Re: [TCML] Frequencies

["Paul Brodie" <pbbrodie@xxxxxxxxxxxxx>]

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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