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So, after finally having the time to attempt to trouble shoot the my Mini...
I find that there is STILL a DC offset no matter what I do.
From the LOD its 30 mV and after my amp (yes, I know running DC through my amp is BAD), its ~ 15 mV
I'm pretty sure I'm doing this right (I get one channel sound, cleanish), but am just worried about the DC offset. Anyone have any idea what could be happening?
DC Line out= 1.5 V
Output Offset (after caps)= 30 mV
I know the Caps are supposed to kill DC offset.... but for some reason they aren't. Not sure why. Since I'm assuming the output from the line out is clean, something wrong in the Dock?
Pics are always helpful. Try rolling different caps into the DC blocking position to see if you just have some bad caps. What kind are you using? Did you melt the caps during the soldering process? My best guess would be just to get a different set of caps. If anything, 15mV is tolerable for headphones, so you're still pretty safe using your amp.
__________________
"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)
Bought the dock from Steven Kelby so I can't check the caps.
...
Interesting thing is that the output from the amp is actually reading only 12 mV... Might just be discharging issue?
Edit: Think it was discharging (was playing music to test if channels were correct). Seems like one is near dead on and the other is ~ 2 mV off (which was offset at the cap SMD pads). Looks good. :-D Thanks a lot guys!
poss silly question, but does the quality of the wire used to connect the DAC to the line out pins make any difference (re 2nd gen ipod mini if that matters).
Ive used standard hookup cable but have some nice shiny silver in cotton which sounds great in the line out DOC so just wondering if worth opening the mini again.....
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Home: Meridian 861v4, BelCanto REF1000's, Revel Studios, Voice, M12's, 2*B15a + roomtraps
Work: Sennheiser HD 600, Audiovalve RKV MkII
Road: Shure SE530, Iqube, Ipod Mini 32GB (Rockbox & FLAC)
Retired: Maudio X5L, Sony HD5, Ipod 20GB
If you're going to go with completely external caps, why not go for some different caps? If size isn't a factor, I don't think you need to stick with BGs. With the iPod 4G, the NX Hi-Q is almost the automatic choice for an internal mod because it balances SQ and size. In your case, the sky (and/or your wallet) is the limit.
Hi joneeboi,
yes, you're right. But I'm studying several ways to do the mod. The ultimate is BG caps inside the 5G ipod with internal jack. I need the BG caps to see if it is possible. Hard drive must be replaced by a CF. Be patient...
poss silly question, but does the quality of the wire used to connect the DAC to the line out pins make any difference (re 2nd gen ipod mini if that matters).
Ive used standard hookup cable but have some nice shiny silver in cotton which sounds great in the line out DOC so just wondering if worth opening the mini again.....
It's really up to you whether or not you want to use it. I could tell you that it makes a difference and someone could tell you otherwise. You could actually hear it or you could might be imagining it. That's all a polite way of saying that it makes so little difference that "hearing" cables and other rubbish like hearing silver solder, hearing dielectrics, hearing connector plugs is only in your head. Its only worth is to show off how much money you spent on such and such component because you apply only the highest standards to your rig and cannot suffer such measly, common parts as the peasants. Like Enzo Ferrari said, "Aerodynamics is for those who cannot build engines." Verily, to a point, a car's shape has some effect on its overall performance, but there is a point of diminishing returns where resources are better spent on other things. The not-so hidden message is that your money is more wisely invested on such components as amplifiers and headphones, power supplies and groceries, the investments whose effects are easily detectable.
Now, seeing that you already have the wire in your possession, you could very well swap it in. I just won't guarantee it'll make a difference, let alone an improvement. I don't mean to ramble, but I felt that at least a little context ought to be laid. I didn't believe that swapping between 22uF and 47uF caps could make such a big difference, but I could easily show you the change had I the appropriate ABX switching apparatus. If someone can show me the difference that cables make, sign me up for the newsletter (provided the cables don't cost an arm and a leg). I am open to the idea, but remain evermore skeptical. Alas, I fear the flaming arrows may come, so I will desist.
Originally Posted by gueri_fr
Hi joneeboi,
yes, you're right. But I'm studying several ways to do the mod. The ultimate is BG caps inside the 5G ipod with internal jack. I need the BG caps to see if it is possible. Hard drive must be replaced by a CF. Be patient...
gueri_fr
Even if the CF card doesn't give you more room and such, one possibility is to swap in a bigger back panel, ie. if you have a 30GB iPod, get a 60/80GB back panel. I know the CF card adapter for my 4G allows for way more space, but I haven't gotten around to buying the card yet (and probably won't for some time). Although it's not entirely compatible with your iPod, check out my size comparison in a dead 4G.
__________________
"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)
Even if the CF card doesn't give you more room and such, one possibility is to swap in a bigger back panel, ie. if you have a 30GB iPod, get a 60/80GB back panel. I know the CF card adapter for my 4G allows for way more space, but I haven't gotten around to buying the card yet (and probably won't for some time). Although it's not entirely compatible with your iPod, check out my size comparison in a dead 4G.
Hi!
I know but ipod 30gb with a 60/80gb back panel is not a challenge . I think (I hope) there is just enough room but the CF adapter need to be cut. I don't have all the items yet for the mod but I think it is not an impossible mission. To be continued...
I've just modded my Video gen5.
However, there is a problem with it
After modding, I let it run out of battery to test and charged it via USB. It showed the charging icon for a while and suddenly blacked out I've tried pressing buttons but it still can't turn on again.
DC OFFSET... :(
...
). Glad to hear it. Enjoy your diyMod!
