Have you haver need energy for charging your mp3, cellphone, etc. when you're out of home?!
I had.. So i decide to describe how to build your portable charger.
I hope to be useful.


Step 1: What you need


- 5v regulator (i used a 7805)
- Small piece of velcro
- USB female port
- 9v battery
- 9v battery attach
- A box (i used an old burned modem)
- Hot glue (optionally)
- A solder
<p>how many times we can charge our cell phone if its 2600mh</p>
<p>is it easy to use 4 rayovac rechargeable aa batteries instead of a 9v. if so how do i make it work. and does it use the same parts. if not please tell me so i can get them. thanks</p>
hi sir i do this but its work very very slow plz tell me what i do
My device is showing the charging light but the status says not charging everything is hooked up correctly.
will this work for samsung galaxy devices which require 5v to charge.
can i buy like that on DIY shops.?
I believe a 9 volt battery is just a case with 6 - 1.5 volt AAA batteries inside it. Why not just make your own case with the correct number of batteries in it?
Great Job
DO NOT TRY THIS!! haha but really don't! it was the easier of the 9 volt chargers and it just fried both my samsung rant and ipod touch 1st gen.
If it destroyed one of your devices,why did you tried again?
it works great for my mp3 :)<br>i even did a wall charger, and WILL DO a car charger too! :)<br>have fun! :o)<br><br>thank you!<br>marC:)
this sucks it does not work
there are some similar instructables on this site , but they all use resistors and/or capacitors, so why do they do this if it isn't necessary? this somehow still has to have a reason doesn't it ?
io l'ho fatto '' https://fbcdn-sphotos-a.akamaihd.net/hphotos-ak-ash4/s720x720/376429_280293018672192_100000744891526_949761_483419674_n.jpg '' ma 100mA non bastano per un cell, ce ne vogliono almeno 400mA oppure per il mio 550mA.... ho visto qua ma non so se funziona, non sono esperto in elettronica http://www.national.com/mpf/LM/LM78M05.html#Overview
It works 100% i made that you can charge with 4 AA baterries or 1 9v baterry
nice! but using a voltage regulator is wasteful as it will convert excess power to heat
Instead of charging up this way why wouldn't you just connect the 3 AA batteries in a series to your phone directly at the + - terminals that correspond to the + - signs on the battery and then use it immediately without burning up your battery? You'd get a lot more amp hours out of rechargeable AA batteries than your factory battery I bet, and you could probably even use your phone charger to recharge the 3 AA batteries if you leave them hooked up.
A voltage regulator? This will waste tons of energy.
does this work with a forth generation ipod touch?
I'm italian too!!! I have a question...i have to build a charger like this one but i must to charge a mp3 and it's 3.7v do i need a different regulator? if the answer is yes which one? thanks
i forgot... where can i find a female usb port without break my pc? thank you again
you can buy a usb extension cable and cut it off. http://usbextensioncable.com/
Try an electronics store for the female usb plug, and for an adjustable voltage regulator.
Very good instructable. I tried making this and i have everything wired exactly but when i plug in my phone, the phone turns off and wont charge. I used a volt meter and confirmed the 5VDC output. Can anyone help please? My email is <a href="mailto:dan4954@gmail.com" rel="nofollow">dan4954@gmail.com</a>.&nbsp; Any help would be greatly appricated.
are you sure that the pinout is the proper one? female pinout http://pinouts.ws/usb-pinout.html
this is a very good charger.thanks for share it.
i love this but can u make a new 1 with a switch ????
Well making one with a switch is really simple you see. Take a switch. It has three prongs on it for soldering to. You only need to on either side (this side will be the on side, the other off.) now where the connecter for the 9v battery is you will use the red wire. Cut it and trim the plasticy/rubbery coating off to reveal the wire. Now connect it like this: [URL=http://img29.imageshack.us/i/helprf.png/][IMG]http://img29.imageshack.us/img29/7741/helprf.png[/IMG][/URL]
Of course you can, you just cut 1 wire in half and connect it with the correct positive and negative on it's side<br>
Hey, I was on paint and made a diagram for yall =J.:<br>
thank u 4 posting this i tried a lot of other vidios and everything and this is the only 1 that i could get thank u and good job with the pics
Hi, very nice instructable! But I have a Samsung Phone with a 3.7V Li-ion Battery. Will this work on my phone??? <br />
&nbsp;if it charges by usb when it plugs in the computer then yes and&nbsp;don't&nbsp;worry&nbsp;about the battery info as they will be&nbsp;charged&nbsp;and regulated by the phone, in other words, its like charging it on the computer.&nbsp;
Oh okay. Thanks<br />
Do you really need the green and white at all? or can you just snip them off?
just ignore them. they are the wires that carry data.
but you need them to charge iPods <a href="http://www.instructables.com/id/How_to_get_your_iPod_to_charge_with_your_homemade_/">http://www.instructables.com/id/How_to_get_your_iPod_to_charge_with_your_homemade_/</a><br/>
this is really awesome ill have to remember this one!
All you need from the USB cord is the Red and Black cable, as they normally are the two running the current. The other two are just for the Data running through the cable. A set up like this recharged my Game boy DS about ten times off a single 9v. I figure that the Cell Phone is more like five or six times.
beat me to it. Chazy, you should put a capacitor after the regulator as a filter as well. how many amps can the 7805 take? i dont recal. but if you wanted to you could put another 9V in parallel for those lonnnnnngggg trips. another tip. usb devices only use 5V/50mA, you should check how many amps the 7805 is outputing, ive used them before and some of my devices wouldnt charge because it was reading higher than 50mA.
1 amp. you can usually scavenge one out of a run of the mill pc tower power supply. i managed to get two out of two fried power supplies (was a blown capacitor in one and the other the board was kinda fractured. if you find a 7905 they do the trick too but the leads are different. if i can remember the ground and input are swapped. but still works like a charm.. and a LED from an older tower works great as an indicator light/Tester.
It depends on the model, usually they can supply 1 amp but some models can supply to even 3 amps. And a 9 volt battery isn't the best for this job, since their capacity is very low due to high voltage. A regular 9 volt has normally some about 500mAh (alkaline) to 1200 mAh (lithium) and USB devices can take a lot more than 50 mA @ 5V since USB-port can supply up to 500 mAh. So if you have a bit bigger USB-device, I recommend you get some nice 3,7 volt batteries, they can have a genuine capacity of almost 2500 mAh. Just put two of them on series and a cap to keep it steady and clean. I doubt there wouldn't be any need for regulator but it can be used for extra protection.
Oh and a one thing, the ratings that regulators have don't mean how much they give out all the time. Regulator gives out just as much there is draw, the rating just tells you how much is the maximum output.
Yes, the white and green cable are for the data transfert, but they could be in THIS CASE the ground too.. I FULLY recharged my phone like 14 times.. :)
Hey instead of putting a female usb port, could you just put the chord itself for your device
yes you could.. i made a simple usb to ac adapter for my version of one of these... so i can charger my older digital samsung and can still charge my iPod... . it uses a tiny ac adapter instead of a usb for charging.. works like a charm. all modern cellphones (or mobile phones to others) charge off the same current as usb. i hate having to get the proper cable for some.. Motorola is smart cause it uses a mini usb port. so a data cable for one dirt cheap
those voltage regulators get hot (waist energy) i might try to make a circuit using a joule thief.
joule thiefs only work at low mA, they are unregulated, etc... Also I don't think that joule thiefs are much more efficient... you need a boost circuit

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