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RE: Jonathon's 6" Coil (fwd)
---------- Forwarded message ----------
Date: Wed, 27 Jun 2007 16:26:28 -0400
From: Scott Bogard <teslas-intern@xxxxxxxxxxx>
To: tesla@xxxxxxxxxx
Subject: RE: Jonathon's 6" Coil (fwd)
Jonathon,
I find it odd that you can get different results by adjusting the phase
of your spark gap. The reason I say this is because my SRSG will ONLY fire,
when it is perfectly in phase (I have about 2 degrees of play, between a
roaring gap (making a musical tone somewhere between B and B flat), and an
occasional random crackle, take it out another 2 degrees and I have
nothing). What is the approximate spacing of your gaps, mine are set kind
of wide, at about 1/8 in (which is not really ideal). Are you using 120 or
240 BPS, (or are you not from the states, and using 100 or 200 BPS). A tip
of advice, to phase my gap, I built a test rig out of a mason jar (beer
bottle) cap, and a copper coil primary, with a junk OBIT I had laying around
(that way if something got fried, it didn't matter a whole lot), just make
sure you put some form of primary (and ideally a secondary) in there so you
don't fry your junk transformer (don't use expensive capacitors, make one).
If phasing is still difficult to tell, widen your gaps until you set the
motor is in it's sweet spot (loudest, most steady noise), and then narrow
the gaps back down to decrease you gap losses. In my test rig I have no
safety gaps. What is your power level? 46 inches isn't too shabby! Good
luck.
Scott Bogard.
>From: "Tesla list" <tesla@xxxxxxxxxx>
>To: tesla@xxxxxxxxxx
>Subject: Jonathon's 6" Coil (fwd)
>Date: Tue, 26 Jun 2007 21:20:54 -0600 (MDT)
>
>
>---------- Forwarded message ----------
>Date: Tue, 26 Jun 2007 20:11:05 -0400
>From: Jonathon Reinhart <jonathon.reinhart@xxxxxxxxx>
>To: Tesla list <tesla@xxxxxxxxxx>
>Subject: Jonathon's 6" Coil
>
>Hello everyone. I read the post about people maybe not giving updates on
>their projects, etc. so I thought I'd give a little feedback.
>
>Some of you have heard about, and some of you helped (thanks!) get my coil
>started a few years back, and a little bit of help lately with my RSG.
>Almost a year ago, before I went to school I built with the help of my dad,
>a pretty decent SRSG. A week or two ago, I got it hooked up, after
>doubling my tank cap from 17nf to 34uf.
>
>At first, my results were quite disappointing. I was getting plenty of
>bright sparks at the SRSG, but absolutely no output from the coil, which I
>had tuned to its previous (Segmented SSG) sweet spot. I played and played
>with the rotation of the motor, but got nothing. I was starting to get
>worried, concerned that I had possibly blown one of my caps due to the SRSG
>being out-of-phase.
>
>Getting frustrated and ready to go inside for the night, I grabbed my
>primary tap and threw it on about 1/2 way in. Keep in mind this primary is
>only about 10-11 turns anyway. Turned off the lights, and threw the switch
>for my coil. Hey! About 4 inches of breakout. So I knew it was just a
>matter of fiddling with it. After playing and playing with the SRSG and
>the
>primary coil, I had set a new personal record for streamer length of 46" to
>a (poorly) grounded point. This only beat my previous record of 44 by two
>inches, but hey it's progress.
>
>Points for improvement have been noted, however. When adjusting the SRSG,
>I
>keep getting longer and longer streamers, but then the safety gaps start
>firing. I believe I have them set too conservatively far in. I think I
>will open them up some. Also, my topload is 4" aluminum dryer duct around
>standard-sized pie pans. I have some 6" aluminum flexible duct work (HVAC
>style) that is more ridgid, and longer, so I can stretch it out around a
>larger pizza-sized pie pan.
>
>Glad to be playing with ~0.75MV again :-)
>
>Jonathon
>
>
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