Forums

pc motherboard grounds

Started by John Larkin August 25, 2012

The mounting holes on PC motherboards: are they usually connected to
the PCB ground plane?



-- 

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 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 -- | 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.
John Larkin wrote:
> > The mounting holes on PC motherboards: are they usually connected to > the PCB ground plane?
Yes.
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?
L thought you have been claiming to have laid out PWAs for the last several years. This is a no brainer. If you had ever assembled your own PC at any time, you would know the answer simply by examining the fastener/stud pack that comes with the motherboard.
On Sat, 25 Aug 2012 09:45:01 -0700, SoothSayer
<SaySooth@TheMonastery.org> 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? > > L thought you have been claiming to have laid out PWAs for the last >several years.
Decades. When I design stuff, I always bolt the pcb ground plane to the enclosure as many places as possible. But I don't know if pc mobos sometimes/never/always do that.
> > This is a no brainer.
OK, answer the question.
> > If you had ever assembled your own PC at any time, you would know the >answer simply by examining the fastener/stud pack that comes with the >motherboard.
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. -- 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 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. -- 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 25 Aug., 18:45, SoothSayer <SaySo...@TheMonastery.org> wrote:
> On Sat, 25 Aug 2012 09:34:54 -0700, John Larkin > > <jjlar...@highNOTlandTHIStechnologyPART.com> wrote: > > >The mounting holes on PC motherboards: are they usually connected to > >the PCB ground plane? > > =A0 L thought you have been claiming to have laid out PWAs for the last > several years. > > =A0 This is a no brainer. > > =A0 If you had ever assembled your own PC at any time, you would know the > answer simply by examining the fastener/stud pack that comes with the > motherboard.
how is the mounting HW going to tell you if the mounting holes are connected to the internal ground planes? -Lasse
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 -- | 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.
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/ -- Regards, Joerg http://www.analogconsultants.com/
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. -- 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