Head-Fi.org › Forums › Misc.-Category Forums › DIY (Do-It-Yourself) Discussions › The Apple diyMod: My Take on the Famous iMod [56k killer] Featuring 3G, 4G, 5G and nano 1G!
New Posts  All Forums:Forum Nav:

The Apple diyMod: My Take on the Famous iMod [56k killer] Featuring 3G, 4G, 5G and nano 1G! - Page 120

post #1786 of 2490
amplifier valve kits, HIFI pre-amplifiers, speaker kits, upgrade components has Elna Cerafine and Slimic II's and still has the originally recommended Black Gate NX-HQ's, no MUSE fine gold's though. p&p is £3.21 for small orders and they have always sent my orders quickly.

Hope that helps

Gear mentioned in this thread:

Apple 30 GB iPod with Video Playback Black (5th Generation)
iPod Nano Headset Music Player
Apple iPod classic 160 GB Black (6th Generation) OLD MODEL
post #1787 of 2490
Thread Starter 
parts conneXion is having a 20% off sale on film capacitors, wires and cables until the end of March.

eConneXion March 2009 Newsletter

No, they aren't paying me to advertise, I just thought some of you might care to know. I'm not affiliated with them in any way.
post #1788 of 2490
Quote:
Originally Posted by suicidal_orange View Post
amplifier valve kits, HIFI pre-amplifiers, speaker kits, upgrade components has Elna Cerafine and Slimic II's and still has the originally recommended Black Gate NX-HQ's, no MUSE fine gold's though. p&p is £3.21 for small orders and they have always sent my orders quickly.

Hope that helps
Thanks for that. Unfortunately not in the sizes I want. He recons he will have then in a fortnight or so. Very helpful on the phone
post #1789 of 2490
anyone manage to get caps AND acharge/sync mini USB socket in the one LOD yet?? just spent the last couple of days trying to get it done. only way I can think to make it work is to have the 22uf BG hiQ not 47uf installed in a large mini like XLO or canare and then install the USB socket in the LOD connector. I tried twice unsuccessfully to fit both in the dock connector and all was well until I glued it shut. even though it was filled with epoxy and the wires were all insulated I figure the pins must've been pushed together (the only part not insulated but had plenty of epoxy on them) when I put it in the vice. I may never know what went wrong because I smashed the cable into little pieces. was all working great until I tested it after. I cant think of a way for me to find more room in the LOD except maybe using very thin wires for the audio connections. as it was I was using 22AWG jena and 20AWG cryo silver and 34AWG SPC for the USB was quite neatly done although it looks a little ghetto because of all the epoxy I had to use and I actually thought i'd done it the second time round (first time I used 18AWG jena instead of the 22AWG. and it too was very close. had to modify the inside to fit the caps in the corners near the cable exit so they didnt get pushed out towards the locking pins, rendering them useless. could maybe get it done with purely charge or sync, but not both; with both it means the whole front of the connector is off limits because you are using too many pins for there to be room to squueze even a 22uf in between like I do sometimes with a regular DIYMOD LOD. any idea I havent mentioned would be much appreciated
post #1790 of 2490
Thread Starter 
Pictures would be very helpful. =) There are plenty of things you can try.

- Use a larger dock connector. I don't know which one you're using, but if you use the one I always use, the one that snaps shut or Ridax model A or E, you'll have loads of room.



- If you used 28 AWG for all wires, I think you'd be okay. USB 2.0 specifies 28AWG for the data lines, and between 20AWG and 28AWG can be used for the power wires. If you use individual wires without the rubber sheathing, shielding and so on, I think you'll have more room to work with. To compromise for space sake, I think anything thicker than 24AWG for audio is pushing your luck.

- Use the same ground wire for audio and USB. They're all connected together on the logic board anyway, so exclude one wire from the dock. You eventually need to shield the USB wires, but I think it'd be okay if you omitted most of it within the dock connector; just make sure it's still connected to ground before it leaves the dock.

- Don't connect the USB shield. I know it goes against what I just said, but since it's already connected at the computer end, maybe it's not entirely necessary for you and it gives you extra room.

- Push the 22uF caps into the corners of the dock connector.

- Use 22uF instead of 47uF.

- Leave the hot glue and epoxy out unless absolutely necessary.

Those are some things you can try. I can't guarantee it'll work, but if it all works out inside my head, surely it's going to work out fine. Let us know how it goes.
post #1791 of 2490
Quote:
Originally Posted by joneeboi View Post
Pictures would be very helpful. =) There are plenty of things you can try.

- Use a larger dock connector. I don't know which one you're using, but if you use the one I always use, the one that snaps shut or Ridax model A or E, you'll have loads of room.
LOL yeah; loads of room hehe. yeah thats the one i'm using excuse the grubby glue fingers. this was obviosly before clean up.. epoxy is sooo messy. wish hotglue held and seal as well




actually just checked and its not 34AWg im using for the USB, I think its 30 and i've never had any problems using that before. never put on in a capped LOD before though; only in a VCAP or a regular LOD. not sure if youve done it before either judging by some of the language you used in your post. like 'hopefully'.

Quote:
- If you used 28 AWG for all wires, I think you'd be okay. USB 2.0 specifies 28AWG for the data lines, and between 20AWG and 28AWG can be used for the power wires. If you use individual wires without the rubber sheathing, shielding and so on, I think you'll have more room to work with. To compromise for space sake, I think anything thicker than 24AWG for audio is pushing your luck.
so it would seem; I was soooo close and I think I can do it with the 22uf either by squeezing it in or by putting the caps in the mini; but yeah If I used 24AWG all would heva been well, was that close, but unfortunately jena doesnt come in 24AWG. wish it did. will have to make a mundorf version and with a 3 wire braid no USB ground sounds like a winner

Quote:
- Use the same ground wire for audio and USB. They're all connected together on the logic board anyway, so exclude one wire from the dock. You eventually need to shield the USB wires, but I think it'd be okay if you omitted most of it within the dock connector; just make sure it's still connected to ground before it leaves the dock.-

Don't connect the USB shield. I know it goes against what I just said, but since it's already connected at the computer end, maybe it's not entirely necessary for you and it gives you extra room.
yeah never needed to use the shield in an LOD before. so are you saying I can omit the USB ground alltogether as long as the LOD is grounded??



Quote:
- Push the 22uF caps into the corners of the dock connector.
yeah thats what I did with the first LOD with the 22uf as they fit in the corners, the 47 dont really, but the first one I used 18AWG jena so it didnt fit, was sooo close though

Quote:
- Use 22uF instead of 47uF.
will do

Quote:
- Leave the hot glue and epoxy out unless absolutely necessary.
if it was for me I wouldnt bother with it, but as it isnt I feel better with it there.; but will keep to a minimum and apply just the once at the end when i'm sealing it up. this one I added it twice and I think that was the problem in the end. I added it once to seal off the pins on LOD and USB connector and then again when closing. so the wires couldnt really move and because I used epoxy instead of hot glue, I couldnt hit it with the hot air to soften it. I use epoxy as it seals the jena and stops the legendary discolouration cant have that

Quote:
Those are some things you can try. I can't guarantee it'll work, but if it all works out inside my head, surely it's going to work out fine. Let us know how it goes.
ahha so you havent done it?? it worked out in my head too i'll let you know how it goes for sure. wont be doing it until the 2uf get here; I ran out on the first LOD and oly had 47uf for this one. used all my 22uf last week on other stuff. tried a couple in gamma1... did nt like it. I dont thing BG are that great for builds like that; really good for their size, but if I have room I always use something else. people seem to be going BG crazy over on the gamma1 thread though. dont know what the fuss is about personally
post #1792 of 2490
Thread Starter 
I didn't know you were using a mini-USB jack. That certainly changes things. I thought you were using a second cable coming out the back, so that changes a lot of what I said. And yes, I have never attempted such a dock.

It looks like you're quite close there. I think being wiser with the glue and epoxy will definitely help. Is it necessary to use both? I'm worried about height, whether or not the dock will snap shut for you. I think grounding will still be a funny issue though. If you could reduce the number of wires, that would certainly help. Maybe solder your audio ground wire to the body of the USB jack and then solder from the jack to any of the ground pins. Something I've never tried before but you can try is soldering to the metal clips that lock the dock into the iPod. The dock is grounded, so you'll still be connecting to ground if you solder your wires to the clips. That'll save the wires from entering the pin area, saving you a bit more room. You'd definitely have to be creative with it though, and who knows if that's a reliable place to solder ground to.

Also, I wonder about the positioning of the capacitor on the USB side. Maybe you can orient it so the capacitor leads are facing perpendicular to the dock pins like the capacitor on the audio side.

I'd say your biggest problem is the glue and epoxy overload. Use it sparingly, and you'll probably get a lot closer next time.
post #1793 of 2490
Guys, this may seem like a silly question but I've been looking for a number of hours and was wondering how the uF rating of a capacitor changes the sound? Does it alter impedance? Also when doing the DIYMod, does it matter what voltage the capacitors are?

Thanks guys, I'd really appreciate your help on this one - got my 80g 5.5g rocking up this week and would like to get it set up with my fiio e5 (temporary) as soon as possible!
post #1794 of 2490
Thread Starter 
The diyMod capacitor forms a low-pass filter with the input impedance of your amplifier, and the higher the capacitance, the more bass information you get (or the less bass you lose, whichever way you want to look at it). The equation that prescribes this behaviour is represented as,

f = 1/(2*pi*R*C)

where
f is the -3db frequency, or the corner frequency, which tells you the lowest audible frequency allowed by the filter,
R is the input impedance of the amplifier, and
C is the capacitance of the diymod capacitor.

You can see that by raising C and keeping R constant, meaning that you use the same amplifier, the corner frequency, f, is lowered and the filter lets through more low frequency signals.

As for voltage, for the most part, you don't have to worry about it. There is only about 2VDC coming from the Wolfson, so there isn't much you have to worry about in terms of voltage rating. Some capacitors are rated for 2VDC, but they're usually surface mount capacitors that you don't need to worry about. That's a slightly longer answer than you need, but it's what I'm giving you.
post #1795 of 2490
Quote:
Originally Posted by joneeboi View Post
I didn't know you were using a mini-USB jack. That certainly changes things. I thought you were using a second cable coming out the back, so that changes a lot of what I said. And yes, I have never attempted such a dock.

It looks like you're quite close there. I think being wiser with the glue and epoxy will definitely help. Is it necessary to use both? I'm worried about height, whether or not the dock will snap shut for you. I think grounding will still be a funny issue though. If you could reduce the number of wires, that would certainly help. Maybe solder your audio ground wire to the body of the USB jack and then solder from the jack to any of the ground pins. Something I've never tried before but you can try is soldering to the metal clips that lock the dock into the iPod. The dock is grounded, so you'll still be connecting to ground if you solder your wires to the clips. That'll save the wires from entering the pin area, saving you a bit more room. You'd definitely have to be creative with it though, and who knows if that's a reliable place to solder ground to.

Also, I wonder about the positioning of the capacitor on the USB side. Maybe you can orient it so the capacitor leads are facing perpendicular to the dock pins like the capacitor on the audio side.

I'd say your biggest problem is the glue and epoxy overload. Use it sparingly, and you'll probably get a lot closer next time.
22uf + less epoxy = win!!

didnt actually think about the fact that I wouldnt actually need much in the way of epoxy for strain relief (juts a dab initially to seal th jena and pins in place and a tiny bit to keep th dock shut) the dock is jammed enough that the friction alone will stp anything from moving in there as long as its shut. BTW glue and epoxy in my wording before were interchangable. I didnt use hot glue as well, just epoxy. either way it works, will have to put together a tutorial next time
post #1796 of 2490
Thread Starter 
Where are the pictures?!
post #1797 of 2490
Quote:
Originally Posted by joneeboi View Post
Where are the pictures?!
tomorrow, its 3.30am here in OZ last time I woke everyone up turning lights on to try pics I got yelled at by my flatmate
post #1798 of 2490
Quote:
Originally Posted by qusp View Post
tomorrow, its 3.30am here in OZ last time I woke everyone up turning lights on to try pics I got yelled at by my flatmate
Wait, isn't it already tomorrow in Oz?

So where are those pics? Are you still asleep?!?! Wake up slacker!

j/k I'm looking forward to seeing your result. I've wanted to build this same concept for awhile now. I want an LOD with bypass caps inside and a mini USB for charging. Being able to access it on the PC would be nice, but mostly I need charging for in the car.
post #1799 of 2490
Quote:
Originally Posted by joneeboi View Post
The diyMod capacitor forms a low-pass filter with the input impedance of your amplifier, and the higher the capacitance, the more bass information you get (or the less bass you lose, whichever way you want to look at it). The equation that prescribes this behaviour is represented as,

f = 1/(2*pi*R*C)

where
f is the -3db frequency, or the corner frequency, which tells you the lowest audible frequency allowed by the filter,
R is the input impedance of the amplifier, and
C is the capacitance of the diymod capacitor.

You can see that by raising C and keeping R constant, meaning that you use the same amplifier, the corner frequency, f, is lowered and the filter lets through more low frequency signals.

As for voltage, for the most part, you don't have to worry about it. There is only about 2VDC coming from the Wolfson, so there isn't much you have to worry about in terms of voltage rating. Some capacitors are rated for 2VDC, but they're usually surface mount capacitors that you don't need to worry about. That's a slightly longer answer than you need, but it's what I'm giving you.
no thats perfect - excellent food for thought. Thanks so much for your help!
post #1800 of 2490
Finally got my act together and tried to do the mod... would anybody be able to hazard a guess as to why the sound on the right is very very soft? There's sound, as long as I pump up the volume I can hear it... would it be my dock or the diymod, or how should I go about testing it?
New Posts  All Forums:Forum Nav:
  Return Home

Gear mentioned in this thread:

Apple 30 GB iPod with Video Playback Black (5th Generation)
iPod Nano Headset Music Player
Apple iPod classic 160 GB Black (6th Generation) OLD MODEL
Head-Fi.org › Forums › Misc.-Category Forums › DIY (Do-It-Yourself) Discussions › The Apple diyMod: My Take on the Famous iMod [56k killer] Featuring 3G, 4G, 5G and nano 1G!