Re: [TCML] Frequencies

[DC Cox <resonance@xxxxxxxxxxxx>]

high rpm engines (above 5000 rpm) usually employ a specialty type coil such
as the Mallory, or my favorite, the Accel Supercoil (about $45 at
JEGS.com).  These are oil filled and designed to handle the higher stresses
of high rep rates ---- like running in the 5,000 to 7,500 rpm range for 500
mile race on a stock car track.  In addition to being oil filled these coils
have lots of extra HV insulation around the HV output towers.

cardboard is NOT a good choice for HV insulation.

also, car ignition coils only put out a few mA so this coil will not provide
very big sparks.

if you resonant the HV output with a cap or tank circuit (LC circuit) the
coil will die in short order.

It's not clear what your application is.  if you're trying to do Kirlian
photography or other similar effects, I have a much better driver than runs
direct off a 120 vac outlet.  You can contact me off-list for this if you
need it.

Dr. Resonance





On Sun, Oct 11, 2009 at 12:23 AM, Rhys Sage <rhys_sage@xxxxxxxxx> wrote:

> I've considered a whole load of alternatives for driving the ignition coil.
> I decided in the end to play safe and optically isolate the coil from the
> 555 pulse generator. To that end I'll employ an IR emitter-detector pair.
>
> I discovered a capacitor plus a resistor across the coil should, according
> to one website, foil any surges from the coil while a diode in series should
> foil any kickback.
>
> I have a pretty mundane coil at the moment. It's a cheapie coil that I
> bought just to try things with. I expect it won't be powerful enough to use
> for anything other than experimentation - which is fine right now.
>
> 400 hertz is quite slow. Using a simple electric motor running at 6000 rpm
> and a spinning disk with 4 segments of alternate block and clear combined
> with an interrupter would give me about 200 pulses a second. Doubling the
> segments to 8 would give 400 hertz. That's achievable with a simple piece of
> cardboard!
>
>
>
>
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