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

[bidoux]

Originally Posted by dumbears

2. mod the phone-out caps.
Then, it comes to mod the phone-out caps by replacing the original 100uF caps to 220uF.

We don't see this part on the picture.
Could you make another photo please ?

[no_eye_dear]

Hi Guy's just wondering if anyone has used the mixer outs 3 & 4 on a 5G video or even if they are enabled?
I like using the DSP of the DAC for room correction at low volume but the voltage on the HP outs is only 1V and I bi-amp!
I have a buffer in there to help out but I would prefer the 1.5V of the line-outs but with DSP... Am I right that these are usable this way?

Any thoughts chaps?

TTFN

[dumbears]

Originally Posted by joneeboi

Congrats, dumbears. I find it interesting that you'd change the headphone coupling caps. I think that's a thread first. Thanks for sharing that with us. How has it affected the headphone out signal?

Theoretically, the bass roll-off should be minimized on those low-ohm headphones by the well-known formula 1/(2*pi*R*C). However, I can't hear any differences between the unmodded and modded ones. I have 3 1st Gen iPod Mini's, so I still can make comparison among them. Perhaps, my UM2 aren't run-in yet. Moreover, I bet switching to BG may better serve this case. I'm using tant caps, which should be avoided, according to many of you. I wish I can find enough space inside the chassis of the iPod Mini.

Originally Posted by bidoux

We don't see this part on the picture.
Could you make another photo please ?

See this then. The caps are next to the WM8731.

[bidoux]

Thank you Dumbears. Will I have to replace both of them ?
Does the sound still go out through the headphone jack ?
Is the modification for Line Out or for the headphone jack ?

[dumbears]

Originally Posted by bidoux

Thank you Dumbears. Will I have to replace both of them ?
Does the sound still go out through the headphone jack ?
Is the modification for Line Out or for the headphone jack ?

Yes, you've to replace both, one for the left and the other for the right. The sound will still go out thru headphone jack. Only if you don't mind losing a few US dollars and time, it's risk-free to do the swapping. You should've some experience in soldering though.

To your last question, this is only to mod the phone-out. The line-out modding is comparatively more difficult to work out.

Hope the above info helps.

[Hayduke]

dumbears,

You don't notice any change after replacing the caps? I had the same idea, but some folks here didn't think it would make a difference. I keep meaning to do it anyway, but I haven't touched my soldering iron for weeks now Too damn busy lately.

If it worked on the Mini I was planning to do it to my Video as well when I finally decide to open it and mod it.

[bidoux]

Thank you a lot dumbears i will probably try this. A last question, do you think the sound through a line out is different from the sound through the line out with this DIY mod ?
Sorrry for the English.

[joneeboi]

Hey, I think we've stumbled upon a new chapter of the diyMod where people will start replacing their HP out caps. Sweet. Now we can investigate audiophile SMD caps. Thanks for getting the ball rolling, dumbears.

*crosses fingers and hopes he's not getting ahead of himself*

[dumbears]

Here is an interesting article from Wolfson on AC coupling capacitor selection, which shared by bichi: http://www.wolfsonmicro.com/uploads/...en/WAN0176.pdf.

BTW, these are the caps used: KEMET 220uF/4V +/-20% CASE B T520B227M004ATE045. Of course, there're another AVX caps 220uF/2.5V +/-10% CASE B installed over in my another iPod Mini. Don't ask me for the differences, just read my name. :-P I hope I can get my ears trained up one day.

[no_eye_dear]

I modded my HP out some time ago so that I could still use the ipod's volume control and DSP for room correction but I basically took the signal straight off the DAC using the DC coupled configuration.
This is what makes me wonder about the OUT3&4 pins... If I could do the same with those outputs I would have the full 1.5V or even more... there is a boost option in the DAC .... but I'm not going to go reprogramming that!! Way beyond my abilities or understanding