Re: Lossless SD digital Player is computer audio now reborn?
Posted: Sat Mar 26, 2016 5:54 pm
Mine arrived late this week. After looking it over, I'll do pretty much the same mods as you did, Nige. First tho, I'll compare it stock to the SDTrans using the same supply, then upgrade the clocks and try it again. THEN I'll go to battery power.
I've already got some good NDK 22/24 clocks here and have located the 32kHz in the same series. Now I need to look for a good 8mHz clock... hopefully I can get it in the same NDK series.
I also found the cable to the screen and switches at Mouser and will order a couple of 4" ones. I plan to try powering the screen separately too, so I can cut the appropriate lines to provide the feed.
This is all down on my priority list, don't expect much on this before May or so.
EDIT: A couple more questions/comments on the EBAY SD Card Player....
Nige, does this thing actually take the stock power feed first through an 8v regulator, then through a 5v one before sending it through two 3.3v regulators, one for the processing and display side, the other for the audio signal generation and output? Seems like a lazy and probably not to effective of a way to do it, but then I am not an EE.
Nige, also, in the pictures, it looks like you still have the AC power input hooked up. Do you still need this even with the battery power feeds for some reason I haven't seen yet or have you just not taken the time to remove those yet?
Greg in Mississippi
I've already got some good NDK 22/24 clocks here and have located the 32kHz in the same series. Now I need to look for a good 8mHz clock... hopefully I can get it in the same NDK series.
I also found the cable to the screen and switches at Mouser and will order a couple of 4" ones. I plan to try powering the screen separately too, so I can cut the appropriate lines to provide the feed.
This is all down on my priority list, don't expect much on this before May or so.
EDIT: A couple more questions/comments on the EBAY SD Card Player....
Nige, does this thing actually take the stock power feed first through an 8v regulator, then through a 5v one before sending it through two 3.3v regulators, one for the processing and display side, the other for the audio signal generation and output? Seems like a lazy and probably not to effective of a way to do it, but then I am not an EE.
Nige, also, in the pictures, it looks like you still have the AC power input hooked up. Do you still need this even with the battery power feeds for some reason I haven't seen yet or have you just not taken the time to remove those yet?
Greg in Mississippi