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Go Back   Head-Fi: Covering Headphones, Earphones and Portable Audio > Misc.-Category Forums > DIY (Do-It-Yourself) Discussions

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Old 01-26-2008, 06:46 AM   #791 (permalink)
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Originally Posted by joneeboi View Post
Check the datasheet on the Wolfson WM8971.
K...Thanks!

Hopefully I get this right....

Now for another one. I can run the wires to the LOD and the headphone jack coming off of the capacitors, correct?

As in:

Wolfson>BG capacitor> wires to dock and wires to headphone jack.

That's how I think it may work best...Am I correct?


I read the datasheet and found pin 4 and 19 are the digital and analogue grounds, respectively.

Now, before de-soldering the L and R connections near the chip, I put my DMM on either side of each resistor (I think that's what those are), and I get a reading (using the 200K setting on the DMM), and was getting reading's of 1,000-1,200 on either side of each. I'm thinking this may be because of them still connected that the readings aren't changing. But I don't know.

When I do take them off (tomorrow) and I get a reading of 0 on one of them, that would mean it's the GND correct?

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Old 01-26-2008, 03:09 PM   #792 (permalink)
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What you're looking for is continuity between the analogue out pins of the Wolfson and the resistors, R900 and R903. From the closeup image from ipodlinux, you probably want the south end of those resistor spots. And sending the signal to the headphone jack and the line out is a viable solution. It may not be the best necessarily, but as long as it serves your needs as closely as possible, it is the best solution.
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Old 01-26-2008, 03:30 PM   #793 (permalink)
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Originally Posted by joneeboi View Post
What you're looking for is continuity between the analogue out pins of the Wolfson and the resistors, R900 and R903. From the closeup image from ipodlinux, you probably want the south end of those resistor spots. And sending the signal to the headphone jack and the line out is a viable solution. It may not be the best necessarily, but as long as it serves your needs as closely as possible, it is the best solution.
Thank you!!!

I will be working on this tonight..at least the desoldering of the resistors..I'll post pics!

Waiting on the BG caps and needing to get some 30AWG wire....
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Old 01-26-2008, 03:31 PM   #794 (permalink)
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Default I know I'm going to regret this but....

Not to offend anyone, and this is just IMHO of course, but a DIYmod probably does not make a good first project of this sort. I'd expect one to be quite handy w/a soldering iron & have at least a couple builds of some kind under their belt before attempting this. At least maybe practice on a junker PCB w/SMD parts... Combing through this thread & that of similarly intricate projects shows what can go (horribly?) wrong.

Again, just an opinion & sure if one has a sacrificial ipod, or one already having issues, and wants a challenge/adventure - whatever. But if someone wants a DIYmod, has the resources but doesn't want the risk assoc w/doing one, there may be builders around willing to assist directly w/the work (other than myself at the moment
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Old 01-26-2008, 03:58 PM   #795 (permalink)
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I've actually replaced those copper wires in my photo with Silver/Gold alloys, I tore out one of the solder pads(L3) when I snapped it back because of the tight dimensions. Luckily those small circular unused pads with no apparent use on the iPod were there to save my life.

I can't wait to test it out again and see if there's any difference, I've accepted that my setup sucks, so there's no point testing them myself. But, I've actually heard a tiny difference(sounds richer) between headphone out and LOD with my BOSE speakers.
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Old 01-26-2008, 07:44 PM   #796 (permalink)
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guys, please...i need your opinion, i made lod for my DIYmod nano right now...i've made mini to mini interconnect + dock with female jack, here's the picts of it...





is it a good idea ? what i want is 1 dock for every cable that i need...i'll make another interconnect cables, like mini to RCA, mini to big jack and so on...
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Old 01-26-2008, 10:55 PM   #797 (permalink)
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here's the progress of the lod female jack...the body size of female jack are too big to place inside lod... i must think somethin else to make it more nice (to see)...





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Old 01-26-2008, 11:02 PM   #798 (permalink)
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Thats your choice iQEM. Some around may say that it is just more connections but it probably wont make that huge of a difference. I personally like to avoid doing that sort of thing if possible, but it really is up to you.
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Old 01-26-2008, 11:05 PM   #799 (permalink)
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iQEM: I think so, I mean, some may try use as little connections as possible, but I really dont think it would make a huge difference unless with a very revealing system. naturally, try keep things built well with decent wire and stuff, and you should be good. If I may make a recommendation though: placement and routing are very important. I think you should place the caps in a way that suit their physical environment, and bend their leads in perfect rout. maybe figure out the best placement, bend the leads to be in the perfect positions, glue the caps in place, everything should be solid for a good long time. also, use some heat shrink in there, it'll keep things neat and the shorts away. take a look here to see what I mean:
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Old 01-26-2008, 11:56 PM   #800 (permalink)
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looking good iQEM

it looks like a really tight fit with the BGs and female jack. Plus it looks like if you press hard on the jack it might disturb the BGs. You could just give up the idea of a completely internal female jack and go with one that is slightly external.

Like ipod connector -> BG -> wires -> very short external female jack/ This way you won't put pressure on the BGs. Just my opinion.
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