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IWETHEY Home / IWETHEY Board / Hardware Forum / Don't recall ever seeing "ground loop" mentioned . .
Post #41,706
by Andrew Grygus
Picture of Andrew Grygus
6/9/02 2:31:35 AM
Reply
New Don't recall ever seeing "ground loop" mentioned . .
. . in regard to computers, though it certainly is in audio stuff, where a signal can still be "significant" at a very tiny % of the main signal.

Many older boards were, however, essentially "single ground point" with one screw up near the power connection and everything else supported by plastic standoffs. The three 200-MHz and 233-MHz AMD K6 boards I just stripped out of computers one of my clients made me haul away are like that.

Current motherboard thinking seems to be "ground plane" with as much sheet within the board as possible and 7 to 9 ground to chasis points. Plastic motherboard standoffs are no longer used at all, it's all "bolt to metal" now.
[link|http://www.aaxnet.com|AAx]
Post #41,792
by Ashton
6/10/02 1:59:14 AM
Reply
New Could be mfg.-memory on that phrase..
After all - it is an analog phenom. (Could screw up small biases though) But now I'm curious, so will make trip to basement and see if one of the manuals survived..

As to that 'encapsulated ground plane' thingie - recall a few years ago in ED (Elec. Design) a treatise on the mb difficulties of getting the design s/ware to produce a decent model for producing good pulse rise-times (article was re RAMBUS at the time - showing GHz fancy 'eye' displays on a $60 K HP scope). Outta my league. But RAMBUS sounded like a loooser, even then - you Needed that HP just to *check* a module! they said; forget the little $1-400 memory tester boxes. Ugh.

Not surprising then, that the new mbs might want multiple good edge grounds, even if the GHz stuff is localized - the memory sockets spread it out.

Yawn.. we're all getting jaded with GHz stuff everywhere, while nobody knows Ohm's Law.


Ashton
     Can someone help me troubleshoot this problem? - (cwbrenn) - (32) - June 4, 2002, 03:04:22 PM EDT
         Sounds like a power problem to me. - (Another Scott) - June 4, 2002, 03:19:10 PM EDT
         one off the wall maybe - (boxley) - (2) - June 4, 2002, 04:34:32 PM EDT
             I'll try that. - (cwbrenn) - (1) - June 4, 2002, 05:06:53 PM EDT
                 Alas, alack. - (cwbrenn) - June 4, 2002, 10:21:58 PM EDT
         Best bet for testing PS - (Steven A S) - (1) - June 4, 2002, 04:34:46 PM EDT
             I've gone one further than that. - (cwbrenn) - June 4, 2002, 05:04:12 PM EDT
         Hehehe.... Okay. Now we really get sticky... - (folkert) - (10) - June 4, 2002, 10:26:34 PM EDT
             you mean... it might be a problem with the TOWER? - (cwbrenn) - (5) - June 4, 2002, 10:41:30 PM EDT
                 Case in point! - (folkert) - (4) - June 4, 2002, 11:15:20 PM EDT
                     Ok, it's not the case - (cwbrenn) - (3) - June 5, 2002, 10:57:44 AM EDT
                         BOG.... - (folkert) - June 5, 2002, 09:13:38 PM EDT
                         On using force - - (Ashton) - (1) - June 6, 2002, 01:40:39 AM EDT
                             Grounding motherboards. - (static) - June 6, 2002, 08:00:48 AM EDT
             Uh.. yeah - (Ashton) - (3) - June 4, 2002, 10:59:06 PM EDT
                 Saw a huge batch... - (folkert) - (2) - June 4, 2002, 11:30:00 PM EDT
                     PC electronics appears most often to be a POS - (Ashton) - (1) - June 5, 2002, 12:25:18 AM EDT
                         Splain'd - (folkert) - June 5, 2002, 09:05:28 PM EDT
         Longshots - (Ashton) - June 4, 2002, 10:47:21 PM EDT
         The more I test, the more confused I get - (cwbrenn) - (1) - June 5, 2002, 12:01:13 PM EDT
             Speak of the devil.... - (Another Scott) - June 5, 2002, 12:29:54 PM EDT
         Interesting. Encouraging results. - (cwbrenn) - (2) - June 6, 2002, 05:22:04 AM EDT
             You call that encouraging? - (drewk) - (1) - June 6, 2002, 10:32:07 AM EDT
                 Yeah, well... - (cwbrenn) - June 6, 2002, 11:40:16 AM EDT
         Mysterly solved... and I AM AN IDIOT :) - (cwbrenn) - (8) - June 6, 2002, 04:24:04 PM EDT
             This is like the 'made for IE' pages that break in Mozilla - (drewk) - June 6, 2002, 04:45:20 PM EDT
             Idiot? Come on! - (Meerkat) - June 6, 2002, 08:13:36 PM EDT
             Not an idiot. - (static) - (5) - June 6, 2002, 10:32:30 PM EDT
                 Definitely Not an idiot. - (jbrabeck) - (4) - June 7, 2002, 09:02:06 AM EDT
                     Oddly though - - (Ashton) - (3) - June 7, 2002, 07:06:47 PM EDT
                         That's rare! - (static) - June 9, 2002, 02:14:42 AM EDT
                         Don't recall ever seeing "ground loop" mentioned . . - (Andrew Grygus) - (1) - June 9, 2002, 02:31:35 AM EDT
                             Could be mfg.-memory on that phrase.. - (Ashton) - June 10, 2002, 01:59:14 AM EDT

Unfortunately, with great ambition comes great shit hitting the fan.
104 ms