Quote:
Originally Posted by WindowsX
Ken, this won't make anything much better. iPod's lineout is a bit too weak for large caps especially in classic. If you want to make it sounds real better, give a dedicated power supply source and you'll know what's the difference between home CD player and portable batteried power player.
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Hi WindowsX,
The fact that the iPod runs on a small Li-Ion battery does not mean that the line-out stage "lacks power" compared to if you plug it into a power supply. Obviously, a larger battery will allow you to play longer between charges, and an external power supply allows you not to have to be concerned with charging, but the battery in the iPod can provide more than enough power to feed the dac chip. The dac chip only draws a few milliamps, so you don't need much power. Compared to the hard drive, LCD, and other ICs, the dac and output stage draws practically no power. The voltage to the dac is regulated and no matter if you use the internal battery or an external power adapter, that voltage is not going to change and the amount of current that the dac draws will also not change.
The caps on the output stage are only used the block dc. The audio signal flows past them just fine. So when you say the output is too weak for large caps, this is incorrect. There are no power issues... trust me
The only "power issue" with the battery is that you will at some point need to recharge it.
Best regards,
Vinnie