USB to AA converter?

Basically, I want to power a small AA device from a usb port, preferably terminating in something that will fit snugly into the two-AA receptacle. I searched the archives, but couldn't find an equivalent project. Any assistance would be appreciated. Thanks.

Posted by J0ub3rt 1 year ago


How to make a own 5 X AA battery holder?

Hi guys, I have tried looking around to buy a 5 x AA battery holder but unable to find one. As such, how can I make my own 5 X AA battery holder? I have a 4 x AA holder and a 2 x AA holder.. Is there any way to combine this two and make it a 5 x AA holder? Or can I use a 6 x AA holder and modify it to a 5 x AA holder? Thanks for your inputs.

Posted by kurtselva 5 years ago


Psp external battery

I was wondering if anyone knows how to make a external battery pack (via adaptor) and make it so it will run from the battery pack. my concerns are: matching the voltage and mAH. as well as ensuring the safety of my psp i know that i already need the plug for the psp from the ac adaptor, anything else? also if possible, keep it as cheap as possible.

Posted by Dmanthe1 8 years ago


nichrome wire

I got some nichrome wire off eBay, and it works great but when I connected it to a 9 volt battery it barley got hot, then I attached it to 4 x AA batteries and it got red hot. why is this? I don't understand because the 9 volt gives out 9 volts(duh) , but the 4x AA batteries only gives out 6 volts.

Posted by Jordo 10 years ago


This is like having an AA meeting in a bar

Seriously...it is! Thoughts?

Posted by Lithium Rain 10 years ago


AA to USB charger

Can someone provide me with a schematic for a AA-5v USB charger, either using 2xAA or 4xAA, using parts available on ebay UK (and no programmable chips), much like the mintyBoost, but the chip isn't available in the UK.

Posted by andy70707 7 years ago


AA battery charger

Hello I have a bunch of AA rechargeable batteries and would like to use them. I could just go out a buy a charger but wheres the fun in that. I would like the charger to be close to the ones you buy, but of course with the instructables finesse. it needs to charge at least 4 at a time and tell me when there charged with an LED indicator. id like to see if it can be plugged into my USB port and charge. Thank You John F.

Posted by jwflammer 7 years ago


Solar panel and battery charging/discharging

Hi, I am trying to power some LED decoration from a small 6v solar panel. However, I would like the LEDs to be also on during the night, so working from batteries during night time. I have connected in parallel 3 x AA batteries (800mAh each) to my solar panel (6v, 500mAh), with a diode in between to avoid the battery discharging to the panel. Voltage is fine, and LEDs are working, but I am not sure if during the day, the solar panel is powering the LEDs and charging the batteries, or if the batteries are discharging all the time. If the solar panel is providing more current than required by the LED, does the excess current go to the AA batteries? Is it harder to charge AA batteries compared to AAA, apart from the capacity (mAh) being higher and therefore taking longer? Do I need more mA to charge AA batteries? Thanks, Seb

Posted by SebastienO 4 years ago


Wondering what I can do with this hollow cathode tube...

I've got this hollow cathode tube from a spectra aa machine (used for metals analysis). It was supposedly still working - my old boss at the lab I worked at found it and considered tossing it out as they no longer had that AA machine (they had upgraded to an ICP/MS), but knows I collect interesting looking things. Am I right to assume that cathode tubes are quite dissimilar to the variety of tubes used in vintage amps and of no use in that regard? Does anyone know what sort of power I'd be looking for to even get this thing to light up? On the plug at the end of its cable, they posts are labeled A through F, then H, J, and K.

Posted by incredibleweirdo 9 years ago


AA Smartphone Charger

Is there a way to charge a Smartphone using a single AA battery? I already have a DC-DC booster to 5V but the current is not enough to charge the phone, can someone please help me with this?

Posted by Wihand 2 years ago


Cell phone battery

My friend gave me an old cell phone, with no battery. (No it does not have service). I don't know if it even works. It is a Motorola i860. Where the battery goes are four pins. How can I connect a AA, or AAA, etc battery to it to see if it works. The first time I tried it, it got real hot and then the battery smelled like it was burning. The second time it sparked. Is it even possible to do this? If it is, I need to know the voltage, polarity, and what pins to use.

Posted by popit 10 years ago


Solar AA battery charger

Hi i like to build a solar AA battery charger with a indicator that show me it is full, is there a way?

Posted by lSoonl 8 years ago


Question about converting a 9v Battery Gadget to AA's.

Hi. I have a Boss DS-2 distortion pedal, but my problem is, it drains the 9 volt batteries like a semi-trailer. So I basically wanted to convert it to AA batteries. Technically speaking, I'll need 6 AA's to make 9volts, but 9 volt batteries have a different current don't they, or will that not matter in this application. I'd also like to insert an on/off switch because it drives me crazy that the only way to remove it, is by pulling out the 'input' cord (guitar to pedal). Please respond if you know the answer.

Posted by Noodle93 10 years ago


HOLOWEEN RED WHITE & BLUE on One AA

Here is another blinking LED running from a single 1.5 AA battery. While the white and blue LEDs need over 3 volts. The white blinks in the transition moments between red to blue and to red !

Posted by iceng 4 years ago


AA Battery replacement

Hi, So I have a AA battery pack inverter for some EL wire, and I was wondering if it was possible to replace the AA battery's with a lithium Ion battery to reduce its size. What kind of voltage should I look for/do I need to take into account amperage?

Posted by Fozzibehr 4 years ago


AA or AAA Solar Battery Charger from Deer Feeder Solar Panel

Would it be possible to build a solar battery charger (AA, AAA or both) using a solar panel designed to run a deer feeder?  If so, how would one accomplish this?

Posted by leechild73 7 years ago


replacing AA's with lithium?

 Hey I have a cheap camcorder that runs on AA's but I want to put it on a lithium battery. What I want to use is just the standard battery out of an old phone 3.2v, I'd like to use these because I have a huge surplus of them. I have pretty much no knowledge of electrical circuits and so I need of bit of help. I know two AA's is 3v and any lithium battery is 3.2v, how could I step the battery down to 3v?

Posted by problems 8 years ago


how do I convert 2 AAA batteries to AA

I have an electronic device that uses two AAA batteries internally. Instead of replacing them every couple hours, is there a way to use AA or other batteries to extend the life? The AAAs are encased in a closing lid, so there's no room for AAs but I am thinking there should be a way to solder some wires to connect them. On the slow drain usage, the 2500 mAH AA should last 2-3 times as long as the 900mAH AAAs. Is this correct? And is there a way to put more batteries in battery pack [series or parallel] without frying the device? Thanks for any feedback.

Posted by kingant 11 years ago


Only AA, AAA, C, and D?

Can we only use the types of batteries listed in the Sanyo Eneloop Battery contest's description for the power source in our projects? My 9V clip flashlight technically uses a 9V, but it can also run on 2 AAs. Also, what about N's and the like?

Posted by Radioactive_Legos 10 years ago


12v power supply using AA batteries help

Hello!  I would like to power my arduino using a 12v 1A power supply, can i achieve this by using 8 AA batteries? Or would that not give me 1 amp? The arduino only draws around 50mA i believe.  Thanks in advance!

Posted by lelegriccioli 4 years ago


wath machien works on 1 AA batary for more then 2 months ?????

hi I'm looking for some kind of machinery or construction that works on only 1 AA battery for as long as possible and that has a constant movement witch i can see like a clock's second pointer i must be able to build it myself (i have electronically experience) and it must be low cost thanks in advance

Posted by ayan 11 years ago


a few battery questions

I got 2 questions1st. i was shopping at target today and noticed that the big energizer rechargeable "D" size batteries has the same mAh rating as the smaller "AA" rechargeable energizers i have at home (2500 mAh) can any one explain this?2nd. i've seen some pics around the site of custom "D" sized "AA" battery holders that hold 4 "AA's" in a "D" sized space ( https://www.instructables.com/id/SA59T0CFB11L31B/ ), but i haven't seen any instructions on how to make them. can some one make an instructable about this? (preferably one that can be made to hook up the" AA's" in parallel)

Posted by clasic_traveller_diehard 10 years ago


small solar panel,charge aa batterys,control voltage to unit.

Hi,I bought a acu=rite weather forcaster.Model 00638.It works good but when i bought it i thought i would use my rechargeable batterys.The book for this unit says no rechargeables because of higher operating voltages.The home unit uses 3-aa batterys and says 4.5 v. i have an outside sensor that has 4 aa batterys,i dont know what the voltage is there.          I would like to hook up a small solar panel to each and make it so i can leave in my rechargeables and not exceed the input. ideas?

Posted by ron17571 7 years ago


M4 Carbine Assualt Rifle

ITS FINISHED!!!!!!  CHECK IT OUT HERE!!!!!!

Posted by MotaBoi 9 years ago


12v 1.8w solar panel to charge AA 1.2v NiMh batteries

Would i be able to use a 12v 1.8w solar panel to charge AA NiMh batteries? i built one of the mr16 halogen bike lights with the instructable found here and now have 10 AA NiMh batteries that i would like to charge, and i only have a 4 battery wall charger. A 12v 1.8w solar panel is on sale for $15. its specs are: # Includes quick-connect hardware: connecting wire, DC clips, 12 V socket plug and barrel plug, mounting hardware/accessories # Built-in reverse current protection; won't deplete the power-supply system so can i use this to charge AA batteries? if so how many, 2,4,6,8,10?. i would want to keep it simple so i would just wire my battery holders to the panel if possible.

Posted by ThePopesBone 11 years ago


What can I do with my dead AA batteries?

Besides throw them away.Edit: Or make them into art. You can make anything into art, so that's a given.I have both rechargables and non-rechargables. And I can't be the only one with a buttload of dead batteries idly lying around the home left over from the 90s.

Posted by bodybreak 11 years ago


(newsletter) Treadmill Desk, AA USB Charger, Sand Fire Garden

Double Capacity USB Charger Treadmill Desk Sand Fire Garden DIY USB Oscilloscope Riveted Maille DIY Lockring Pliers Rustic Hammock Chair Stylish Sofa Bed Drilling Glass Guides Instructables Robot Projects Exercise Lamps Instructables.com - 82 2nd St. - San Francisco, CA

Posted by fungus amungus 8 years ago


How to determine remaining hours/days for a AA battery source?

Hi guys, I am building a low battery indicator which lights up a red led when the voltage remaining is 2 days before the battery dies. The device draws about 1ma all along and 50ma for about 10 seconds every 6 hours. So how do I check when the battery would have enough voltage to last for 2 more days? i have attached the battery current performance 

Posted by kurtselva 5 years ago


Inkjets

So, I just saw this:http://www.youtube.com/watch?v=aA-uN2Dmn0MI know there are inkjet refills for sale..so why couldn't we make our own ink? Maybe starting with pen refills?

Posted by Weissensteinburg 11 years ago


Charging batteries via a 5v USB connection

I am working on a project that requires 4 AA batteries. I would like to discuss if it is possible to create a charger that would charge the batteries (rechargeable AA's of course) via a 5V USB cable. The unit itself would not need to use the 5V USB power to operate, just to recharge the batteries when not in use. Does anybody know if this is possible? Please let me know if this a vague question, as I am in no means a professional in this area. Thanks in advance to any insightful comments!

Posted by honduhridr 11 years ago


how can i charge this? (capacitor)

I have a camera capacitor i need to charge. (not for a tazer). it 330wv, 120uf. how can i charge this. with a aa battery and a resistor? any ideas?

Posted by DELETED_DELETED_kruser495 11 years ago


making a IR Light

Im planning to build a IR light using 10 IR leds in parallel with a forward voltage of 1.2 and a forward current of 100mA and five 6.8 Ohms resistors. Will 2 AA batteries be enough for this Thanks

Posted by specializedrider 9 years ago


LASER pointer keychain Question ???

I'm taking apart my laser pointer keychain, I want to run it off of normal batteries like a 9v or AA. What would be equivalent to the 3 1.5v cell batteries?

Posted by mrshow555 10 years ago


led n00b here, need a little help

Hey guys i am new to electronics and figured id start with leds, my first project will be to make a torth from a penguin caffinated mints tin using some domestic batteries, some Super bright (17000mcd) 3v Green LEDs and 10 resistors only described as "Used to operate a 3.3v LED on a 5v Power Line. " and the same for the 10 12v resistors. now can anyone tell me. when would i need a resistor in my circuit? (i know the one for the 12v line would be perfect for arraching to a car battery and not killing the led.) but the 5v resistors? when would i use them? when i make this torch i will be using 2 or 3 aa batteries, 2 aa batteries make 3v and these leds are meant for 3.3 so im assuming i wont need a resistor however if i used 3 aa (4.5v) would i need the 5v resistor or would it be to much? im sorry im confusing thanks

Posted by Cew27 9 years ago


Batteries and LED light modules - correctly powering for maximum life

Hiya, I need to power a LED strip of 3 LED lights with batteries. The LED box says it is a 12VDC light module, and on the back of the box it says the Input Power is 0.0453A. My limited understanding is that I should use a 9V battery plus 2x AA battery (I have limited space - a 8 AA pack wont fit inside my project)...is that correct? I need to know how long these batteries will last - if it is less than 10 hours can you suggest another way of powering it? I'm incredibly lost and very new to understanding all of this! Thanks in advance. 

Posted by SonyaS2 4 years ago


Help with electromagnet

I have made an attempt to make an electromagnet.I got a 10 inch iron rod with insulated copper wire wrapped around (see image)I didnt have enough wire for the whole rod, so the wire is in two seperate sectionsI tried a AA 1.5v battery, two AA 1.5v, a 9v, two 9v and a big 6v plugged in both ways (negative, positive).None seem to work.I thought it may be the two sections connected together, so i tried all the above batteries again on only one section, and it still didnt work.Can anyone help me out here ?

Posted by oxidase 9 years ago


6v solar panel for charging

Is a 6v solar panel (260 mah) enough to charge 4 AA NIHM battery? The four batteries in serie amount to 4,8 volts, and  fully charged they can amount to 5,5v. I'm planning to add a diode, that can drop the voltage by 0,2v.

Posted by jemor143 7 years ago


Modified RC car

I've been working on this sucker, and I have so far added a battery pack to it that consists of 8X AA NiMh rechargeables and it goes like sh*t on a stick! 13v when it's fully charged! Check it out! Wheel cam:

Posted by Punkguyta 8 years ago


Battery powered router

I have a small wireless router that is fed by a ac adapter spitting out 5v, 0.2 amps of DC current. Does anyone know how I could substitute an equivalent battery back for the adapter? Would linking some AAs and a transistor with the adapter output plug be enough?

Posted by phildini 11 years ago


alkaline batteries connected in parallel, quick question

Okay, doing some throwie-inspired LED "artwork" and I'm using alkaline AA batteries instead of the CR2302s or similar smaller cells to get way more mAh and extend the life of my display. I've got all the proper resistors and AAs connected in series to get the right voltage, etc... but I want to rig up a second set of AAs in parallel. I've found a few posts and websites talking mainly about lithium cells and/or specifically rechargeables connected in parallel, but nothing on alkalines. I know to make sure they're of the same make, type, not to mix new and old (aka the same mA)... but will leaving parallel alkaline batteries connected until they are all used up cause any problems, possible fires, leakage, plagues, end of the world? I've found one web page talking about if one of the cells in parallel was lower in mA (or maybe only if it's faulty?) it could drain faster and possibly short, draining the energy from the other cells, possibly causing a fire hazard... Not good for my artwork or the places it will be displayed. Any thoughts would be greatly appreciated. Thanks for the help!

Posted by shanepollard 9 years ago


Voltage boost

I'm trying to make a remote shutter release for my large format lenses. I found a solenoid that will do the trick. It's 12v / 36 ohm push solenoid with 3/8" travel. I prefer to drive this thing with a single AA battery. Is there a simple way to boost 1.5v?

Posted by JonLoder 5 years ago


USB pinouts

Would it be possible to buy a 4x AA battery relay from Radioshack and splice the output into a Micro USB cable to make a 6 volt emergency charger for a smartphone? Or do I need little electrical bits (resistors or somesuch) in between the output from the juice pack and the +5v pin on the USB? Thanks.

Posted by Miriax 7 years ago


My instructable post

Okay so I made an instructable and published it and everything but it still has Zero views and i posted it aa while ago. Also Whenevr i log out of this account and then try to find my instructable i can not find it. It my instructable private it to me or what. Whats going on. Thnx

Posted by north33 7 years ago


Rechargeable Battery Help?

I'm sick of throwing away AA batteries, and I go through a lot with my camera flash. The only rechargeable, multi purpose batteries I've used were some generic energizer ones I got some years ago, so I need your recommendations.I'm willing to spend a bit more for a quality charger/batteries that will last. For batteries, I'd like to support Eneloop, as they sponsored an instructables contest in the past. They are significantly better than Energizer/Duracell, right? How does Rayovac compare in price/power?For a charger, I was looking at the the BC-9009 by La Crosse. It has good reviews, charges slowly for a slower drain, prevents overcharging and has all sorts of other features. It comes with 4 AA, 4 AAA batteries and a case for $40. See it here:http://www.amazon.com/Crosse-Technology-BC-9009-AlphaPower-Battery/dp/B00077AA5Q/ref=sr_1_1?ie=UTF8&s;=electronics&qid;=1251579646&sr;=8-1I don't know how good the la crosse batteries that it comes with are, though. The BC-700 would work fine and can be bought alone for $30.For packaging reference, I need to have at least 8 AA batteries, but would definitely use any extra AA or AAA that might come with it.So, what do you have to suggest? Thanks!Update: I read that energizers may be better than eneloops for things that use a lot of power quickly (like a camera flash) while the eneloops are better for things that use it slowly (like a remote control). Is that true? I'm concerned about getting batteries that will store a lot of electricity over many charge cycles, but not so much about them holding a charge during storage.

Posted by Weissensteinburg 9 years ago


USB Charger Question...

Ok, I have a (4) AA battery holder which is wired in series so that I get 6V. I was then going to use (3) LM7805 regulators in parallel with heatsinks because a AA battery has approximately 2600mAH and each 7805 is rated @ 1A... I tried using (1) 7805 and it was so hot it burn my finger (BAD!) I'm making this device to power a Motorola V3 Razor. I guess my question is if this will work or not, the more I've been reading the USB standard is 5V @ 500mA... Just because the batteries are rated @ 2600mAH does that mean that they will put out that much power? Or will the phone only draw as much power as it needs? I can't afford to use this phone as a test! Please only respond if you know for sure - someone with an EE degree would be nice ;) Thanks in advance!

Posted by 02gsxr600 11 years ago


Hack a laptop battery?

I have like 4 broken laptops laying around and i have been trying to decide what to do with them.  I had this thought and looked up some information about it.  In the battery is basically like 8 AA rechargeable batteries.  Well these broken laptops in question no longer charge their batteries.  I know i can crack open these batteries to get the AAs out.  But is there anyway to charge them once they are out?  I would be comfortable soldering if I have to.  I am very new to these instructables, but I know my way around electronics to fix them.  But this idea has me stumped.  But this could also give me a crap load of rechargeable batteries for my sons toys.  Thank you in advance for any information you could give me.

Posted by jcaresheets 7 years ago


12 VDC

AC -> 12v DC, 1000mA Output -> Halogen Lamp = Nothing.DC -> 12v DC, 10 AA Batteries -> Halogen Lamp = Works fine.Yes, the wall adapter works.Why does the Halogen Lamp not accept the current?@ 6v, 5W (0.83 Amps, right? Just under the AC output..)

Posted by NarNar 9 years ago


Error 400

Hola tengo un error 400 en este post que acabo de subir al foro en la sección de eventos, espero puedan ayudarme https://www.instructables.com/community/1%C2%AA-Build-Night-por-Sugru-en-The-Inventors-House-/ Gracias de antemano

Posted by sabas1080 5 years ago


AAA Usb Charger Help

I just bought a new Sansa e260 and I've been looking at these usb chargers but they all use 9v or AA and i have a ton of rechargeable AAA battery's, There 1.2 v so 5 will be 5v. Will this work if i just make a case draw the power from them out via usb?

Posted by LeetLandon 11 years ago


Mechanical Cover Flow

I was thinking of a project for a type of shelf for your CD jewel cases. It would be a way of presenting CD covers in a similar way to iTunes 7's cover flow. (see http://upload.wikimedia.org/wikipedia/en/a/aa/CoverFlow_Screenshot.png) You could mount the cases and have a slider to flip through your CDs. Anyone know how this could be achieved?

Posted by spinach_dip 11 years ago