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A place to ask general spud cannon related questions.
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Unread postAuthor: mobile chernobyl » Wed Jan 04, 2012 2:16 am

Well I sort of kind of discovered a fix for the tippmann's ignition. Sadly it was by accident when I was deep into working on a custom circuit using a PIC12F675 as a driver chip...

In short, I "shorted" out two wires through a blown mosfet circuit which was supposed to drive the coil directly from a PIC output pin... For the life of me couldn't figure out why the gun was all of a sudden sparking non stop.

What I discovered is that the entire second control board of the tippmann marker is not needed, it's simply a 555 circuit in monostable form putting out a pulse for the length of the normal ignition period (around .6-.75 seconds). Without this control board, it will now simply go into "taser" mode as I like to call it, for as long as you hold the trigger - eliminating any kind of BPS cap it had before.

This solution was so simple it's actually kind of frustrating, because I'm really trying to learn how to apply my damn Electrical Engineering course work to real world projects lol...

Anyways, here is the original circuit just about (courtesy of Dewey-1's collaboration work)...
Image

And here is the "ghetto rigged" circuit which will pretty much allow this gun to fire as fast as you can pump it! Note - the reed switch is not needed, and I've actually tried "autotriggering" it with the switch constantly held down (and in taser mode lol) and it will fire normally probably 90% of the time if you pump fast enough, if not you get a "misfire").
Image

So as you can see, the little FLC10-200 chip is really doing a lot of the hard work. That's suiting because it's designed specifically for CDI ignition systems - to discharge the capacitor at a predetermined frequency if it is fully charged. This is good for stuff like oil burners or CNG powered water heaters. It does exactly what a hall sensor or "points" would do in a engine powered ignition system - tells the capacitor when to discharge into the coil and create a spark.

So sadly folks, no magic here. If you want to have an "uncapped" tippmann C3, simply desolder the control bored and solder the existing trigger wires into pins 2 and 3 of the ignition board - they are long enough to reach.

As frustrating as it is, it's always cool discovering a free mod to achiever higher BPS's. Sorta like the old switch mod to get "turbo mode" (aka a shot on the pull and release of the trigger) on the shoebox shockers, or any other gun that uses a 3 prong, SPDT microswitch!
:)
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Unread postAuthor: mobile chernobyl » Fri Jan 13, 2012 10:09 pm

Well sort of an update -

I made this little conversion tank for it a week ago:
Image

Basically I took a 12g CO2 cylinder, and cut it and welded it to a 1/2 of a 1/4"NPT union piece - this was to imitate having a 12g on the gun.

Filling is accomplished with this set of filling adapters:
Image
Image

- Basically that is a 20lb propane tank to disposable tank adapter (for filling the 1lb disposable camping stove tanks) and then a disposable tank male to 1/4"NPT male adapter - with the schrader check valve in place!

So I screw it all together, flip the 20lb propane tank and fill the 12g cylinder lol... Here's an example of the 12g on the 20lb'er and the 12g on the gun...
Image
Image

Initial tests under non ideal filling conditions (the 12g should really be frozen to low temperatures so there's no expansion motivated by the warm walls) I'm getting great results!

a normal 12g filled with CO2 will yeild about 40 shots from the most efficient pump guns. this "12g" cylinder filled with only about 1.5g of propane yields on average.... 130 shots per fill!

perdy kewl! :D
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Last edited by mobile chernobyl on Sat Jan 14, 2012 5:26 am, edited 1 time in total.
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Unread postAuthor: Gun Freak » Fri Jan 13, 2012 11:06 pm

Epic win if you ask me! :D
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Unread postAuthor: jackssmirkingrevenge » Sat Jan 14, 2012 8:01 am

Quite remarkable for such a small tank, good job!
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Unread postAuthor: Truck » Sat Jan 14, 2012 9:11 am

That really is fascinating! Great work !!
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