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Re: [TCML] Frequencies
A 555 timer works great for an ignition coil. I built mine with variable freq adjustment. As the freq increases the ignition coil output increases up to a certain freq then it levels off then it starts dropping. I don't have a freq counter so as long as I can still here it then the freq should be below 12K I can't hear much above that. I am guessing 5K is where it reaches max output. Down side to the ignition coil is, it makes a nice 1/2" spark all by its self running on 12 volts DC but the ignition coil is worthless for powering a TC.
>From: Rhys Sage <rhys_sage@xxxxxxxxx>
>Sent: Oct 11, 2009 2:23 AM
>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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