Computer Audio Blasphemy, nige tries Another SD Card Player

[jkeny]

These cards are being claimed to be the same sound quality as Panasonic SLC cards
https://www.amazon.com/Industrial-Micro ... SLC%2C+8GB

[jkeny]

Just to progress this somewhat - how about doing a group effort to trace the STM pins & develop the schematic for this board?

There are 4 sides to the STM chip & 4 of us could take one side each & trace where the pins of that side connect to
Anyone with one of these SD card players want to volunteer to trace a side?

I'll do the side at the top of the photo - the one nearest the I2S out pins

[seeteeyou]

Those cards from MIT TECH might only be sold as 10-pack so most likely they could be ignored

http://www.mittechgroup.com/flash-memory---storage.html

Fortunately we could also get Panasonic pSLC cards easily and they're starting at 20 bucks or so

https://na.industrial.panasonic.com/wha ... mory-cards
https://www.ttiinc.com/content/ttiinc/e ... -SMPT04DA1
https://www.ttiinc.com/content/ttiinc/e ... -SMPT08DA1
https://www.ttiinc.com/content/ttiinc/e ... -SMPT16DA1
https://www.ttiinc.com/content/ttiinc/e ... -SMPT32DA1

They also have something else called SLC-Lite for less than $20

https://na.industrial.panasonic.com/pro ... ite/CS4097
https://www.digikey.com/product-detail/ ... ND/5119431
https://www.mouser.com/ProductDetail/Pa ... 5XGg%3D%3D

Three-way shootout among those cards from Panasonic should be mighty interesting.

[Fran]

I'll take the next side around John - underneath where it says "ARM" in the image above.

I got my flashair card yesterday, and after some figuring out (I can't believe how poor the interface is on this from the company) I have it working for transferring files over tonight. So as proof of concept, it works. Files are fairly fast over the wifi here, and very fast when the files are in the slot on the laptop. Unfortunately, I have some bug in my system here - I can't get it to play anything with a bit rate over 16. It will play both sample rate families so I don't think its the clocks. And it played hi res fine off Nigels card in Tonys. This has yet to be investigated!!

[Fran]

Minor rant - it seems that it would be very easy to get cards that "seem" to be SLC but actually are not. Having had a quick look through a few sites, there are lots of cards which initially say SLC, but when you go to the datasheet, they aren't or they say something like SLC with aMLC technology or some other BS.

Grrrr.

[jkeny]

I'll take the next side around John - underneath where it says "ARM" in the image above.

I got my flashair card yesterday, and after some figuring out (I can't believe how poor the interface is on this from the company) I have it working for transferring files over tonight. So as proof of concept, it works. Files are fairly fast over the wifi here, and very fast when the files are in the slot on the laptop. Unfortunately, I have some bug in my system here - I can't get it to play anything with a bit rate over 16. It will play both sample rate families so I don't think its the clocks. And it played hi res fine off Nigels card in Tonys. This has yet to be investigated!!

Cool, Fran - we'll put it all together from each person's mapped connections

Best to use these chip pinouts for this 144 pin STMF407 chip - diagram from the datasheet
Note: pin 1 is marked with the dot on the chip so the corner nearest the SD card - so you are mapping pin 1 to pin 36 - I'm mapping pin 104 to 144

STMF407.jpg (111.11 KiB) Viewed 1018 times

[nige2000]

ill do 37 to 72
will be a few days though, things fairly busy atm

[jkeny]

ill do 37 to 72
will be a few days though, things fairly busy atm

Great, no rush on this

[tims]

Would these Intel 64GB 2.5" drives (some listings below) be a cheap SLC option to use with this project? They now sell typically in the $30 to $50 range. Also available in 32GB.
https://www.ebay.com/itm/Intel-SSD-SSDS ... 33e875124c

https://www.ebay.com/itm/Intel-X25-E-SS ... SwbmFanbqu

[jkeny]

Would these Intel 64GB 2.5" drives (some listings below) be a cheap SLC option to use with this project? They now sell typically in the $30 to $50 range. Also available in 32GB.
https://www.ebay.com/itm/Intel-SSD-SSDS ... 33e875124c

https://www.ebay.com/itm/Intel-X25-E-SS ... SwbmFanbqu

If the advantage of SLC SD cards is lower power & lower electrical noise then I would be a bit worried about these SATA drives power requirements - idle=0.06W Active=2.6W