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RE: P24 current measurements

Robert,

Very useful information, sir! Thanks for doing & posting this.

This will be very useful for creating a fully-linear computer power supply... it's clear that the 12v P4 and the 5v ATX-24 lines are two of the key 'workhorse' lines.

One thought that may be useful for a fully linear CPS is to power each of the 5 5v lines with a separate power supply... regulator or battery. Powering them separately and measuring them separately may provide other information on how they are used and how we can best optimize each.

Another useful technique might be to use very high-quality supplies (again, regulated or battery) for the 3.3v and 12v, since they aren't pulling a lot of amps.

And of course, while it's useful to put additional filtering caps across each of these three voltage rails, based on your data I suspect that separate filtering caps across each of the 5 5v lines may provide additional benefits even if separate supplies are not implemented.

Its not surprising to me that the 'special' rails can be turned off after the computer is on (In fact, I bet that you could boot the PC with the -12v and the 5v standby turned off). One thing to note, tho, is that the -12v is used by the Juli@'s analog section (although in my setup before separately powering it, I was only measuring -9v at that point on the Juli@ board.

Two more things... give us more details on your battery-power setups, both for the P4 and the ATX-24. Then also, give us more details on the Mushkin memory... what other ones did you compare against, how is it superior to the others, and did you try other timings settings?

Thanks for the most provocative and useful post I've seen here in a long time (of course, besides the almost 2x weekly releases of new versions of cPLAY!).

Greg in Mississippi


Edits: 05/04/09
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