# Help circuit for project idea.

Discussion in 'General Electronics Discussion' started by conrad141, May 10, 2012.

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May 7, 2012
So I'm working on a project and I have only a little background in electronics. Here is the main idea:
• Two AA batteries are wired in such a way that the output is approximately 1.4v and 16amps.
• A variable resistor allows the output to be adjusted from nearly 0 to around the above output.
• Something allows the device to be adjusted to accommodate different kinds of AA batteries (1.2v v.s.1.5v v.s. 3v)
• This is all fairly small and will not produce too much heat.

I'm especially stuck on how to make the device be able to accept different kinds of AA batteries, would I simply use resistors attached to an adjustable switch.

Thanks for helping out a noob, I hope I explained everything well.

2. ### (*steve*)¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥdModerator

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Jan 21, 2010
16 amps -- Seriously?

3. ### War_Spigot

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Feb 20, 2012
I agree with Steve, drawing 16 amps you're probably going to have a lot of heat, and even with super high capacity AA's, you'll get maybe 20 minutes at most.
How are you setting the output voltage?

4. ### davennModerator

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Sep 5, 2009
ummmm really ?

you are not even going to get 16 Amps out of a couple of AA batteries

welcome to the forums

its not going to happen mate AA batteries cant supply that amount of current.
With two batteries in parallel you may get ~ 1.5A for a short time

D

Last edited: May 10, 2012

3
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May 7, 2012

The project is a external battery for a device that usually gets around 14-15 amps from a single AA battery. Yes, it doesn't last long, that's why I want it to be able to accommodate NiMH (1.2v) and also stock batteries (1.5)

6. ### War_Spigot

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Feb 20, 2012
14-15 Amps from a single AA? How? I just hooked a fresh one up directly to my multimeter and only peaked at around 5.5. It stayed at ~5.2 for ~10 seconds and then dropped quickly after that. Assuming you can get that much current, though, what kind of device is it and how do you plan on varying the voltage? When you say "variable resistor," I'm assuming a voltage divider, is that correct?

7. ### timothy48342

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Nov 28, 2011
Whatm is the device? What device "usually gets around 14-15 amps from a single AA?"
--tim

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May 7, 2012
The Magic Flight Launch box. It basically shorts out a battery and uses it to heat up a simple heating element (mesh screen).

9. ### (*steve*)¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥdModerator

25,491
2,833
Jan 21, 2010
You might get it from a NiCad...

10. ### BobK

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Jan 5, 2010
WTF? Is this some kind of drug paraphenalia?

Bob

11. ### donkey

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Feb 26, 2011
its labelled as a "vaporiser" but all the links i click on say people who bought that als bought a "herb grinder"

12. ### jackorocko

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Apr 4, 2010
a vaporiser is what medical marijuana users use to release the THC from the weed and not burn the other material. It heats up only to a given temp, like 150 degrees or something. So yeah, it is drug para, not that it matters.

13. ### BobK

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1,688
Jan 5, 2010
Okay, makes more sense now.

Bob