Sigma11 to power a PicoPSU 60W ... heatsink help needed

HaLo6 · 22nd September 2009, 01:28 PM

Ok So I am designing a PC to use as a jukebox. I have a Aaeon EMB-945T motherboard with a Intel Core Duo T2300 processor, 2GB Ram, and a Juli@ Sound card...

From the motherboard specs typical current draw for the mobo in a slightly diff config is:
Power Consumption (Typical)
T7400 2.16GHz, DDRII 667 1GB
2.59A @ +12V, 2.88A @ +5V, 0.6A @ +3.3V

I plan on using a 75VA Toroid to supply 15VAC @ 5Amp to the Sigma 11 in order to get 12VDC @ 5 Amps out... (The supplied brick DC transformer was rated at 12VDC 5Amp)

Based on the typical current draw from the manufacturer what heat sinks should I be looking at using...

The PicoPSU will only power the mobo. I am using a separate PSU to power the HD's and Fans.

Any help would be appreciated as I am confused about heatsinking requirements..

star882 · 22nd September 2009, 01:44 PM

What's wrong with just using the included supply?

HaLo6 · 22nd September 2009, 02:03 PM

Nothing is wrong with it I just dont want to use an external brick, I am building this all in a custom case... and want just one power cable going into it. I am somewhat modelling this around "the art of computer transports" and attempting to use a cleaner PSU than the one supplied.

star882 · 22nd September 2009, 03:27 PM

Just mount the existing power supply in the box.

HaLo6 · 22nd September 2009, 06:24 PM

How does the existing PSU in a brick get away with its heatsinking requirement? I wanted to use the S11 because it is a cleaner supply. Based on the mobo specs is it just drawing a typical 31W, is that how much heat capacity the heatsinks need to shed?

star882 · 22nd September 2009, 09:45 PM

It is probably a high efficiency design. It will probably say "Efficiency Level" on it, with a number after it to indicate its efficiency level. It will probably be III or IV, maybe V if it's very new.
A better supply won't help since the 12v does not directly power the motherboard. It is converted into other voltages first. Just ask any experienced overclocker. Any good quality power supply is sufficient if it can handle the load.

HaLo6 · 24th September 2009, 01:59 PM

so there is no benefit to using the S11/Toroid over a DC wallwart?

star882 · 24th September 2009, 03:53 PM

If the wallwart is high quality (and in your case, it probably is), no real benefit.

HaLo6 · 24th September 2009, 10:31 PM

cool save me some trouble I guess...

HaLo6 · 24th September 2009, 11:20 PM

Ok so this was my inspiration for the internal look and theory... its the AudioVolver ...

22nd September 2009, 01:28 PM	#1
HaLo6 diyAudio Member Join Date: Dec 2008	Sigma11 to power a PicoPSU 60W ... heatsink help needed Ok So I am designing a PC to use as a jukebox. I have a Aaeon EMB-945T motherboard with a Intel Core Duo T2300 processor, 2GB Ram, and a Juli@ Sound card... From the motherboard specs typical current draw for the mobo in a slightly diff config is: Power Consumption (Typical) T7400 2.16GHz, DDRII 667 1GB 2.59A @ +12V, 2.88A @ +5V, 0.6A @ +3.3V I plan on using a 75VA Toroid to supply 15VAC @ 5Amp to the Sigma 11 in order to get 12VDC @ 5 Amps out... (The supplied brick DC transformer was rated at 12VDC 5Amp) Based on the typical current draw from the manufacturer what heat sinks should I be looking at using... The PicoPSU will only power the mobo. I am using a separate PSU to power the HD's and Fans. Any help would be appreciated as I am confused about heatsinking requirements..

22nd September 2009, 01:44 PM	#2
star882 diyAudio Member Join Date: Mar 2007	What's wrong with just using the included supply? __________________ "Fully on MOSFET = closed switch, Fully off MOSFET = open switch, Half on MOSFET = poor imitation of Tiffany Yep." - also applies to IGBTs!

22nd September 2009, 03:27 PM	#4
star882 diyAudio Member Join Date: Mar 2007	Just mount the existing power supply in the box. __________________ "Fully on MOSFET = closed switch, Fully off MOSFET = open switch, Half on MOSFET = poor imitation of Tiffany Yep." - also applies to IGBTs!

22nd September 2009, 09:45 PM	#6
star882 diyAudio Member Join Date: Mar 2007	It is probably a high efficiency design. It will probably say "Efficiency Level" on it, with a number after it to indicate its efficiency level. It will probably be III or IV, maybe V if it's very new. A better supply won't help since the 12v does not directly power the motherboard. It is converted into other voltages first. Just ask any experienced overclocker. Any good quality power supply is sufficient if it can handle the load. __________________ "Fully on MOSFET = closed switch, Fully off MOSFET = open switch, Half on MOSFET = poor imitation of Tiffany Yep." - also applies to IGBTs!

24th September 2009, 03:53 PM	#8
star882 diyAudio Member Join Date: Mar 2007	If the wallwart is high quality (and in your case, it probably is), no real benefit. __________________ "Fully on MOSFET = closed switch, Fully off MOSFET = open switch, Half on MOSFET = poor imitation of Tiffany Yep." - also applies to IGBTs!


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22nd September 2009, 02:03 PM	#3
HaLo6 diyAudio Member Join Date: Dec 2008	Nothing is wrong with it I just dont want to use an external brick, I am building this all in a custom case... and want just one power cable going into it. I am somewhat modelling this around "the art of computer transports" and attempting to use a cleaner PSU than the one supplied.

22nd September 2009, 06:24 PM	#5
HaLo6 diyAudio Member Join Date: Dec 2008	How does the existing PSU in a brick get away with its heatsinking requirement? I wanted to use the S11 because it is a cleaner supply. Based on the mobo specs is it just drawing a typical 31W, is that how much heat capacity the heatsinks need to shed?

24th September 2009, 01:59 PM	#7
HaLo6 diyAudio Member Join Date: Dec 2008	so there is no benefit to using the S11/Toroid over a DC wallwart?

24th September 2009, 10:31 PM	#9
HaLo6 diyAudio Member Join Date: Dec 2008	cool save me some trouble I guess...

24th September 2009, 11:20 PM	#10
HaLo6 diyAudio Member Join Date: Dec 2008	Ok so this was my inspiration for the internal look and theory... its the AudioVolver ...

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