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In Reply to: RE: Baffled about computer power posted by theob on June 18, 2013 at 06:52:07
The Mac generates all of these other voltages internally, mostly using switch-mode regulators. Short of using large, hot Shunt-supplies, these are probably the most practical solution for the Mac internal needs.
Follow Ups:
Too bad the PC doesn't do the same. Thanks.
PC's are similar internally, but they require more power feeds at different voltages. The Mac
mini needs one voltage.
... then an inexpensive device like picoPSU or nanoPSU will do EXACTLY what's discussed here. Single 12V feed (from quality linear PS, of course), multiple voltage outputs. Rather standard part for custom audio builds, since not everyone wants to go the route of linear ATX PSU DIY craziness.Of course, you shouldn't really feed everything from it - and, unlike Macs, you don't have to. Best sonic results are achieved with feeding only MB from picoPSU, with CPU getting its own linear 12V, HD/SSD their own 12V/5V etc.
Edits: 06/20/13 06/20/13 06/20/13
not true; I would have thought you'd know, and you don't seem to.
.
Every PC I've seen has a power supply with multiple outputs.. typically +5, +12, and -12V
The mini power supply is a single voltage
As stated above the rest of the voltages required by the Mini are generated internally and derived from the single power supply voltage
.
Your statement is wrong; you haven't looked properly before your spoke so definitively.
Audioengr should know this.
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You can hide behind quick dismissals but you and I and everybody here is well aware of the fact that for many years the standard for PC motherboards has been a multiple input voltages........
You also know that is what he was referring to in his post
You also know that you are merely staying true to form by being your irascible self and wanting to try and argue otherwise..
silly silly silly
.
those who defend a falsehood by being crass.
"Every PC I've seen has a power supply with multiple outputs.. typically +5, +12, and -12V"
Really? SMH
http://www.intel.com/content/www/us/en/motherboards/desktop-motherboards/desktop-board-dn2800mt.html
http://www.intel.com/content/www/us/en/motherboards/desktop-motherboards/desktop-board-dh61ag.html
http://www.intel.com/content/www/us/en/motherboards/desktop-motherboards/nuc.html
.
I haven't bothered to keep up with PC motherboards so my statement is completely true
Every PC I've seen has a power supply with multiple outputs.. typically +5, +12, and -12V"
In any case the points made previously are absolutely true... the mini does run on a single supply voltage
./
This is a nonsensical statement even for this forum.
"I haven't bothered to keep up with PC motherboards so my statement is completely true
Every PC I've seen has a power supply with multiple outputs.. typically +5, +12, and -12V"
In any case the points made previously are absolutely true... the mini does run on a single supply voltage"
Was not giving you a hard time. Just that the Mini, (I also have one) is not as unique as Steve thinks. The mini is sort of a notebook style MB in a case, not a magic audio super computer. :) Recently switching to a Win 8 CAPS system has been a serious improvement.
You're correct. The main switch mode power supply in the Mini supplies just 12vdc while various local onboard DC-DC converters supply all other necessary voltages.
In fact, if you pull the small 12vdc SMPS from the Mac Mini, you can feed it directly with 12vdc from a battery or simple 12vdc linear supply.
Some aftermarket suppliers sell a filter network in the same form factor as the stock Mini 12vdc SMPS. You pull the SMPS and install the filter network in its place and feed it with external 12vdc from a linear supply or battery via a jack that is exposed externally on the back of the Mini.
It's a simple solution on the Mac Mini since you're not dealing with the typical PC power supply which minimally requires +12v/-12v, +5v/-5v. Modern PC power supplies with 24-pin connector (and associated wires) also supply +3.3vdc over a few parallel runs of cable and include a separate sense line to handle voltage drop.
PC motherboards have single 12V supply too.
"PC motherboards have single 12V supply too."
Sure, some do. Where did I say they don't exit? Besides, that's not what this conversation was about.
fmak's response to comments about Mac Mini requiring just 12vdc power supply:
...they require more power feeds...
Now that is untrue and bwb corrected you. You were completely wrong and you were corrected.
Pay attention.... and stop trying to divert attention away from your faux pas
nt
"PC's are similar internally, but they require more power feeds at different voltages. The Mac
mini needs one voltage."
The MAC Mini has no CPU??? Wow!!!
.
I have a mini and can assure you that the power supply generates a single voltage. It also has a CPU. How do you figure they are mutually exclusive?
.
"I have a mini and can assure you that the power supply generates a single voltage. It also has a CPU."
The comment was to Steve. There are PCs which function the exact same way.
Thought he might know better. It is called sarcasm...
regards
Bob
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I didn't and still don't see how having a single supply voltage would relate to whether or not something has a CPU.
Oh well, guess I'm just too dense to get the joke.
no worries
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