RE: [TCML] 5" Sparks - Approx 35 watts input power: Tesla was correct!

[Jeff Behary <electrotherapy@xxxxxxxxxxx>]

Derek,
 
Well done, that's exactly what I was looking for.  Your pulse controller sounds interesting - one of the difficult parts in the old
technology is to time the period of the "makes" and "breaks" properly.  It takes some intricate machining, and many patents were
filed using novel ways of accomplishing this.  Do you have any videos of this coil in operation?
Your pictures turned out great!  
  
Also, I really enjoyed seeing the neon beer mug at gaussfest.  
Jeff Behary> From: tesla@xxxxxxxxxxxxxxxxxxxxxxxx> To: tesla@xxxxxxxxxx> Subject: RE: [TCML] 5" Sparks - Approx 35 watts input power: Tesla was correct!> Date: Thu, 13 Mar 2008 09:35:59 +0000> CC: > > Jeff,> Take a look at http://www.extremeelectronics.co.uk/coils/sprite/> This is a small DRSSTC that I believe is fairly efficient.> > Although not documented on the site I run this coil from a 12v 100W> inverter (12v - 400Vdc Pk directly into the bridge Picture at> http://www.extremeelectronics.co.uk/gaussfest2008 ). I have built a pulse> controller that will allow bursts of 400hz BPS at a variable mark space.> This allows the storage capacitors to charge to full voltage in between> bursts. > > Running this coil with a 50:50 mark space (250ms long bursts of 400hz) the> coil draws around 4A at 12V and gives 10-11" arcs. (Roughly double the> secondary height).> > Does this count in your search for small efficient coils?> > Cheers> Derek> > -----Original Message-----> From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On Behalf> Of Jeff Behary> Sent: 12 March 2008 21:37> To: Tesla Coil Mailing List> Subject: RE: [TCML] 5" Sparks - Approx 35 watts input power: Tesla was> correct!> > > John,> My point of this was a while back when everyone was getting fed up with the> "wireless transmission" posts.My argument was in general to try and recreate> some of Tesla's work that is achievable - like anefficient table top coil as> those Tesla made in the 1890s. There was a lot of neat patents and> conceptsthat came from that period, and all of them are "on topic" and> relating to "Tesla Coil" construction.> > The result was more or less a bombarding of posts regarding how authentic> Tesla's statements were,suggesting the claims were exaggerated/etc.> Several people mentioned ignition or induction coils withthose efficiencies,> which I agree are completely possible, but I am interested in Tesla> Coils,resonant circuits with high efficiencies. Something like we normally> build, but low power.I know with your brilliant work in modern Tesla Coil> circuitry that for sure these claims are easilyobtained if Tesla could do it> with archaic technology. I would love to see it though from someone,because> I think it may offer some interesting designs and creativity.> Its an unusual request to group of people normally making huge sparks. The> 35 watts is irrelevant to me, I was hoping just to see some responses of low> power (less than 75 watts) and efficient Tesla Coils (4 - 6" sparks?) made> by people on the list. As much as there is a fine art in making huge> sparks, I think thereis an equal opportunity of creativity in making> smaller, more efficient machines too. Surely something can belearned from> it...?> > Jeff Behary> > Peter, Jeff,> > I agree with what Peter says below. Also I> don't understand why anyone> would consider it difficult to produce a 6"> spark using 35 watts even for a > normal> type of tesla coil (non-kicker> type). Using my formula:> > spark length inches = 1.7* sqrt input watts> (wallplug)> > gives a result of 10" for 35 watts. However small coils seem> to give shorter> sparks than the formula suggests, so perhaps the spark> would be about > 6" or 7" long.> > Cheers,> John>> _________________________________________________________________> Shed those extra pounds with MSN and The Biggest Loser!> http://biggestloser.msn.com/_______________________________________________> 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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