1437Views7Replies

Author Options:

DIY iPod Charger Answered

Picture of

Hi everyone, I want to make my own iPod Charger and I have already made a schematic for it, but now I'm not sure if everything is correct. So can you please tell me if there's something wrong with it or something that could be done better. Thanks, Lukas

7 Replies

user
arsi (author)2010-08-05

hey, i know this is kinda late (almost 2 yrs, hope ur still alive :P) but did this ever work out for u? as i'll be building one.... (unless you have copyright issues). thnx

Select as Best AnswerUndo Best Answer

user
lukas011 (author)arsi2010-08-06

Hey, Well it sort of worked out. There are a couple of things you would have to change in order to make this work. First of all you need to put resistors on the D+ and D- lines of the USB plug. This is so that the iPod knows that there's a charger attached to it. Take a look at this site to find out what resistors you need and how you need to connect them. http://www.adafruit.com/blog/2010/08/03/the-mysteries-of-apple-device-charging-video/ Then just read the comments from guyfrom7up. Everything he said is basically what you should also change to make this work. Also, if you're not sure of how to change all of these things you should take a look at the Minty Boost. http://www.adafruit.com/index.php?main_page=product_info&cPath=10&products_id=14 I haven't actually tried it out, but it looks like it's a good product. Hope this helps, Lukas

Select as Best AnswerUndo Best Answer

user
lukas011 (author)2008-06-11

Thanks for all your help!

Select as Best AnswerUndo Best Answer

user
guyfrom7up (author)2008-06-10

make sure you put a resistor in series with the led, something such as a 330 ohm would be fine. 1n4001 isn't necessary, as long as you don't put the batteries in backwards the 7805 regulator is only ~60% efficient, but it'll do. Just relize it won't get as good battery life compared to a more complicated IC and schematic.

Select as Best AnswerUndo Best Answer

user
lukas011 (author)guyfrom7up2008-06-10

thanks with the resistor for the led and the 1n4001! so for the 7805, could you use a switching regulator circuit and would the difference in battery life for a linear and switching regulator be high enough, so that it is useful?

Select as Best AnswerUndo Best Answer

user
guyfrom7up (author)lukas0112008-06-10

well, let's just put it this way: for a 7805 you need very little external components, and it gets ~60% efficiency (you use 60% of the battery's energy before it dies). A bit more than half of the energy get's converted into regulated 5 volts, and 40% get's converted into heat. for a fancy switching buck ic it has maybe 10 external components, but it gets somewhere between 90 and 98% efficiency, as in almost all of the power is being turned into regulated 5 volts, and very very little into heat.

Select as Best AnswerUndo Best Answer

user
Brennn10 (author)2008-06-10