Forums

pc motherboard grounds

Started by John Larkin August 25, 2012
On Sat, 25 Aug 2012 12:36:28 -0700 (PDT), whit3rd <whit3rd@gmail.com>
wrote:

>On Saturday, August 25, 2012 9:34:54 AM UTC-7, John Larkin wrote: >> The mounting holes on PC motherboards: are they usually connected to >> >> the PCB ground plane? > >Examine the hole; the ones with 'stitched' multiple PTH around 'em >are good grounds. Plated-through-hole with a mounting screw through >it might get the in-hole plating damaged, so the connection to >the inner vias is not otherwise reliable. > >Unreliable or not, it's common practice to snap a plastic button into >many (or most) of the mounting holes, and slide the buttons into >slots, with only one or two mount holes (the ones near >the external connectors) actually having conductive fastening >hardware.
You only need to use ONE metal stud. You CAN use them all, but you can also use nylon for all BUT ONE. They are all tied to ground, but only one needs to be to properly install it into a case. This assumes that the case is metallic, since some are not these days.
On Sat, 25 Aug 2012 12:44:40 -0700, SoothSayer <SaySooth@TheMonastery.org>
wrote:

>On Sat, 25 Aug 2012 10:35:27 -0700 (PDT), "langwadt@fonz.dk" ><langwadt@fonz.dk> wrote: > >>On 25 Aug., 19:17, Joerg <inva...@invalid.invalid> wrote: >>> John Larkin wrote: >>> >>> > The mounting holes on PC motherboards: are they usually connected to >>> > the PCB ground plane? >>> >>> I have seen both, probably best to take a look at the board you've got. >>> For example, this one appears to be heavily via'd to GND as I believe it >>> should be: >>> >>> http://imageshack.us/photo/my-images/195/inteldp35dpoxidation07.jpg/ >>> >> >>hard to tell from the pic but I think it looks like there is isolation >>around >>the pad so it doesn't connect to the top layer, might not connect >>internally >>either >> >>-Lasse > > I cannot believe you fuckers are so fucking lost.
It's easy to believe that you believe that, AlwaysWrong.
On Sat, 25 Aug 2012 12:42:27 -0700, SoothSayer <SaySooth@TheMonastery.org>
wrote:

>On Sat, 25 Aug 2012 10:17:25 -0700, Joerg <invalid@invalid.invalid> >wrote: > >> >>I have seen both, > > Bullshit. You could not name even a single MOBO that has isolated >mount holes. It world fail to comply with the spec, and no maker ever >took that chance. > > You are a liar. You have NOT "seen both".
AlwaysWrong is *always* wrong. Some come with plastic mounting posts, DimBulb.
On Sat, 25 Aug 2012 12:39:52 -0700, SoothSayer
<SaySooth@TheMonastery.org> wrote:

>On Sat, 25 Aug 2012 10:00:51 -0700, John Larkin ><jjlarkin@highNOTlandTHIStechnologyPART.com> wrote: > >> >>I have never assembled my own house, car, refrigerator, TV, or PC. I >>buy them all done and tested. I have more than enough electronics of >>my own to design. >> > > Your brilliance escapes any observation. Must all be super secret >stuff. > > I'll simplify the question for you, Mr. Electronics. > > How could you ever think that it would be isolated?
How come you never try to be helpful? Do you enjoy being held in contempt and ridicule by everyone here? Guess so. -- John Larkin Highland Technology Inc www.highlandtechnology.com jlarkin at highlandtechnology dot com Precision electronic instrumentation Picosecond-resolution Digital Delay and Pulse generators Custom timing and laser controllers Photonics and fiberoptic TTL data links VME analog, thermocouple, LVDT, synchro, tachometer Multichannel arbitrary waveform generators
On Sat, 25 Aug 2012 12:42:27 -0700, SoothSayer
<SaySooth@TheMonastery.org> wrote:

>On Sat, 25 Aug 2012 10:17:25 -0700, Joerg <invalid@invalid.invalid> >wrote: > >> >>I have seen both, > > Bullshit. You could not name even a single MOBO that has isolated >mount holes. It world fail to comply with the spec, and no maker ever >took that chance.
What spec? -- John Larkin Highland Technology Inc www.highlandtechnology.com jlarkin at highlandtechnology dot com Precision electronic instrumentation Picosecond-resolution Digital Delay and Pulse generators Custom timing and laser controllers Photonics and fiberoptic TTL data links VME analog, thermocouple, LVDT, synchro, tachometer Multichannel arbitrary waveform generators
On Sat, 25 Aug 2012 12:47:22 -0700, SoothSayer
<SaySooth@TheMonastery.org> wrote:

>On Sat, 25 Aug 2012 15:13:40 -0400, John Ferrell <W8CCW@arrl.net> wrote: > >>On Sat, 25 Aug 2012 09:34:54 -0700, John Larkin >><jjlarkin@highNOTlandTHIStechnologyPART.com> wrote: >> >>> >>> >>>The mounting holes on PC motherboards: are they usually connected to >>>the PCB ground plane? >>Usually, but not always! >>John Ferrell W8CCW > > Of course they ALL are, idiot. It is called a standard, and you ain't >bright enough to know that the makers had to follow one?
What standard? -- John Larkin Highland Technology Inc www.highlandtechnology.com jlarkin at highlandtechnology dot com Precision electronic instrumentation Picosecond-resolution Digital Delay and Pulse generators Custom timing and laser controllers Photonics and fiberoptic TTL data links VME analog, thermocouple, LVDT, synchro, tachometer Multichannel arbitrary waveform generators
On Sat, 25 Aug 2012 10:31:03 -0700, John Larkin
<jjlarkin@highNOTlandTHIStechnologyPART.com> wrote:

>On Sat, 25 Aug 2012 10:14:48 -0700, Jim Thompson ><To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> wrote: > >>On Sat, 25 Aug 2012 10:03:49 -0700, John Larkin >><jjlarkin@highNOTlandTHIStechnologyPART.com> wrote: >> >>>On Sat, 25 Aug 2012 09:40:54 -0700, Jim Thompson >>><To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> wrote: >>> >>>>On Sat, 25 Aug 2012 09:34:54 -0700, John Larkin >>>><jjlarkin@highNOTlandTHIStechnologyPART.com> wrote: >>>> >>>>> >>>>> >>>>>The mounting holes on PC motherboards: are they usually connected to >>>>>the PCB ground plane? >>>> >>>>depends. Are you wearing them like you should ?:-) >>>> >>>> ...Jim Thompson >>> >>>You never actually say anything with content any more. You don't even >>>discuss circuits in any intelligent way. You've become a useless old >>>hen. >> >>And your WORKING circuits are WHERE ?:-) >> >> ...Jim Thompson > >A few are here: > >http://www.highlandtechnology.com/index.shtml > > >Any your fast current source is where? You can't do it! > >I rather liked the mosfet-bipolar cascode with Ib correction, but you >didn't. What did you find wrong with it? I mean, aside from the fact >that I invented it. Are you claiming that this *won't* work? > >https://dl.dropbox.com/u/53724080/Circuits/Isrc_Ib_2.JPG > > >But I have a couple of better, cuter circuits by now. Show us your >approach, and then I'll post a couple more of mine. > >You never say anything substantive about electronics lately. You can't >invent circuits any more. Go back to sci.electronics.basics where >amateurs belong.
Show some LTspice .ASC files that can be checked. Then people will believe your claims. ...Jim Thompson -- | James E.Thompson, CTO | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona 85048 Skype: Contacts Only | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | I love to cook with wine. Sometimes I even put it in the food.
On Sat, 25 Aug 2012 15:59:56 -0400, "krw@att.bizzzzzzzzzzzz"
<krw@att.bizzzzzzzzzzzz> wrote:

>On Sat, 25 Aug 2012 12:42:27 -0700, SoothSayer <SaySooth@TheMonastery.org> >wrote: > >>On Sat, 25 Aug 2012 10:17:25 -0700, Joerg <invalid@invalid.invalid> >>wrote: >> >>> >>>I have seen both, >> >> Bullshit. You could not name even a single MOBO that has isolated >>mount holes. It world fail to comply with the spec, and no maker ever >>took that chance. >> >> You are a liar. You have NOT "seen both". > >AlwaysWrong is *always* wrong. Some come with plastic mounting posts, >DimBulb.
And there will ALWAYS BE a metallic screw or stud/standoff included, you fucking zero memory retard!
On Sat, 25 Aug 2012 13:51:03 -0700, John Larkin
<jjlarkin@highNOTlandTHIStechnologyPART.com> wrote:

>How come you never try to be helpful? Do you enjoy being held in >contempt and ridicule by everyone here? > >Guess so. > >
You do not get to foist your standard MO onto others.
On Sat, 25 Aug 2012 13:51:57 -0700, John Larkin
<jjlarkin@highNOTlandTHIStechnologyPART.com> wrote:

>On Sat, 25 Aug 2012 12:42:27 -0700, SoothSayer ><SaySooth@TheMonastery.org> wrote: > >>On Sat, 25 Aug 2012 10:17:25 -0700, Joerg <invalid@invalid.invalid> >>wrote: >> >>> >>>I have seen both, >> >> Bullshit. You could not name even a single MOBO that has isolated >>mount holes. It world fail to comply with the spec, and no maker ever >>took that chance. > >What spec?
The AT design sped. Covers Power supplies, cases, FCC Rule 15 compliance, emissions standards... things like that. But YOU should already be familiar with many of the standards, and especially the one which would require tying the motherboard ground plane to the chassis. YOU should already know all about why and the post should never have been made. Then, there is basic common sense to follow as well. You seem to lack any modicum of that as well.