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If you're not going to use the BG NQ 47uF cap, you don't have to use a 47uF cap. Anything down to 1uF will work, though lower values I'm not sure of. The BG NX 47uF was chosen for its ~high quality and small size, but you don't have to use it. It's convenient because it fits inside some iPod casings, but beyond that, you have a very wide choice of compatible caps besides the BGs.
Capacitance should depend on your source input impedance (most likely 10K for portable and 50K for home amp). You will have bass roll-off if you pick a cap too small.
The RC filter formula is : f = 1/(2 * π * R * C)
At a minimum go with 0.47uF+ for a 50K Home Amp (1uF will be better but I don't think you can actually tell the difference. For portable amps, grab something 2uF+ (4.7uF is best).
I have a pair of BG caps in there, but after switching to quality film caps in my AlienDAC, the BG's are nowhere nearly as good as AuriCap or Mundorf MCap ZN, only take them if size is a concern.
That sounds interesting, Fallen. Perhaps I will give my Vitamin Qs a run with the diyMod. I'm pretty sure my BGs are already burned in, and I can't tell the difference from before. I think I've listened to it enough to get used to the sound, so I'll post my impressions of the A-B whenever I get around to it. Don't count on it being anytime soon. Thanks for mentioning that.
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"Ears that hear and eyes that see - the LORD has made them both." Proverbs 20:12
Team University-fi | Team Edmonton-and-Surrounding-Urbanities(1)(2)
I love how slick the caps fits into the 4G ipods...makes me want to get one I do have another 5.5G i'll be modding soon(80GB), so I'll post back to let you know how that goes.
Just a little tip for 4th gen click ipod mode.
If you sending signal from DAC chip (pins 15,16) to the phone jack directly and want to save the hold function by keeping the ribbon cable you need to cut the signal that coming from main board through ribbon cable.
When I took off c84, 86 caps I still could hear music coming from the jack but with lots off noise at normal to high listening levels. After I cut signal traces on picture below (two yellow dots near ribbon cable plug), my ipod went dead silent.
Great work, ferds! That's as clean a build as they'll come. Congrats on the good work.
I recently got my hands on a black 80GB iPod video, and man, that thing was beautiful. In theory, the 5G/5.5G iPods are my favourite iPods and portable digital media players (the digital distinction made because there have been portable analog media players). I haven't owned an iPod video yet, but it seems lovely. Right now, I'm just chugging along with the 3G and 4G. The nano 1G and the 5G/5.5G video are my champions for now, but we'll see if someone can show me a better player.
Also, thanks for looking into where to cut the traces, vvs_75. Your way is much simpler than what I was imagining, so kudos on finding a darn-near perfect solution to that problem.
__________________
"Ears that hear and eyes that see - the LORD has made them both." Proverbs 20:12
Team University-fi | Team Edmonton-and-Surrounding-Urbanities(1)(2)
i'm planning on getting one to mod after I sell my nano
Will do! I already did a 5.5 (30GB), but the friend that let me borrow it wants it back!!!! He has no clue what he's got. Anyways, the other one is on its way.
I do have another 5.5G i'll be modding soon(80GB), so I'll post back to let you know how that goes.
He has no clue what he's got. Anyways, the other one is on its way.