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In Reply to: RE: Good Game Bernd posted by rickmcinnis@dogwoodfabrics.com on November 11, 2008 at 14:29:05
Rick, addjusting the potentiometer inside the antec case to the most left position gives you an output voltage of nearly 12v. (BIOS says 11.97v)
5v and 3.3v lines are not affected by the adjustment.
During my experimets with a dc/dc converter i was able to go down to 11.4V. The dc/dc converter has no circuits for regulating the 12V line (input=output). So i could feed the hole system with 11.4v by reducing the input voltage to a value of 11.4v. System was still stable, but SQ was loosing (less dynamic and a bit lame). To my ears 11,9v is optimal.
The goal is to power the system by batterie. I have done this already and SQ was winning big time! There is some work to do. I am searching for a circuit that to allows to plug in an external 12v PSU while the batterie is pluged in too. In "pluged in state" (psu) the batterie should be loaded AND the system should by powered by this external psu. It may be easy to accomplish this but there are some more things to consider. When running on batterie-only the voltage is dropping constantly. The PC may suffer damage if voltages goes to low and SQ is loosing below 11.9v also. (my findings). At minimum i want to have a warning LED.
Currently i am testing a new dc/dc converter that also regulates the 12v line. it is important to get a defined (regulated) 12v output, better 11.9v, so SQ is at high state all the time when system is powered by batterie only. Regulated dc/dc converters have a voltage drop. Mine is dropping voltage by 0.4v. So everything is fine when the batterie has an output above 12.4v which gives always a regulated atx-output voltage of 12v. If the batterie is down to 12v i am getting only 11.6v which is not enough.
A dropvoltage of 0.4v leads to the following "input, regulated output"-situation:
input, regulated output
-----------------------
25v, 12v (max input voltage)
.
.
15v, 12v
14v, 12v
13v, 12v
12.4v, 12v
12.3v, 11.9v (perfect)
12.2v, 11.8v (not enough)
12.1v, 11.7v (not enough)
.
.
So an regulated converter is solving the problem with high input voltages but when the batterie is drained too much things are getting worse. The solution may be a fat 12v-batterie so the voltage is not falling off too fast. The solution may be also a 18v-batterie. In case of a 18v-batterie the given batterie-capacity can be used more completely because batterie-voltage can fall to 16v or so without sideeffects.
I keep you posted, but it may take some time. I am constantly on it....
Well, now you know the hole storry. Originaly a had no intention to write it in detail, but it came out while writing....
i have done this consulting my dictionary only 10 times or so :-)
In short:
- When running the system by batterie SQ is absolutely winning.
- Reducing the voltage of the atx-12v-output has a big impact on SQ. To me SQ is definitvely increasing. My antec psu has an output of 12.4v. This value can be easily reduced by rotating the potentiometer inside the antec counterclockwise until stop. This leads to a 0.4v lower voltage, which is a lot compared to the BIOS-voltage-tweaks.
My new dc/dc converter deliveres 11.97 atx-output by default, so i think it is inside the specification.
Currently i dont care about the MB-onboard-regulators (maybe later). Interstingly PC-Health Screen in BIOS reports always exacly the 12v-atx-output voltage (12.4v with my unmodified antec psu). Has the MB 12v-regulators at all? I am no expert here...
Hm, i am wondering if i answered your initial questions :-)
thank you for new inspirations regarding the antec-fan and the Jon Risch Filter. The very good antec psu (tried many, antec IS best) is my reference when it comes to compare SQ.
have a nice day,
Bernd
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