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In Reply to: RE: Revenge of the Power Supply Follies... posted by Bertel on March 25, 2009 at 01:18:49
That is very interesting information, Robert. In my setup, these two supplies power the LCD, the USB (for the wireless mouse and the touchscreen), and the HDD.One of the transformers is setup to produce ~18v which is fed to a 12v regulator which powers the LCD and the regulated 12v is fed to a 5v regulator which powers the on-board USB header that supplies the wireless mouse and touch-screen.
The other transformer produces ~9v which is fed to a second 5v regulator and it powers the HDD.
Because these are all plug-connected, I can try mixing and matching various combinations of the Granite Digital units with these linear supplies. I have gone back and forth between both linear 'dirty' supplies and both GD units, but I have not tried combinations of them. Possibly I can do that this weekend.
And no, I really don't have a good explanation for why this supply makes a difference... and why the quality of the supply's components is important. I really didn't want to spend the time last week and weekend to rebuilt the supply 3 times... but it wasn't satisfactory until I finally relented and used 'audiophile' components. Your suggestion that the harddrive may be responsible is a good line for inquiry. Sorry, I won't be purchasing an SSD to try this out in the near future!
I can also try a wired USB mouse to see if that makes any difference.
Greg in Mississippi
P.S. I just edited the post to add the picture... sorry, I'd intended to put it in when I first replied. It shows the inside of my cMP2 with both sets of linear supplies.
Edits: 03/25/09Follow Ups:
Greg,thanks for giving these details!
Absolutely, it would be great if you could find the time to do this "swapping test". I would be very interested in your findings if both of those two power rails make a difference in your setup (and in which way), or if "only" the PS for the HDD makes the difference - that would then be much in line with my results. Wired versus wireless mouse shouldn't make a difference at all - you can easily check by just unplugging the small sender or whatever you have there and see if it matters, in my case it doesn't. HDD probably is the path to follow - we'll see from your results!
I in turn would love to do this "swapping test" myself but currently can't - on my 5V "dirty" line there's only the USB power with a mouse connected, and I haven't managed yet to power this with any external PS I tried - it only works when there is also power draw from the SSD... Strange behavior which I simply can't understand, there surely is a solution to this but I had put this back for reason of other more important things to do (battery PS that is). If you now find that choosing a "proper" power supply for HD makes a difference then I'll have to be back on it to check what your results mean for SSD... ;-)
Cheers,
Robert
Edits: 03/25/09 03/25/09
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