JohnSwenson wrote: > Thanks Kuro, > that's the type of info I'm interested in. I see the PSAA15W brick at > digikey for $11.24, is this what you are talking about? > > That brings up an interesting question, do we go with a wallwart with > interchangeable pin adapters, or a brick which uses a standard cord > connector and let the user get the right cord. That PSAA15W brick looks > like a good choice for this project. It seems to be widely available. > > I have been trying out different plugs and devices with 2.1 or 2.5 sizes > and at least with what I have a 2.5 plug will usually work fine with a > 2.1 jack, but the 2.1 plug does not work with a 2.5 jack. So if we > put a 2.1 jack on the board, then either a 2.1 or 2.5 plug should work. > That seems like the most compatible situation I can come up with. > > John S.
Hi John, The one I'm using is PhiHong PSAA20R-050-R, but it is more expensive (~$18). This is the same looking one you get with the SBT. PSAA15W uses a power cord instead of interchangeable plates for the plugs. I think for a $200 product, it is an overkill if someone wants to put in a $100+ power cord. Personally, I'm not a strong believer in a fancy power cord, I'd rather see the $ put in the right places, ie: the circuit itself. You can use all the fancy linear power supply and power cord you want, but if you use DC-DC converters inside the DAC then all is lost. I see most modders and DIYers putting $ in the wrong places. BTW, is there any reason why ESS9023 is not chosen as the DAC chip? One can buy the AQ Dragonfly for $250 (it was designed by Gordon Rankin and it runs Streamlength code over the USB) and you add a Pogoplug for $25 (Pogoplug + 4GB thumb drive) and you have a very capable DAC running Squeezelite. If you look around, you can buy the Dragonfly for around $200 and I got my Pogoplug for $13. This is in the same price point on the product you guys are trying to build. As for low jitter clock, I've been working on ultra low jitter clocks for the past 3 years. The clock I'm using now has -89dBC @ 1Hz. My minimum would be the Crystek CCHD-957 (-50dBC @ 1Hz), you can get pretty amazing sound with it (The Anedio D2, Resonessence Invicta, and Light Harmonic Da Vinci DACs are all using the CCHD-957). But that's $30 a pop and it also requires fancy power supply to make it work properly. I don't think you guys have the budget to get this in this product, but I'd take a look at Crystek C3391. C3391 is supposed to be very low in jitter (same measurement as CCHD-957 if you can believe that), except that Crystek does not guarantee this performance. Where as the low jitter performance of CCHD-957 is guaranteed. C3391 is only ~$2.5 and you need two. Finally, I agree that you should put a 2.1mm DC-in jack on the board. Best compatibility with all the 2.1 and 2.5mm power supplies out there. ------------------------------------------------------------------------ Kuro's Profile: http://forums.slimdevices.com/member.php?userid=16701 View this thread: http://forums.slimdevices.com/showthread.php?t=97881 _______________________________________________ discuss mailing list [email protected] http://lists.slimdevices.com/mailman/listinfo/discuss
