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Remote Battery

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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Remote Battery

Unread postAuthor: rebalgray » Sat May 12, 2007 8:59 am

I was thinking on putting AA batteries in my 3\4" handle to run a fan. The problem was getting all of them in there. Flone and I were talking about this. He mentioned having a 12 volt battery in his garage door remote. I have one of these batteries. It's a 23A 12 volt. It's shorter than a AA battery. I was wondering if any one has tried one to run there fan and how long they would last. I hooked one to a fan and it ran it at a good clip. I wouldn't be using it to power my igniter. Just the fan.

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Unread postAuthor: TwitchTheAussie » Sat May 12, 2007 9:04 am

They do work but I wouldnt know how long for. Sorry :oops:
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Unread postAuthor: Fnord » Sat May 12, 2007 9:08 am

wait.. you have a have a 12v thats shorter than an AA and can supply 23 AMPS? I think you read it wrong.

You can use a 9-volt to run most fans.
I have a 60mm that has run for about 30mins from a 9-volt.
you could also use AAA batteries, they're smaller and will fit better.
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Unread postAuthor: rebalgray » Sat May 12, 2007 9:16 am

I didn't read it wrong. I have the package it came in right in front of me. It says right on it "Type-23A 12V"

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Unread postAuthor: sandman » Sat May 12, 2007 10:33 am

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Unread postAuthor: ammosmoke » Sat May 12, 2007 10:50 am

Dang......... Thats one good way to fry somebody's electronics. Would make for a good prank!! :twisted:
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Unread postAuthor: sandman » Sat May 12, 2007 10:58 am

they are cheap too, lol :idea:
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Unread postAuthor: sjog » Mon May 14, 2007 9:23 pm

Batterys for the fan are easy , lots of options.
I've had trouble powering the stun circuit.
Two have burned out on me. By trying to give the fan 12v I burn out stunner.
Next time I'm going to have two batterys , 9v for spark and 12v for fan.
There must be a way to reduce the voltage from 12v to9v so I can one battery pack to power both.
What would that be? A resister ? Some thing simple to put in line before stun circuit. Any input would help, Keep it simple.
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Unread postAuthor: Hotwired » Tue May 15, 2007 4:20 am

Shove a resistor in one of the connections to the stun gun circuit.

How convenient: http://www.cpemma.co.uk/diodes.html

So get a 24ohm resistor or a couple of resistors to make up 24ohms and stick it in series on one of the power wires to the stungun circuit.
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Unread postAuthor: integral » Tue May 15, 2007 5:00 am

Fan and spark in parallel, the spark in series (taken from above) with 24ohm resistor. Switches on both circuits, so either can be operated independent from each other with only the one cell.
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Unread postAuthor: jimmy101 » Tue May 15, 2007 10:11 am

A resistor in series with the stun gun won't drop the voltage to the level you want unless you know exactly what the input impedence of the stun gun is. Note that the stun gun has an input impedence and not an input resistance since the current draw is not continous as the stun gun is an oscillator.

Assuming the stun gun is a 9 volter, by far the easiest solution is to just run both the fan and stun gun from a 9V battery. A 12V fan works fine at 9V. If total power is a problem, e.g., running the fan draws too much current and the stun gun won't work with what is left, then use two or more 9V's wired in parrallel.

Another option is to use a 9V regulator, such as an LM7809, to drop the 12V down to 9V. Pretty simple to do but really a lot more complex than is needed.

Another option whould be 12V battery+ -> 20~100 ohm resistor -> 9V zener diode -> back to battery-. (<A href="http://www.allelectronics.com/cgi-bin/item/1N4739/205500/9.1V_1_WATT_ZENER_DIODE_.html">Here</a> is a 9.1V, 1 watt for a quarter)
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Unread postAuthor: ArticWolf » Tue May 15, 2007 1:59 pm

My remote setup on my cannon which is seprete from the cannon on 25 feet of network cable and runs both my fan and my stun gun at 12 volts at 3 amps and it hasen't burnt it up yet. And thats with a power plug for my notebook and it work's in the field off of a 12 volt power wheels battery and I think it is rated at 12 volts 9 amphours and the stun gun still works.

It's just a quick tap of the button so I don't see what the problem would be with 12 volts. You don't have to take my word for it, other's and mabe you might have a different stun gun than me, which is a 650KV cheetah stun gun gutted (no inside's but the sparker part) I tryed mine on 9 volts first and all it did was wine, I hit it with 12 volts and it worked. Oh yea I think that stun gun's need at the least 1 amp of power too. Which could be most people's problems. But that is my point of view but I am just trying to help

Sorry mate if this wasn't close to what you needed but I tryed.
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Unread postAuthor: sjog » Tue May 15, 2007 3:24 pm

Thanks all you guys, very helpful.
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Unread postAuthor: kingjames488 » Tue May 22, 2007 10:21 pm

or you could just toss the stun gun thing and try out an ignition coil...
they run on 12v, big sparkes too.
would need a large batery tho.
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