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Help with iPod Classic USB Portable Charger? Answered

I've seen so many portable iPod chargers out there but I'm not that experienced to handle the electronics. So, what I wanted to do was to take apart old adapters and connect it with a 9V battery (with the battery slot from an old alarm clock) A couple of questions I have are..
-Does the adapter have a regulator to bring the 9V battery down to the proper amount of volts needed to charge the iPod?
-How much power is needed to charge the iPod?
-On the battery wire thing, which wire is negative, which is positive?
-Which wire (on the battery slot) is supposed to connect to which wire on the circuit?
-On the circuit board, which is negative, which is positive?

-(Relying on the informational sticker on the adapter) Circuit board input: AC100 - 240V 50/60Hz
-(Relying on the informational sticker on the adapter) Circuit board output: DC5V = 200mA
-More specs in pictures

Hopefully, the circuit board already has a regulator, to bring the 9V down to a 5V, so I wanted to post this to ask the experts on 'ibles to see if it probably has a regulator or by using the pictures.. thanks so much!

If you need more pictures of anything, just ask; thanks again for helping :D



Best Answer 7 years ago

While i appreciate the initiative to try and scavenge parts, this adapter is meant to take in 100 to 240 volts of AC as shown on the cover (rather than the 9 volts DC from the battery). This probably means that the adapter is not suitable for accepting 9 volts... (especially DC) The thing you labeled in one of the pictures as possibly the regulator is labeled "Q" something on the circuit board making it most likely a transistor. As for the ipod charging specs, it needs 5 volts at at least 100 mA (milliAmps). Lastly if you are new to electronics a great way to learn is to put together a kit or two and so i would recommend the "minty boost" kit from adafruit.(http://www.adafruit.com/index.php?main_page=product_info&cPath=10&products_id=14).

Hope it goes well

Is there anything else similar to MintyBoost? I noticed that it doesn't mention if it support the iPod 4th Gen. And, as mentioned in the 'ible, I don't have a soldering iron..

While it does not say it does 4th gen ipod it does say it does the 4th gen iphone, but alas there is nothing as neatly ready for assembly as the mintyboost. As for the soldering iron, if you are going to get into electronics, i would consider getting one.

just add a 7805 regulator and nothing else is needed

-(Relying on the informational sticker on the adapter) Circuit board output: DC5V ± 0.20V (On another line) DC400mA ± 30mA

That is the most important information.

It's fairly standard 'usb' power at 5v and near 500mA (400 in this case).

A 9v battery is a TERRIBLE power source - good for smoke detectors and that's about it, their total capacity is just rubbish.


There is a regulator to drop the 9v down to 5v - some are better than others, the cheapest of which will just burn off the excess voltage so that the 9v becomes 5. Pros -- simple and cheap - cons, beyond inefficient, wastes power and your batteries already start with crap power == bad.

Watch this video:

That is unless you use a buck converter, switching regulator or the like.

firstly you cannot put 9 v into an adapter and expect 5v out. you need at least 100v volts and it HAS to be ac. so all you need to do to down the volts from 9 to 5 is add a resistor. also, most electronic devices cant just have + and - to charge them, you need data+ and data - as well, that can easily be acheived by adding a 10kohm resistor to the plus and conecting it to data + and connecting minus to data minus, or at least im pretty sure. and lastly alot of devices need circuitry to make sure it does not over charge. hopefully my tips help

this schematic works brilliantly. i used 47kohms for r2 & r2 and 100kohms for r3 and it work really well. hopw this helps.

Schematics for charger.jpg

Yep definitly use Minty boost ;)

Go with the Minty boost and use solder paste if you really want to avoid a 10 dollar soldering iron