears to be down at the moment.  Anyway, he said something to the effect of you're not going to get the whole bang if your rotary is set right but the main thing is that he tested those caps and they can take quite a bit more than their rating.  That, and they're self-healing.  I figured it was a fairly safe bet.  So far, so good but Digikey has stopped stocking those caps.
 
I ran it again the other night and was planning on setting the safety gap properly again, but it was late & I didn't want my spectator to have to wait.  When I started cranking it up I was getting lots of pops on the safety so I shut it down and backed both screws out a half a turn.  Then it ran great and the safety gap was completely silent.  Next time I'll set it the right way.
 
Thanks for noticing my typos - they're fixed now :) 
 
- Andrew



> Date: Sat, 11 Oct 2008 22:57:47 -0700> From: quarkster@xxxxxxx> Subject: Re: [TCML] Coil pics & many thanks> To: tesla@xxxxxxxxxx> CC: > > Andrew ->  > Very nice workmanship!>  > I don't know where you currently have your primary tapped, but if you have a few turns still available you might consider going to a larger toroid. Your current toroid may be a little small, and you should be able to squeeze a little more arc length out of the coil with a larger toroid.>  > If your MMC consists of (10) 1600V capacitors per string, the "nominal" voltage rating is only 16,000V. The peak voltage delivered by your 15KV NST is actually over 21KV (assuming no higher than 115 VAC input), so your MMC theoretically has a negative safery margin for voltage. Even if you see lots of "action" at your safety gaps, be very careful about opening them up beyond the point where they breakdown with only the NST connected. Additional tuning adjustments may help reduce arcing at the safety gap.>  > Your photos clearly show the construction details, but there may be a typo or two in the MMC section. It looks like your MMC utilizes 50 caps, not 60, and I'm sure that the value of the individual caps is not 28uF. If you duplicated Terry Fritz' early MMC design with Panasonic ECW-H16563JV capacitors, each cap is rated at .056uF, and your (5) strings of (10) capacitors each yields a total MMC value of .028uF.>  > Regards,> Herr Zapp> > --- On Thu, 10/9/08, Andrew Nettles <anettles@xxxxxxxxxxx> wrote:> > From: Andrew Nettles <anettles@xxxxxxxxxxx>> Subject: [TCML] Coil pics & many thanks> To: tesla@xxxxxxxxxx> Date: Thursday, October 9, 2008, 9:05 PM> > I finally got an album together of my first 6" coil if anyone's> interested. It's a lot of construction pics (including variac brush repair)> & a couple of videos of the finished coil. I put the album together mostly> for people who don't know a thing about coils so some of the captions> probably explain a lot of stuff you already know. I tried to document all the> construction steps but I can't seem to hang on to my camera :(> > http://picasaweb.google.com/andrew.nettles/My6InchTeslaCoil?authkey=q3ac0VTAgSY> > Thanks to many people who gave me advice through the list, have excellent> websites, & answer emails. I don't want to neglect to mention anyone> but especially Gary Lau, Ritchie Burnett, Terry Fritz (among many things I> blatantly ripped off his cap design), John Freau, Bart (JavaTC Rulez), Alan> Majernick for the Oriental reaction motor & super cool rotor, and Bill Noble> for helping out with the variac.> > Feedback of any kind would be great.> > Hopefully I will be able to permanently set it up somewhere soon - right now> it's in someone else's shop & it's kinda hard for me to get time> to play with it. Sure is fun though.> > - Andrew_______________________________________________> Tesla mailing list> Tesla@xxxxxxxxxxxxxx> http://www.pupman.com/mailman/listinfo/tesla> _______________________________________________> Tesla mailing list> Tesla@xxxxxxxxxxxxxx> http://www.pupman.com/mailman/listinfo/tesla_______________________________________________
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