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Stungun on 18v?

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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Stungun on 18v?

Unread postAuthor: biggsauce » Sun Apr 27, 2008 1:55 pm

I'm running my chamber fan on 18v (2 9v in series) and I would like to someday add a stungun to my cannon. I also want to try to run both the fan and stungun off just the two batteries. But 18v will damage the stungun right?
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Unread postAuthor: hi » Sun Apr 27, 2008 3:06 pm

i have a stungun that works off of 2 9 volt batteries. i think its easier and safer to have them have their own power source.
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Unread postAuthor: jimmy101 » Sun Apr 27, 2008 3:25 pm

A 9V stungun will probably fry itself at 18V

Simple solution, take a voltage tap between the two 9V batteries. Use the 9V for the stungun and the 18V for the fan.
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Two 9V batteries to power a fan at 18V and a stungun at 9V.
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Unread postAuthor: biggsauce » Sun Apr 27, 2008 3:30 pm

jimmy... thanks. I didn't even think of that. :oops:
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Unread postAuthor: Spudgun on Crack » Sun Apr 27, 2008 3:45 pm

No, don't try to run it at 18v.

Take a camera circuit for example if you go over 3-3.5v the transistor frys, thats what will happen with the stun gun.

You could replace the transistor inside with something that could take more but there is a limit. Eventually the insulation on the transformer inside won't be enough and you will have internal arcing.

I suggest that you just stick with the stun gun at the voltage that it was made for instead of risking its destruction.

You could also rebuild it using the original transformer, using a 555 timer and a large transistor, you could run it at a high voltage but once again it will eventually cause internal arcing.
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Unread postAuthor: biggsauce » Sun Apr 27, 2008 3:59 pm

Spudgun on Crack wrote:No, don't try to run it at 18v.

Take a camera circuit for example if you go over 3-3.5v the transistor frys, thats what will happen with the stun gun.

You could replace the transistor inside with something that could take more but there is a limit. Eventually the insulation on the transformer inside won't be enough and you will have internal arcing.

I suggest that you just stick with the stun gun at the voltage that it was made for instead of risking its destruction.

You could also rebuild it using the original transformer, using a 555 timer and a large transistor, you could run it at a high voltage but once again it will eventually cause internal arcing.


I appreciate the advice, but jimmy's idea is simplae, and I love simple.
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Unread postAuthor: BigGrib » Sun Apr 27, 2008 4:12 pm

for optimum battery life i would run the stun gun off of it's own battery, and for the fact that if you are like me you run your fan during ignition, you are going to draw power away from both the stun gun and the fan during ignition and you wont get near as hot of a spark.
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Unread postAuthor: biggsauce » Sun Apr 27, 2008 4:21 pm

I don't plan to run the fan during ignition, so no problem there. I just want to stick with two 9v to keep cost down. I just wish I could find my second battery pack so I can recharge instead of buying tose damn things...
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Unread postAuthor: mark.f » Sun Apr 27, 2008 10:03 pm

BigGrib, I doubt the chamber fan and the stungun combined will draw enough current at 9 and 18 v respectively to alter the output of the stungun. If the batteries can't provide enough current, he can wire some more in parallel to counter this as well.

I say you just keep it simple and run the stungun off it's own battery, or use jimmy's idea.
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Unread postAuthor: biggsauce » Sun Apr 27, 2008 11:50 pm

Yeah I'll be going with jimmy's idea, its better for my application anyway
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Unread postAuthor: starman » Sun Apr 27, 2008 11:57 pm

biggsauce wrote:I don't plan to run the fan during ignition, so no problem there. I just want to stick with two 9v to keep cost down. I just wish I could find my second battery pack so I can recharge instead of buying tose damn things...


You should consider letting the fan run during ignition. Makes a noticable performance difference!!
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Unread postAuthor: biggsauce » Mon Apr 28, 2008 12:26 am

starman wrote:
biggsauce wrote:I don't plan to run the fan during ignition, so no problem there. I just want to stick with two 9v to keep cost down. I just wish I could find my second battery pack so I can recharge instead of buying tose damn things...


You should consider letting the fan run during ignition. Makes a noticable performance difference!!


Does the performance increase have to do with the turbulence presented by the fan? Or am I off on this?

(I've been reading some articles about DDT and I'm looking for more information, so if anyone has any links they found helpful, feel free to shoot em my way..)
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Unread postAuthor: starman » Mon Apr 28, 2008 12:47 am

biggsauce wrote:
starman wrote:
biggsauce wrote:I don't plan to run the fan during ignition, so no problem there. I just want to stick with two 9v to keep cost down. I just wish I could find my second battery pack so I can recharge instead of buying tose damn things...


You should consider letting the fan run during ignition. Makes a noticable performance difference!!


Does the performance increase have to do with the turbulence presented by the fan? Or am I off on this?


Yep, the fan represents your turbulence induction. The same fan is then used to intake fresh air into the chamber. It's not unusual that I just leave the fan running during an extended shooting session. One reason I'm moving to RC rechargable batteries on my next guns...9v batts good for onesie and twosie shooting.
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Unread postAuthor: biggsauce » Mon Apr 28, 2008 10:18 am

9v batts good for onesie and twosie shooting.


You mean you're getting one or two shots off the batteries?
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Unread postAuthor: mark.f » Tue Apr 29, 2008 6:21 am

I use to run my combustion fans on the PPC 600 and 1000 (way back a long time ago, never posted them on Spudfiles) off a single 9v battery, and I hardly ever had to change the battery.
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