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Help on camera ignition!

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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Help on camera ignition!

Unread postAuthor: pimp » Wed May 30, 2007 3:28 pm

I am planning to build a camera ignition for my spud gun. While i was looking at the diagram i saw a little gap and it said 12v dc. I am asking what is it?Also i am looking for a ignition coil and i don't no where i could get one and how much for one? Thank you in advance for you help.

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Unread postAuthor: Velocity » Wed May 30, 2007 3:50 pm

12V DC indicates that you need to put a battery or other power source there that produces 12V DC. Eight AA batteries could work

EDIT: I made this a while ago... its a full diagram... might help a little bit.

<img src="http://i94.photobucket.com/albums/l112/rmich732/CameraFlashIgnition.jpg">

It is just a combination of all of the wiki article pictures.
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Unread postAuthor: Killjoy » Wed May 30, 2007 5:34 pm

You can get the igniton coil at a junk/salvage yard or an auto parts store, or out of someones car. New the coils can be between 25 and 50 bucks, used or purchased from a salvage yard or something they can be extremely cheap. the ones i use for my hybrid cost 5 bucks each from a salvage yard.
And iv'e always been disapointed with using 12 volts with an igniton coil, just didn't seem to have a large enough spark, try discharging a capacitor from a camera flash circuit into the igniton coil, and use the flash as the trigger, the wiki talks about it.
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Unread postAuthor: jon_89 » Wed May 30, 2007 7:24 pm

i thought the 12v was to power the relay
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Unread postAuthor: jimmy101 » Thu May 31, 2007 12:25 pm

Different folks' posts are using the 12V for different reasons. Rmish is using it to just power the automotive relay. The actual current for the coil is the ~300V from the photo cap on the flash board.

The diagram Pimp posted is incomplete, not enough info there to actually contruct an ignition system.

To use 12V with an auto coil you need a serious 12V battery supply to get a strong and consitent spark. Eight 1.5V batteries in series, or even a 12V "wall wart", really can't supply enough current. An automotive battery (or a smaller jumper battery or motorcycle battery) is best. Another possibility is an automotive battery charger.

Rmich's circuit is a good one. To save some bucks, and eliminate several parts, the relay+push button+12V battery can be repalced by a standard 120V wall switch. The switch will probably get fried eventually, and isn't real elegant, but it will work.
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