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The Apple diyMod: My Take on the Famous iMod [56k killer] Featuring 3G, 4G, 5G and nano 1G! - Page 27

post #391 of 3033
Quote:
Originally Posted by joneeboi View Post
vvs_75:

Sounds good, dude. What configuration did you go with? What's your take on CAvanessia's dock situation?
Is he triying to find traces to the dock pins?




Ok here we go.

My long term goal is to squeeze from ipod best sound possible for DIYer. Since I think that all DAC chips used in ipod very close in terms of SQ if not the same. I finally decided stop my choice on 1gen 4GB nano player. Small, flash memory player with color screen that all I need at this point. Since we must use output coupling capacitors, the only way is to get best sounding capasitors. There is no best! By best I mean sound that I am looking for and will sound best to my likening.

So I read impressions and reviews about V-Cap dock and since RWA using it made me think that V-Cap OIMP oil capacitor – best that you can find.

After reading impression like that:
http://www.head-fi.org/forums/3418284-post25.html

I decided that V-Cap cap is way go. So I start looking for the best-lowest price I could find on these caps. And to my frustration I found that there is only one place you can buy them.
Along the road I found few tech articles with explanations why film caps better than any electrolytic for this application and to my luck I also stumble on this nice review that change my mind about V-Cap cap.

Capacitors: Sonicap vs. V-Cap OIMP vs. Multicap Vs. Mundorf on 10 Audio


According to the review, from those they were testing the best sounding capacitor goes:

1. Mundorf silver\oil - 4.7mF cost around $70
2. Sonicap Gen I - 4.7mF $11
3. V-Cap OIMP oil - 4.7mF $80

Since DIY always about best bang for the buck my choice was obvious - number 2!



Parts:

1.Sonicap Gen I - 4.7mF $11 Sonicaps

2. Piece of 0.75mm cooper laminated board (bought on Ebay)

3. Enclosure - Mouser part # 546-1455C1201 $11

(1455C1201)

This is 120mm case which I cut to 90mm to mach length with my nano and mini3.
I think a lot easier to buy 80mm one. It slightly shorter than 1gen Nano. Mouser part # 546-1455C802BK – it’s a black one they out on clear cases.

(1455C802BK)

The enclosure comes with aluminum ends made from the same material. I drilled wrong hole so I ended up using my custom SS plates.

4. Phone jack (really nice jack made in Japan) - Mouser part # 161-7300-EX $0.87 (161-7300-EX)






Then I raped the caps in electric tape and cut the PCB to fit the caps






Next I drilled holes in the case back and caps enclosure.
















Analog Ground (blue wire) I took from phone jack. It’s most convenient place plus the biggest pad I could find.














I decided to make new super-duper separate dock. :-)
Meanwhile I reworked my ipod.

Two 47mF BG bypassed with 0.047 Auricap then 100 ohm RIKEN in series with 100k Riken to AGND for each channel.





post #392 of 3033
HOLY MOLY! Good job, VVS! Jon has a rocketpack. Yours is like a rocketship. LOL
post #393 of 3033
vvs, bro, WOW!!! You really took the diy to a whole new level! That looks amazing! It probably sounds better than it looks! Man nice job, great customization!
post #394 of 3033
I guess I come with good news too.

I think I found the inductors where the L/R line-outs are located. With joneeboi's advice, I tapped the spots where I think L/R are with two wires. The other ends are soldered to a 3.5mm plug, grounded at the headphone ground. In theory, if these are the L/R original line-outs then I should hear music from just these two wires. I turned on the iPod and plugged in my amp. I hear music!

So the next step for me is to desolder the C53/C54 caps, the inductors in my photo, and bridge the two spots matching up the channels.

However, from my last photo, I also found another spot with 0-ohms per channel. These are even smaller parts with the yellow and magenta colors. Should these be de-soldered too? It looks as if there is a faint trace from the inductors to these small parts then after these parts they go to the dock.



post #395 of 3033
Quote:
Originally Posted by CAvanessia View Post
I guess I come with good news too.

I think I found the inductors where the L/R line-outs are located. With joneeboi's advice, I tapped the spots where I think L/R are with two wires. The other ends are soldered to a 3.5mm plug, grounded at the headphone ground. In theory, if these are the L/R original line-outs then I should hear music from just these two wires. I turned on the iPod and plugged in my amp. I hear music!

So the next step for me is to desolder the C53/C54 caps, the inductors in my photo, and bridge the two spots matching up the channels.

However, from my last photo, I also found another spot with 0-ohms per channel. These are even smaller parts with the yellow and magenta colors. Should these be de-soldered too? It looks as if there is a faint trace from the inductors to these small parts then after these parts they go to the dock.


You see, in your signal path you still have tiny traces. Why not just solder wires to the dock line out pins directly?
post #396 of 3033
what an monsterous idea, Vvs...DIYmod nano with vcap, huh ? and an DIYamp too ? btw nice cans you got there, Ed9...
post #397 of 3033
Quote:
Originally Posted by vvs_75 View Post
Why not just solder wires to the dock line out pins directly?
because they're tiny.. and not worth the effort. its like working really really hard to get something better, and you're never going to use the old thing anyway, so why not?. I did it cause I needed the challenge.. in retrospect, I should have spent more time studying


iQEM: I added pin 29, which is the line out ground.

and kudos on the dock job vvs, really neatly done! pity you hadn't found those pins before though, you could have used either an imod dock to maintain portability, or a normal dock to hookup to your new monster. I'm sure it sounds great though!
post #398 of 3033
Quote:
Originally Posted by ruZZ.il View Post
kudos on the dock job vvs, really neatly done! pity you hadn't found those pins before though, you could have used either an imod dock to maintain portability, or a normal dock to hookup to your new monster. I'm sure it sounds great though!
Thanks! I know that the way through the dock connector better. I simply don't use ipod alone. But the biggest issue for me that I hate docks connectors! You just can listen music while charging your ipod.
post #399 of 3033
Thread Starter 
Quote:
Originally Posted by CAvanessia View Post
However, from my last photo, I also found another spot with 0-ohms per channel. These are even smaller parts with the yellow and magenta colors. Should these be de-soldered too? It looks as if there is a faint trace from the inductors to these small parts then after these parts they go to the dock.
Now that you mention it, that actually makes sense to get rid of those tiny caps. They form a low pass filter if memory servers, so you should get rid of them. Thanks for pointing that out.

Announcement: Get rid of the stuff between the inductors and pins!

As for you vvs_75, you beat me to the punch. I was going to do the exact same thing with my Vitamin Qs but they haven't arrived yet! Props on the dock though. What kind of amp are you going to be using with your diyMod nano? I imagine the portability is reduced with the amp unless it's something like a Mini^3.
post #400 of 3033
Quote:
Originally Posted by joneeboi View Post

As for you vvs_75, you beat me to the punch. I was going to do the exact same thing with my Vitamin Qs but they haven't arrived yet! Props on the dock though. What kind of amp are you going to be using with your diyMod nano? I imagine the portability is reduced with the amp unless it's something like a Mini^3.
Yes it’s Mini^3, you can see it in my last picture.
post #401 of 3033
Quote:
Originally Posted by joneeboi View Post
Now that you mention it, that actually makes sense to get rid of those tiny caps. They form a low pass filter if memory servers, so you should get rid of them. Thanks for pointing that out.

Announcement: Get rid of the stuff between the inductors and pins!

As for you vvs_75, you beat me to the punch. I was going to do the exact same thing with my Vitamin Qs but they haven't arrived yet! Props on the dock though. What kind of amp are you going to be using with your diyMod nano? I imagine the portability is reduced with the amp unless it's something like a Mini^3.
I will get on that when I get back tonight. I have a fundamental question about our methodology, though.

If I remove the C53/C54 caps, does that mean the original line-out signals
don't work from the 3-4 pins anymore (assuming nothing else is changed)? I'm asking because I want to be sure that the sound coming out of the dock AFTER C53/C54 have been removed is the DAC signal that we tapped - not the original line out.

If this is true, then soldering a wire from the C53/C54 pads to where the inductors are make perfect sense. We are skipping most of the small traces and low quality parts all the way to close to the dock connectors.

We basically only have one path for the DAC signals. Am I interpreting this right? Or do we have two simultaneous signals even with the C53/C54 caps off? One from our wires and one from the traces to the dock?

Stay tuned for photos =)
post #402 of 3033
Thread Starter 
There are two simultaneous signals, but not the ones you're thinking of. They come from the click wheel-controlled headphone jack output and the diyMod path. Even so, there are the caps between the inductors and the pins that affect the signal quality. I saw them in the 5G and the 4G but didn't think much of them.

Looking for foward to the pictures.
post #403 of 3033
That's crazy work vvs... By the way, after a night of burn in, and some probable improvement. Headphone out and my LOD is still giving very very similar sound, which is very clean, the slight diff may be because I'm using an external amp.
post #404 of 3033
Quote:
Originally Posted by joneeboi View Post
There are two simultaneous signals, but not the ones you're thinking of. They come from the click wheel-controlled headphone jack output and the diyMod path. Even so, there are the caps between the inductors and the pins that affect the signal quality. I saw them in the 5G and the 4G but didn't think much of them.

Looking for foward to the pictures.
Jon, if I use the dock line out, and removed the caps and inductors as shown in the previous pics, I should have no mixed signals right???
post #405 of 3033
Thread Starter 
Correct.
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