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Spark generators

Post questions and info about combustion (flammable vapor) powered cannons here. This includes discussion about fuels, ratios, ignition systems, safety, and anything else relevant.
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Unread postAuthor: rcman50166 » Thu Jan 14, 2010 2:04 am

Have you ever seen an ignition coil firing from a wall outlet. 120Hz cycle rate. I think it's more than sufficient. However it is obviously not very mobile. I can reccomend a battery fit solution, but it costs $400+ :oops:

Another solution is a battery inverter with an AC ignition coil circuit. All together its around $200+. That's better :?:
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Unread postAuthor: Zeus » Fri Jan 15, 2010 12:12 am

Do you mean the triac phase shift circuit (light dimmer). I had one going
45uF cap, 4 inch sparks and it burnt plastic like a blowtorch.
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Unread postAuthor: ramses » Fri Jan 15, 2010 7:39 am

so you can spend $200 on a car battery, inverter, etc., or you could buy an electronic bbq ignition for ~$30 max. You choose.
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Unread postAuthor: ahabich » Fri Jan 15, 2010 9:02 am

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Unread postAuthor: rcman50166 » Fri Jan 15, 2010 1:49 pm

Zeus wrote:Do you mean the triac phase shift circuit (light dimmer). I had one going
45uF cap, 4 inch sparks and it burnt plastic like a blowtorch.


Yes that is what I meant. I use a microwave oven 1000uF cap.
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Unread postAuthor: Zeus » Mon Jan 18, 2010 9:28 pm

I hope you mean 1000nF otherwise I'd like to know what MO that came from.
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Unread postAuthor: nibbler125 » Tue Jan 19, 2010 12:16 am

i have used a 9000 volt neon sign trantsformer before and it works great. but you need a spot to plug it in and it is very dangerous if it gets you
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Unread postAuthor: Spudnyk » Wed Jan 27, 2010 3:52 pm

Electric BBQ lighters works great, very consistent good spark gap
runs off a AA battery you can buy them at Home Depot or Lowes 20.00 bucks. :sign4:
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Unread postAuthor: McCoytheLesser » Wed Jan 27, 2010 4:47 pm

If you have some RC batteries you might be able to try to make a 555 ignition circuit. I've built this exact circuit with great results and all the components are available at Radioshack, BUT it will drain small current sources in a heartbeat. Personally, for a spud gun, I'd just stick to the electric BBQ lighter or a stungun.
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