Car ignition coil

Boom! The classic potato gun harnesses the combustion of flammable vapor.
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Schuyler
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I planned on using like 4 9v batteries...
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nibbler125
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i use a 9v battery pack with 1500mah and it works just fine
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TurboSuper
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You know, you can run it off a camera flash circuit and a 1.5V battery.
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mark.f
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TurboSuper has the idea.

You could also conceivably run it off a small gag lighter, which runs off a AAA battery, but don't take my word for it.
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