Re: Ignition Coils (fwd)

["Tesla list" <tesla@xxxxxxxxxx>]

---------- Forwarded message ----------
Date: Wed, 11 Jul 2007 21:48:51 -0400
From: Scott Bogard <teslas-intern@xxxxxxxxxxx>
To: tesla@xxxxxxxxxx
Subject: Re: Ignition Coils (fwd)

Wow, that is really neat (and confusing)!  As much as I hate to admit when 
I'm wrong (not really!), this presents some real opportunities.  I think Dr. 
R is right (referencing the next post, which I have already read), a solid 
state setup would be the way to go with this particular arrangement.  So, 
Back to Daniels original question, If you wanted to use one of these mains 
voltage AIC transformers to drive a TC, you would want to rectify the 
outputs and make a DC coil right?  Or is their resonant frequency low enough 
to use as AC coil power supplies.  Considering they only draw 1 amp, I'd 
imagine you could parallel a dozen or so identical units to make a pretty 
monster power supply.  I have also been investigating a similar method for 
use with flyback transformers (to make simpler plasma globe drivers, with 
like three parts) Do you think this would work (assuming you wound a very 
high number of turns primary, to keep the turns ratio down in a reasonable 
level, and had your solid state gap set to the right number of "breaks per 
second").  Just musing.
Scott Bogard.


>From: "Tesla list" <tesla@xxxxxxxxxx>
>To: tesla@xxxxxxxxxx
>Subject: Re: Ignition Coils (fwd)
>Date: Wed, 11 Jul 2007 15:28:06 -0600 (MDT)
>
>
>---------- Forwarded message ----------
>Date: Wed, 11 Jul 2007 20:48:09 +0000
>From: Jeff Behary <jeff_behary@xxxxxxxxxxx>
>To: tesla@xxxxxxxxxx
>Subject: Re: Ignition Coils (fwd)
>
>Hello Scott, Daniel,
>
>Running an ignition coil from 110V does seem crazy, but I managed to run 
>one
>from 220V, which seems even more crazy:
>http://www.electrotherapymuseum.com/2007/250WT/index.htm
>
>This ignition coil in the photo is from a Model T.  I'm sure a modern one
>would work even better...maybe someone will try.
>
>In the old days of points/condensers the voltage on the cap could reach a
>few hundred volts when the circuit was broken.  I just used this concept
>with a spark gap to do in the interrupting instead of the points or
>electronics..and switched the wiring to a normal TC circuit.  The discharge
>is pretty mean, low frequency, not one you would want to come into contact
>with by any means!   I was consuming a little over an amp or from a 220V
>line (actual measured voltage was 241V).  The only tricky bit is the
>tungsten spark gap, which should be near to .001" or around the thickness 
>of
>a piece of paper.  The cap was 1/2 mfd.  I also tried it with a microwave
>oven cap, around 1 mfd.
>
>I'm curious to test this one day to see how it will power a normal TC
>instead of a transformer.
>
>Jeff Behary, c/o
>The Turn Of The Century Electrotherapy Museum
>http://www.electrotherapymuseum.com
>
>
>
> >From: Scott Bogard <teslas-intern@xxxxxxxxxxx>
> >To: tesla@xxxxxxxxxx
> >Subject: Re: Ignition Coils (fwd)
> >
> >Daniel,
> >      I think putting an ignition coil across 120 V AC is asking for a 
>pile
> >of molten copper (correct me if I'm wrong guys).  They are meant for 12 V
> >or
> >so DC input (off a condenser, triggered by the distributer), and get HV
> >out,
> >by operating at resonance (like a TC, using one off of turns ratio alone
> >doesn't amount to much).  You have to drive the coils with a small solid
> >state circuit (either a 555 timer based circuit, or you can be tricky, 
>and
> >use a circuit like this
> >http://www.personal.psu.edu/sdb229/plasma%20ball%20power%20supply.html
> >just wind three windings on a small toroid core transformer (pirated out 
>of
> >something) and they will be your primary, and feedback windings, as well 
>as
> >a winding to put voltage into you ignition coil.  I have never actually
> >tried this, but it does work with flybacks, so it should work with an
> >ignition coil as well.)  After you have your ignition coils resonating at
> >whatever frequency they work best at (my circuit may not perfectly match
> >their frequency, therefore may not be the most efficient, but it is real
> >easy), you rectify their outputs (parallel as many as you want for 
>maximum
> >power, give each coil its own driver though), and make yourself a tiny DC
> >coil.  I wouldn't rule out subbing in flybacks instead of Ignition coils,
> >but you might have to use the old AC type, and rectify them, as I think 
>the
> >polarity of modern rectified flybacks is wrong for your application 
>(maybe
> >it doesn't make a difference!  I don't know).  Good luck.
> >Scott Bogard.
> >
> >
> > >From: "Tesla list" <tesla@xxxxxxxxxx>
> > >To: tesla@xxxxxxxxxx
> > >Subject: Re: Ignition Coils (fwd)
> > >Date: Tue, 10 Jul 2007 20:50:52 -0600 (MDT)
> > >
> > >
> > >---------- Forwarded message ----------
> > >Date: Wed, 11 Jul 2007 02:31:53 +0000
> > >From: Langer Giv'r <transworldsnowboarding19@xxxxxxxxxxx>
> > >To: tesla@xxxxxxxxxx
> > >Subject: Re: Ignition Coils (fwd)
> > >
> > >hey that looks like a pretty good schematic.  Thanks.  Just a quick
> > >question
> > >on it:  The signal generator being the 555 does not show which prongs 
>to
> > >use.  The 2N3055 transistors are pretty staight forward, but I can't
> >figure
> > >out which of the 8 prongs to use on the 555.
> > >
> > >this is the page that shows the schematic i'm looking at:
> > 
> >http://www.rmcybernetics.com/projects/DIY_Devices/homemade_tesla_coil.htm
> > >
> > >Also, if I wanted to use more power, would I be able to use 120V AC to
> > >power
> > >the coils? (kinda like a small version of a NST)  Would i need heavy
> > >resisting or ballasting?  Could i just use like three in parallel to
> > >increase the voltage I can put accross them?
> > >
> > >
> > >Daniel
>
>
>
>

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