# Dual Ipod Charger

3 Steps
I have both an iPod and an iShuffle, I don't want to have to bring a laptop along on a trip to just to charge them. This will charge an iShuffle or an iPod with firewire connector.
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## Step 1: Parts

Parts:
2 x 1k resistors
2 x LEDs
USB female socket
Firewire female socket
elinventor21 says: Jul 12, 2010. 7:22 PM
hey man nice project but where r the schematics?
stackemtotheheavens1 says: Jun 26, 2008. 11:55 AM
I built this, and when I add power to it, the ipod turns on but it does not show that it is charging. I checked the battery, and its full 9v. any sugggestions?
Gjdj3 in reply to stackemtotheheavens1Jul 10, 2008. 7:49 AM
Do you have an iTouch or iPhone?
stackemtotheheavens1 in reply to Gjdj3Jul 10, 2008. 8:14 AM
no, its an ipod classic.
Sitnalta in reply to stackemtotheheavens1Aug 30, 2008. 11:41 PM
You have to build a small circuit of resistors to fool the iPod into charging. I'm actually going to publish a small instructible that details this. However I will try to explain as best I can without a visual aide. Ok, you will need 4 resistors. Two of them at 49.7KΩ (we'll call these R1), one at 43KΩ (R2), and one at 74.9KΩ (R3). These are ideal values and so it's ok if they're not exact (for instance, I used a 47KΩ for the first two resistors) you can also connect resistors in series to get the right values. Ok, here we go. Step 1) Connect R2 and R3 end-to-end. Connect the 5V+ line inbetween them. Making a "T." Step 2) Connect the two R1's to the free ends of R2 and R3. Extending the top of the "T" in both directions. Then connect the free ends of both R1's to ground (-). Step 3) There are two data lines in the center of the USB port. They are called D+ and D-. Look online for a schematic for which pin is which. Connect D+ in between R3 and R1. Connect D- in between R2 and R1. Now test. You should be getting around 2.5V out of D+ and around 3.3V out of D-. This may seem scary high, but trust me, this is in the USB spec. This is how the iPod knows it's OK to draw the power it needs to charge.
agis68 in reply to SitnaltaFeb 28, 2010. 8:32 AM
Ipods need 4 cables to charge from the USB and of course a hole circuit with divider and other things...I will give you a diagam when i found it in my huge collection
agis68 in reply to agis68Feb 28, 2010. 9:22 AM
ok I got it...
Andruha1123 in reply to SitnaltaNov 21, 2008. 3:27 PM
would this work for motorola cellphones?
agis68 in reply to Andruha1123Mar 11, 2010. 2:52 AM
definitely yes
Jon316 says: Apr 27, 2009. 2:12 PM
can i use any bread board or the one you showed cause i found one on radioshack online it called Modular IC Breadboard Socket can i use this one
Da_Fudge says: Dec 10, 2007. 4:33 PM
OK... 2 things I saw that I can't work out. In step 2, it says feed 12V into both regulators. That won't work. for a normal 7812 regulator to work, you need something like 14V MINIMUM for them to work. even a low-dropout 12V reg needs ~ 12.5 minimum to work. Also, in step 3 picture 1, you have the 12V regulator on the USB side and the 5V reg on the firewire side.
Derin in reply to Da_FudgeJun 21, 2008. 1:45 PM
you could replace the reg with a 12V zener then...it will work from 12V to infinite volts
Yerboogieman says: Feb 7, 2008. 9:23 PM
i liked this alot, and im making one alot like it but with capacitors
mollygear says: Sep 15, 2007. 9:36 PM
i think, if you have an apple USB wall brick charger, you could plug a USB hub into it, and charge as many iPods as you like on it
jongscx in reply to mollygearOct 29, 2007. 12:56 PM
not necessarily, some cheap hubs only split the signal and not the voltage... they assume the devices are self-powered, like printers and scanners, and usb blenders.
Yerboogieman says: Jun 27, 2007. 11:05 PM
would 2.2k resistors work?
Dark says: Apr 20, 2006. 12:32 PM
Very nice. Did you consider putting it inside a case, such as an altoids or such. Also, could the USB be powered by a 9v battery?
KdoggFunkstah in reply to DarkApr 20, 2006. 12:48 PM
should be able to, however the firewire port will not have sufficient voltage coming out of the regulator. Don't know how long that'll last you and how much battery it will recharge on the other end. What a battery would probably do is just transfer its own electrons in its battery into the ipod's battery. correct me if i'm wrong, but if an ipod's battery capacity is larger than a 9V (which i think it is), then I don't think you'll be able to fully charge your ipod w/ an external battery :-p
I thought the ipod batteries were around the 3v ish range
somewhere around the box or the manual it came with it lists the voltage range
Could you wire two 9v batteries together and power the firewire port? Because I have a third gen pod, which only charges via firewire as well.
timc says: Dec 11, 2006. 4:36 PM
Can anyone help me _ I have tried to replace screen on 30gb video ipod but one of the orange wires has come adrift and I need a circuit diagram to know where and how to reconnect it. HELP PLEASE!!!!!!!!!!!!!!!!Tim
APOCALYPTiC ONi in reply to timcMay 5, 2007. 4:45 PM
you cant. i looked into it with mine. even if you could figure out where it went, the connections are so small thast they have to be done by very delicate machines. the human hand just isnt steady enough.
gjenny says: Jul 23, 2006. 11:10 PM
from spec of ipod, it can support USB2.0 to be used for ipod charging. it is said for charging ipod by USB port, it needs 5v 500ma(usb 1.0) or 5V 100ma(usb 2.0). I am not sure that, does anybody has experience with 100ma USB charger?
gojukebox says: Jul 11, 2006. 10:24 PM
Could someone please draw a quick (labeled) wiring diagram for the less intelligent?
hjjhjhgjjh says: Jun 20, 2006. 9:28 PM
I love it. I have a lot of ipods and I usually have like 3 chargers around now I can do it all in one. Good Job. Keep up the good work my man.
hjjhjhgjjh says: Jun 20, 2006. 9:28 PM
I love it. I have a lot of ipods and I usually have like 3 chargers around now I can do it all in one. Good Job. Keep up the good work my man.
rsz says: Apr 30, 2006. 3:24 AM
It seems you can use either USB or FW to charge the 4G or 5G docking iPods, as well as the mini. The shuffle only charges with USB, and 3G and earlier iPods charge only with FW. This site was helpful:
http://ipodbatteryfaq.com/ipodbatteryandpower.html

RSZ
ollie in reply to rszJun 20, 2006. 10:34 AM
thanks rsz, really helpful. i should have looked at this link first before i assembled my own 7805+9V USB charger only to find out my 3G ipod will only charge via FW. :-(
syko82 says: Apr 20, 2006. 6:40 PM
I built a very similar 5V charger for my Nano. You are forgetting some caps before and after the regulator to even out the voltage from spikes. The only problem is that it doesn't seem to charge the iPod while playing, it only keeps it from using battery power. I have yet to hook up an amp-meter to see what exactly I'm supplying / pulling. I don't think charging and playing is possible with 5V. Maybe I'll have to make it charge on the 12V lines so it works better. Cool design to do both though.
mart100 in reply to syko82May 19, 2006. 7:28 AM
syko, i have also built a 5v USB charger for my nano. to make it charge though, you have to fool the ipod into thinking it's connected to a computer. to do this, connect a 1K resistor across pins 2 and 3 (centre two) on the USB connector. the pod takes about 15 seconds after connecting to decide there is no computer on the other end and to start charging anyway. alternatively, just turn the pod off after connecting and charging will start immediately.
mart100 says: May 19, 2006. 7:24 AM
syko, i have also built a 5v USB charger for my nano. to make it charge though, you have to fool the ipod into thinking it's connected to a computer. to do this, connect a 1K resistor across pins 2 and 3 (centre two) on the USB connector. the pod takes about 15 seconds after connecting to decide there is no computer on the other end and to start charging anyway. alternatively, just turn the pod off after connecting and charging will start immediately.
ranex says: Apr 24, 2006. 1:37 PM
usb is only 5volt though so the ipod nano is only designed for that- id be carfull you might break you ipod there
heiko says: Apr 20, 2006. 2:23 PM