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Ignition Diagram?

Post questions and info about hybrid (compressed gas with fuel) powered cannons here. This includes discussion about fuels, ratios, ignition systems, build types, safety, and anything else relevant.
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Unread postAuthor: Isomer » Thu Jan 10, 2008 11:51 pm

umm, this is actually for a handheld...dunno how that would work lol
And a thought...can i buy a commercial induction coil from an autozone or something similar?
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Unread postAuthor: paaiyan » Thu Jan 10, 2008 11:53 pm

You can probably buy the ignition coil from autozone, yes. You can just use a couple 9 volts also. Throw those and a switch into a project box and you're good to go.Just not that the coil will spark whenever the electricity flow changes. That means when you flip the switch on, and off, not just when you flip it on.

EDIT: Autozone's website tells me that I could get an ignition coil for a 2000 Silverado for 32 bucks. It made me pick a car, you can probably get a cheaper one.
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Unread postAuthor: Isomer » Thu Jan 10, 2008 11:55 pm

wait...so if im using a pushbutton switch.. it would fire on both the pull and release? lol that could be bad
way to combat this problem? use an actual transformer circuit i'd imagine
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Unread postAuthor: paaiyan » Thu Jan 10, 2008 11:57 pm

It wouldn't be bad. Just an extra spark.
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Unread postAuthor: Killjoy » Fri Jan 11, 2008 12:01 am

Drew up a quick circuit for you.

Image

And you won't be to use a transformer from a monitor since you have to have a seperate electrical driver to run it.

Edit: Crud, didn't see the other posts.
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Last edited by Killjoy on Fri Jan 11, 2008 12:04 am, edited 1 time in total.
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Unread postAuthor: Isomer » Fri Jan 11, 2008 12:02 am

whats the box in the bottom right? a project box?
And the black+yellow thing is?
lol been so long since i've read a circuit diagram...i might have to break out the manuals
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Unread postAuthor: Killjoy » Fri Jan 11, 2008 12:11 am

No not a project box, it was just to seperate the simple spark pulg I drew form the rest of the diagram.

And the black thing is wires going from the igniton coil, and the yellow thing is a spark.
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Unread postAuthor: paaiyan » Fri Jan 11, 2008 12:13 am

He said bottom right, not left. That is a project box. You can put the switch, capacitor, flash tube, and batteries in there. Though I must confess, I don't know what the flash tube is for.
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Unread postAuthor: Isomer » Fri Jan 11, 2008 12:14 am

box on the bottom right that contains nothing but just connects the trigger, flash tube, and capacitator-thats the one i mean
does it just signify that they are all connected?
Could you explain what a flash tube is?
Are we talking about a camera flash circuit?
And the spark plug is connected to the - side of the spark gap in that diagram correct? the other one is connected to the conductive chamber right?
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Unread postAuthor: paaiyan » Fri Jan 11, 2008 12:16 am

I haven't got a clue what the flash tube is. For a while I wanted to build my own induction coil, and there was no flash tube in the diagrams. Just the power source and capacitor. And a switch.
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Unread postAuthor: Killjoy » Fri Jan 11, 2008 12:41 am

Aw sorry Thats supposed to be the circuit bored for the camera flash.

The flash tube is like the switch between the capacitor and the coil, but unlike the switch, it won't weld together after a few uses. So instead of wasting switches, you can use the flash tube as a switch by triggering it to flash like you normally would.

And your right isomer, the one wire of the spark gap is connected to the chamber (which is connected to the middle connector on the ignition coil) and the other is connected to the ignition coil - screw.
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Unread postAuthor: Isomer » Fri Jan 11, 2008 12:44 am

mk cool thx-message too short lol
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Unread postAuthor: jimmy101 » Fri Jan 11, 2008 4:05 pm

Isomer wrote:i believe in quality>quantity. Example: I buy a bbq lighter and have to replace
it in anywhere from 1 minute to 3 years. I buy parts, a bit more $, for a quality spark
plug ignition and alll i have to change is the batteries.

Chances are you'll have to replace parts in any home made ignition system. Piezo BBQ lighters last about as long, on average, as any other setup.

Isomer wrote:im too lazy to read all that lol

:(
Fortunately for you, several contributors to this forum are not too lazy to try to answer your questions.

Isomer wrote:been so long since i've read a circuit diagram


Given the above posts you shouldn't even be considering an automotive coil, or flash circuit or anything else that requires more than three parts. Either get a piezo or battery operated BBQ ignitor, or better still, a stun gun. If stun guns are illegal where you live than get one that has been converted into a "high voltage power source" from BCARMS.

Isomer wrote:wait...so if im using a pushbutton switch.. it would fire on both the pull and release? lol that could be bad way to combat this problem? use an actual transformer circuit i'd imagine

Why would that be bad? The gun'll fire on the first spark, the second would be irrelevant. Besides, automotive coils generally spark when the current flow is stopped, not when it starts.
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Unread postAuthor: psycix » Sun Jan 13, 2008 5:42 pm

About your tree-hugging girlfriend: whats her problem with your guns? They use biological ammo made from vegatables!
No pollution - no animals hurt.
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Unread postAuthor: Isomer » Mon Jan 14, 2008 12:51 am

Jimmy, I don't like your pessimism. If everyone thought like you, we'd still be in the dark ages.
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