Kuro wrote: > Gold is necessary in parts of the world where you have very humid > climate or where you live close by the sea. Gold prevents the > connectors from corroding. In HK where I live, this is absolutely > necessary. In fact, cheap connectors with thin layer of gold don't work > too good either. > > On another note... I have the intention to purchase the final DAC > carrier board. My understanding is that the whole thing is to be fitted > in a Hammond 1455T case. If this is the case, would there be room to > add a micro SD card slot and two USB ports? I know the micro SD card > slot issue has been brought up in the CSOS F19 thread recently. Now, > having the card slot that is accessible by the user is great for > updating the OS, etc. But more importantly, I'm thinking what if we put > a faster micro SD controller in there to speed up the OS? Specifically, > I run the LMS on my Wandboard Quad and I see that the speed of LMS is > pretty much limited by the disc read/write speed (disc=micro SD). I'm > using the Toshiba Exceria Type HD micro SD card. This card has 30MB/s > write and 95MB/s read speed and it only costs me <US$9 for 8GB. It'd be > nice to be able to make use of a fast micro SD to speed up LMS or the OS > in general. > > Finally, I have a suggestion for decoupling caps. I'd avoid using X7R > ceramics as they are microphonics. For all my projects, I use Panasonic > ECPU (or Cornell Dubilier) acrylic (PPS) films. They sounds wonderful > and the only problem is that they do take up slightly more space. The > size of a 0.1uF is 0805 instead of 0603 or smaller. IMHO, it is well > worth it for using this film caps in all places instead of regular > ceramics.
There is no room at all for an Sd card slot on the back. There are 5 USB connectors (2 full size and 3 micro) already on the back. The boot SD card is part of the module and can be changed any time you wish, you just have to unscrew the front or back panel and slide the board out, change the SD card and replace. You can connect a USB interface SSD to the back or inside. There are three micro USB connectors on the board itself so you could put a small SSD inside. At this point I don't have a mounting bracket for such a thing. Additionally the quad has a SATA port which could be used for a small SSD inside. There is also a longer case with the same width and height, it would be easy to fit a 2.5" HD inside this case. On the caps, ceramics are used for the digital sections and PPS are used in some places for the analog section. I'm not using them every where, just where experience has shown them to be an advantage. John S. ------------------------------------------------------------------------ JohnSwenson's Profile: http://forums.slimdevices.com/member.php?userid=5974 View this thread: http://forums.slimdevices.com/showthread.php?t=97881 _______________________________________________ discuss mailing list discuss@lists.slimdevices.com http://lists.slimdevices.com/mailman/listinfo/discuss
