i want the total circuit design.. and the working of it ..
Simply putAn ipod charger can be made with 4aa batteries in series with a 7805 (or equivalent) voltage regulator to take it down to 5 volts. A diode would also be good in that so the ipod will not do anything unexpected. Diodes drop the voltage about .7v, so you could theoretically just run 4aa's and a diode and get 5.3v. I believe USB voltage is 4.75-5.25v, so you would not be going over the limit too much.A current limiting resistor could be used to keep the current draw under 1amp (current given by an apple sold charger. 500ma is typical powered usb voltage) i have not tested this out/nor do i know anything really about current limiting resistors.You could also go the hard way and make a voltage/increasing device such as mintyboost. Run times are shorter for these becasue they draw a lot of current, but more convenient, as they usually require less batterys (mintyboost uses 2 AA batterys) You can also use rechargeable batteries, but it may cut out prematurely becasue rechargeable are usually rated 1.2v, as a=opposed to alkalines (and other type) 1.5v. Your best bet with rechargeable is to use 5 in series. With the method for 4 above.You can also use different types of batterys. AAAs are more portable, but will run shorter. D sized batterys will run a lot longer, but will be more bulky. Theres other methods, such as adding solar power, or using a single 9 volt battery, but thats a whole other post.NOTE: I have not tried/tested any of these methods, but there have been a lot of successful stories. If you want more ideas, search how to make an ipod charger on instructables (or google).
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I forgot one small (not really) detail. You have to add a resistor between either Data - and data + on the usb, or data + data -, and v+Search google for usb pin layout.Also search google for correct resistor values, this resistor will make your ipod recognize it as a charger.
Forgot to add the voltage regulator in diagram. It goes after the diode. Make sure your diode is rated at lest 6v @ 1amp, if not more
and also not that the drawing an pins are not accurate on female usb.. srry about that