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In Reply to: RE: cMP - the open source high-end Memory Player posted by cics on December 30, 2007 at 05:42:01
I just finished assembling the wooden computer case I will be using to house my new cmp2 system.
Looking at the mobo, I see that the screw holes seem to have some conductive elements and since normal computer cases are metal i am assuming that the motherboard in a normal case gets grounded when one screws it into the case.
Is this true, and if so for those of you who have also built a case of wood, how did you handle the grounding?
On a similar note I was thinking of using t-shield for some shielding and it was recommended that I tie the shielding into the ground on the psu. Is that correct, and would I also tie in the mobo at this point too??
And did you screw the mobo right into the wood, or did you use some kind of stand off so the mobo was slightly above the wood? If so what did you use for a stand off?
TIA
Follow Ups:
First I want to say I'm no EE or grounding expert.
With that said, I'm slowly working towards a wood support for my cMP2 (not really a case) with separate metal shielding enclosures for the motherboard and the power supplies. I intend to tie the metal shield around the motherboard to the board. I also bring all my power supply grounds to the motherboard via the PS connections, making the motherboard ground plane the star (since that's where most of the circulating currents are created).
Theob, I keep meaning to respond to your original post about connecting to the wall socket gound and just haven't... I've been doing that too since going with the separate linear power supplies and also noted a difference (slight and subtle, but noticable).
On standoffs, I'd use either wood, brass, copper, or nylon, in that order of preference. I have damping rings from Herbie's tube dampers around the aluminum standoffs in my Zalman case and that also makes a worthwhile difference. An interesting thing about this is that at one point, I another 10 or so dampers just setting between the motherboard and the case bottom in addition to the dampers on the standoffs... that was WAY too dull. It was one of the first times I've ever gotten something over-damped.
Later!
Greg in Mississippi <- working on separate I2S-connected DAC cards now.
I have my cmp in a metal case and all I can say is that when I grounded the mobo to a wall mains outlet screw another level of transparency was achieved. At first I thought I was hearing things so I asked my wife to choose a preference (sonically) between grounded and ungrounded and she heard what I heard. So try it for yourself.
Hey Theob,
How did you ground it?
Run a wire from a screw to the screw on an outlet?
yes make sure its a screw on the mobo.
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