FW: Building computer - power supplies

2013-09-29 Thread Mark Allums
Yes, though they are for different voltages, typically 3.3V and 2.5V or 1.8V, see the voltage monitoring in the BIOS or MB monitor for the values for a particular board. You'll find two inductors, probably toroids, and a group of tall aluminium electrolytic capacitors in the area. These

Re: Building computer - power supplies

2013-09-29 Thread Joel Rees
On Sun, Sep 29, 2013 at 5:18 AM, Doug dmcgarr...@optonline.net wrote: On 09/28/2013 03:23 PM, Stan Hoeppner wrote: On 9/27/2013 6:37 PM, Joel Rees wrote: On Fri, Sep 27, 2013 at 9:36 PM, Stan Hoeppner s...@hardwarefreak.com wrote: A point I forgot to make. This is something everyone should

Re: Building computer - power supplies

2013-09-29 Thread Ralf Mardorf
On Sun, 2013-09-29 at 19:02 +0900, Joel Rees wrote: I7m confused. Did you mean can't produce a gain in current or power? Assumed there should be a linear voltage regulator able to provide the needed Ampere, how large should the heat sink be? The voltage isn't an issue. By a quick search I found

Re: Building computer - power supplies

2013-09-29 Thread Doug
On 09/29/2013 06:02 AM, Joel Rees wrote: On Sun, Sep 29, 2013 at 5:18 AM, Doug dmcgarr...@optonline.net wrote: /snip/ Do I understand correctly that there are two switching power supply chips at the input to the CPU to produce 3.3Volts? Obviously, a linera regulator cannot produce and gain in

Re: Building computer - power supplies

2013-09-29 Thread Doug
On 09/29/2013 06:47 AM, Ralf Mardorf wrote: On Sun, 2013-09-29 at 19:02 +0900, Joel Rees wrote: I7m confused. Did you mean can't produce a gain in current or power? Assumed there should be a linear voltage regulator able to provide the needed Ampere, how large should the heat sink be? The

Re: Building computer - power supplies

2013-09-29 Thread Ralf Mardorf
On Sun, 2013-09-29 at 11:36 -0400, Doug wrote: So a linear regulator is a lossy device law of conservation of energy --- energy exchange -- thermal conduction If you use it as voltage stabiliser + heater, it provides 100% efficiency too. It's simply a question of the point of view. ;) -- To

Re: Building computer - power supplies

2013-09-29 Thread Ralf Mardorf
On Sun, 2013-09-29 at 13:20 -0400, Doug wrote: On 09/29/2013 06:47 AM, Ralf Mardorf wrote: On Sun, 2013-09-29 at 19:02 +0900, Joel Rees wrote: I7m confused. Did you mean can't produce a gain in current or power? Assumed there should be a linear voltage regulator able to provide the

Re: Building computer - power supplies

2013-09-29 Thread David Guntner
From http://www.debian.org/News/weekly/2011/05/#offtopic ... Have you ever wanted to discuss things completely unrelated to Debian or even computers with fellow users or developers? On debian-user the custom is to put [OT] in the subject and fire away. Unfortunately, this can be disruptive for

Re: Building computer - power supplies

2013-09-29 Thread Joel Rees
On Mon, Sep 30, 2013 at 12:36 AM, Doug dmcgarr...@optonline.net wrote: On 09/29/2013 06:02 AM, Joel Rees wrote: On Sun, Sep 29, 2013 at 5:18 AM, Doug dmcgarr...@optonline.net wrote: /snip/ Do I understand correctly that there are two switching power supply chips at the input to the CPU to

Re: Building computer - power supplies

2013-09-28 Thread Stan Hoeppner
On 9/27/2013 6:37 PM, Joel Rees wrote: On Fri, Sep 27, 2013 at 9:36 PM, Stan Hoeppner s...@hardwarefreak.com wrote: A point I forgot to make. This is something everyone should know. Subject: The marketing myth of multiple +12V rails [...] What I want to know is why Intel CPUs still need

Re: Building computer - power supplies

2013-09-28 Thread Doug
On 09/28/2013 03:23 PM, Stan Hoeppner wrote: On 9/27/2013 6:37 PM, Joel Rees wrote: On Fri, Sep 27, 2013 at 9:36 PM, Stan Hoeppner s...@hardwarefreak.com wrote: A point I forgot to make. This is something everyone should know. Subject: The marketing myth of multiple +12V rails [...]

Re: Building computer - power supplies

2013-09-28 Thread Joe
On Sat, 28 Sep 2013 16:18:30 -0400 Doug dmcgarr...@optonline.net wrote: On 09/28/2013 03:23 PM, Stan Hoeppner wrote: On 9/27/2013 6:37 PM, Joel Rees wrote: On Fri, Sep 27, 2013 at 9:36 PM, Stan Hoeppner s...@hardwarefreak.com wrote: A point I forgot to make. This is something everyone

Re: Building computer - power supplies

2013-09-28 Thread Stan Hoeppner
On 9/28/2013 3:18 PM, Doug wrote: On 09/28/2013 03:23 PM, Stan Hoeppner wrote: On 9/27/2013 6:37 PM, Joel Rees wrote: On Fri, Sep 27, 2013 at 9:36 PM, Stan Hoeppner s...@hardwarefreak.com wrote: A point I forgot to make. This is something everyone should know. Subject: The marketing myth

Re: Building computer - power supplies

2013-09-28 Thread Ralf Mardorf
On Sat, 2013-09-28 at 19:15 -0500, Stan Hoeppner wrote: However, another cost saving aspect to this I didn't mention previously is component commonality. If a vendor sizes it PSUs optimally, most if not every PSU in the line can use the same regulator FETs. For instance, a 25A regulator can

Re: Building computer - power supplies

2013-09-27 Thread Stan Hoeppner
A point I forgot to make. This is something everyone should know. Subject: The marketing myth of multiple +12V rails Switching regulator MOSFETs provide the 3.3, 5/5VSB, and 12VDC output current of a PC PSU. Before the days of waffle iron CPUs and GPUs, PSUs had a single 12V regulator

Re: Building computer - power supplies

2013-09-27 Thread Ralf Mardorf
On Fri, 2013-09-27 at 07:36 -0500, Stan Hoeppner wrote: It simply makes wiring your PC more difficult, as you have to balance your 12V devices across an arbitrary boundary placed across the 12V output current of your power supply. And of course, now you should be asking yourself, given what

Re: Building computer - power supplies

2013-09-27 Thread Doug
On 09/27/2013 09:21 AM, Ralf Mardorf wrote: /snip/ However, undersized voltage for capacitors for switching power supply is an often used fraud against consumers and switching power supplies pollute the mains. Exotic resistors sometimes make them a PITA when you want to repair one and you

Re: Building computer - power supplies

2013-09-27 Thread Joel Rees
On Sat, Sep 28, 2013 at 2:29 AM, Doug dmcgarr...@optonline.net wrote: On 09/27/2013 09:21 AM, Ralf Mardorf wrote: /snip/ However, undersized voltage for capacitors for switching power supply is an often used fraud against consumers and switching power supplies pollute the mains. Exotic

Re: Building computer - power supplies

2013-09-27 Thread Joel Rees
On Fri, Sep 27, 2013 at 9:36 PM, Stan Hoeppner s...@hardwarefreak.com wrote: A point I forgot to make. This is something everyone should know. Subject: The marketing myth of multiple +12V rails [...] What I want to know is why Intel CPUs still need the +12V. Have you considered copying

Re: Building computer - power supplies

2013-09-27 Thread Ralf Mardorf
On Sat, 2013-09-28 at 08:25 +0900, Joel Rees wrote: But the upshot is that capacitors are exposed to higher voltages and/or effective power than they can handle, and get burned, and it is a manufacturing problem, and sometimes an engineering problem. And sometimes vendors knowingly use