Re: [TCML] Frequencies

[Yurtle Turtle <yurtle_t@xxxxxxxxx>]

6,000 rpm times eight cylinders is more than 100 Hz.

--- On Sun, 10/11/09, Paul Brodie <pbbrodie@xxxxxxxxxxxxx> wrote:

> From: Paul Brodie <pbbrodie@xxxxxxxxxxxxx>
> Subject: Re: [TCML] Frequencies
> To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
> Date: Sunday, October 11, 2009, 3:02 PM
> A standard commercial automobile
> engine runs at 6,000 rpm tops. The ignition coils are
> deigned to be driven at this frequency. This works out to
> 100Hz or less, 6000 divided by 60 seconds. From much
> experimentation, I have found that the coils I have worked
> with, primarily the Accel Super Coil, will continue to
> produce higher voltage up to around 1kHz and then start to
> drop off. If you try to overdrive the ignirion coil, you
> will get less output, not more. Also, wouldn't it be better
> if you let everyone know what it is you are trying to
> accomplish with this? I believe you said you want to try to
> charge caps to first 25kV and then to 50kV in stages and use
> these to drive some sort of flash. Is this correct?
> Paul
> Think Positive
> ----- Original Message ----- From: Rhys Sage
> To: tesla@xxxxxxxxxx
> Sent: Sunday, October 11, 2009 03:23
> Subject: [TCML] Frequencies
> 
> 
> 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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