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The Apple diyMod: My Take on the Famous iMod [56k killer] Featuring 3G, 4G, 5G and nano 1G!
Apr 16, 2010 at 11:40 AM Post #2,161 of 3,220
I'm still having problems with my mod, The battery drains very quickly and I have also noticed that it does not charge via usb, but does when plugged into mains power. When charging via usb, the ipod recognises it and shows the charging symbol but does not actually charge the battery. I done some further research and stumbled across this thread, I believe I have the same problem, looks like the only solution If I want to continue to use rockbox is to buy a new logic board.

dreamlayers: Video iPod won't charge via USB, won't turn off from Rockbox
 
Apr 16, 2010 at 5:57 PM Post #2,162 of 3,220
Quote:

Originally Posted by het.s /img/forum/go_quote.gif
Don't agree, caps fit inside 5G, in my case together with 120GB drive. Some people put succesfully 240GB drive inside, that is quite a storage. Caps are lytics obviously (for size matters).<snip>
L_u_k_a_s


If you'd like to share some pictures, that would be very nice of you. I haven't seen it done yet, but if you have pictures, please share with the rest of us so we don't all have to get CF cards.
smily_headphones1.gif


Quote:

Originally Posted by tekdemon /img/forum/go_quote.gif
Also, if I ran the line out without caps into an amp, would it still damage headphones running off the amp? I'm just not clear as to why this would end up damaging headphones if the amp is running the signal through a whole bunch of caps.


Not every amp has AC-coupling or DC-blocking caps in them. Take the popular AMB Mini^3. It is fully DC coupled, meaning that having DC in your input signal will amplify the DC into your headphones. There are a bunch of caps in the circuit, but they all serve different purposes from DC-blocking. You will most certainly fry your headphones going straight from the diyMod into a DC-coupled amplifier.

Quote:

Originally Posted by Steph86 /img/forum/go_quote.gif
I'm still having problems with my mod, The battery drains very quickly and I have also noticed that it does not charge via usb, but does when plugged into mains power. When charging via usb, the ipod recognises it and shows the charging symbol but does not actually charge the battery. I done some further research and stumbled across this thread, I believe I have the same problem, looks like the only solution If I want to continue to use rockbox is to buy a new logic board.


Double check the soldering. Sounds like a short somewhere, but I really couldn't tell you where. Use a good magnifying glass and a good lamp. Blow pressurized air onto the PCB if you have to (just avoid destroying stuff).
 
Apr 17, 2010 at 8:25 PM Post #2,163 of 3,220
joneeboi, I was hesitant to open my iPod only for making pictures, but you asked for it so here they are. There is one capacitor in series, one resistor in series and second resistor shunt to ground (per channel).
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L_u_k_a_s

Quote:

Originally Posted by joneeboi /img/forum/go_quote.gif
If you'd like to share some pictures, that would be very nice of you. I haven't seen it done yet, but if you have pictures, please share with the rest of us so we don't all have to get CF cards.
smily_headphones1.gif










 
Apr 19, 2010 at 2:16 PM Post #2,165 of 3,220
thanks, now that you don't have to squeeze the caps inside LOD connector, you can put there (for portable use) opamp buffer circuit and use 3v or 3.3V directly from iPod (not tested).

anyone to design such circuit? maybe only one dual opamp and passive components, or one opamp for buffer and one opamp for virtual ground?

btw it's not so clean, I'd call it surgery, not modding. you have to cut and file off (white) front panel and the grey cage. just little to make room for wires to pass from the front to rear of pcb and then back.
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L_u_k_a_s

Quote:

Originally Posted by joneeboi /img/forum/go_quote.gif
That's very clean work, het.s! I like the use of heatshrink and tape. Very secure and nice. There is hope after all. I also like how you taped over the capacity on the back plate.


 
Apr 19, 2010 at 6:07 PM Post #2,166 of 3,220
We've talked about it a little in the thread and around the forum, but generally, I think it isn't worthwhile adding a buffer circuit into the LOD. The volume pot would be hard to pull off. The rest of the circuit would be fairly easy to implement, but getting a volume slider to work would be the toughest part. I think the output jack would have to hang outside of the LOD, but other than that, it shouldn't be impossible. You wouldn't really be getting a hi-fi signal per se, but it would be insanely portable. Battery life would be a big issue though. You could get a larger back plate and larger battery to make up for the extra current draw.
 
Apr 19, 2010 at 11:29 PM Post #2,167 of 3,220
My previous post was unclear: I ment to put buffer inside LOD which is then connected to standalone portabe amplifier. So it's more kind of line-level buffer than headphone buffer. I don't think that current drain is big issue, maybe you lower your mileage to 50 %.

I need amplification (factor of 2 may be sufficient) with modified iPod and Grado SR80 'phones (as well as with stock iPod). Of course the other way is that you can make an amplifier with buffer at the input.
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L_u_k_a_s
 
Apr 25, 2010 at 8:38 AM Post #2,170 of 3,220
no experience with mini. caps are tight fit in big iPod video. you might try some with smaller capacity (and physically smaller), if bass rollof is not a problem, let's say 0.47uF.
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L_u_k_a_s

Quote:

Originally Posted by marvelousmarvyd /img/forum/go_quote.gif
Het.S or anyone else who can comment, have you found a way by chance to fit caps in the mini also.


 
Apr 26, 2010 at 12:37 AM Post #2,172 of 3,220
Hi everyone, I'm new to all of this diyMod stuff, but I recently purchased a second hand, pre modded 5.5g off of eBay, which came with its own LOD, using Elna Silmic 4.7uf caps. I'm guessing the previous owner did it to fit the caps inside a slim connector. Currently using triple.fi's.

I'm finding that there is very little bass, and using my recently acquired iBasso T3, it doesn't get up to the sound levels that I would like (beyond halfway on the volume dial, it starts to get a large amount of hiss at any gain level. currently have it on +3db).

I'm not very good with all the capacitance, calculations and such, but I am a dab hand with a soldering iron. If I were to make a new LOD with some 47uf Blackgate capacitors, as per the original LOD for sale, would it make a difference to the sound level and bass?
 
Apr 26, 2010 at 6:12 AM Post #2,174 of 3,220
actually angel, if the t3 has a 10k pot there would be some bass rolloff starting around 33hz, but doesnt explain the grain, noise etc. perhaps there is some other issue, suppose it could be intermodulation distortion, though unlikely and sure doesnt explain the volume, though the t3 might as its really not a powerful amp at all
 
Apr 26, 2010 at 6:20 AM Post #2,175 of 3,220
with some of the new 0603 and 0805 size PPS film SMD caps, there is no reason not to put a few in parallel to get the right capacitance inside the ipod. better quality caps than blackgate electros too IMO
 
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