The Apple diyMod: My Take on the Famous iMod [56k killer] Featuring 3G, 4G, 5G and nano 1G! - Page 78

Before I give you the values you want, I'll offer two contextual responses. First, you ought to always listen for yourself what value you want in your diyMod. That's the final test and greatest advantage of DIY; people can say what they want about brands, values, bypassing, whatever, but only you hear what you hear. Second and less interestingly, it depends on what is being paired with what. If it's an amp, if it's a set of headphones, this choice has an adverse effect on the size of your capacitor (say, 4.7uF vs. 470uF). If it's a 3G with such and such an amp, if it's a nano 1G with this or that brand of cap, things change. Ultimately, there's no guarantee that what anyone says here will be your experience, so you're going to have to find out for yourself. What everyone here likes may not be what you like. That having been said, people have used values from 0.1uF to 47uF for headphone amps. I have stated over and again that I love the BG NX Hi-Q 47uF 6.3V capacitor for my diyMod 4G and PIMETA with AD8620/AD8610 set at gain ~4 on my rescreened Grado SR60s with glue-modded Jumbo pads, Canare Starquad recable, and Dynamat driver mod with files encoded as 320kbps MP3 played through the original Apple firmware. You need to have a holistic view of your music, and again, what works for your ear may not work with mine.

Short answer is "maybe."

The only difference is a digital volume control, but I don't know if you'll be able to tell the sound difference between the two. See the datasheet block diagram (page 1) for more details.

darkfury18:

Apologies, I didn't know you were referring to the iPod 3G. I can't speak of low- or high-quality sound coming from either one, but the datasheet states that the headphone outputs are optimized for a 16 Ohm to 32 Ohm load. This detail means that if one is hooking up a headphone amp with, say, 10 kOhm input impedance, I don't believe the DAC would be performing at its best. It looks like it's a simple inverting amplifier that we're looking at, but again, the datasheet specifies 16 Ohms to 32 Ohms for the headphone outputs. Stick with the line out.

pkjames:

Absolutely, as long as you don't irrevocably destroy anything along the way.

Pics are always helpful.

barqy:

Are you accessing the DAC through the dock or through the headphone jack? I don't understand why you needed to ground anything unless you used some kind of external jack like I did on my first mod. Whether you go through the headphone jack or the dock, you never need to add your own ground wire. That could be the source of the problem.

edit: You might want to disconnect the wires and see if the voltages between the ground wires are indeed the same. If they aren't, there probably is current flowing from one to the other that is causing the battery to run out of power.

Lil' Knight:

I think we're going to need a bit more clarification to be of any use.

That's part of what I'm saying. The other part of the message was that you should remove the wire. It's unnecessary.