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Old 20th February 2012, 03:44 PM   #251
CeeVee is offline CeeVee  Portugal
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Quote:
Originally Posted by lhquam View Post
There are good low noise fans. I use a Noctua NF-S12-1200 in my F5 and the fan isn't noticeable.
I do the same with a "babysitter" for another class A amp i have , summer in Lisbon is Hot and i want to keep hearing music.

And ...the fans will be even quieter if run at lower than rated voltage, all we need is air movement really not a hurricane....

I get 20ºC lower heatsink temp with two of these fans on the "babysitter", one each side.

In winter i don't need this helper.
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Old 20th February 2012, 03:56 PM   #252
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Originally Posted by lhquam View Post

BTW: What are the dimensions of the F5-Turbo-v2/3 board?
280mm x 50mm
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Old 20th February 2012, 04:44 PM   #253
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Thanks Andy.

Perfect. so I am in for two (2) amp boards (no PSU boards for me) please. cheers, >
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Old 20th February 2012, 04:47 PM   #254
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Quote:
Originally Posted by lhquam View Post
Noctua NF-S12-1200
Impressive fan.
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Old 20th February 2012, 05:07 PM   #255
a.wayne is offline a.wayne  United States
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Quote:
Originally Posted by lhquam View Post
I ran a NatSink convection simulation for the 400mm(W) x 83mm(H) x 200mm(L) heatsink with 8 MOSFETS dissipating 22 watts each. (400x83 appears to be the lowest C/W heatsink they make). The simulation shows a temperature rise of about 40C. Not good enough.
Do you really want that much bias per fet .....?
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Old 20th February 2012, 05:10 PM   #256
a.wayne is offline a.wayne  United States
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Originally Posted by jacco vermeulen View Post
Impressive fan.
One would have thought curved blade (quite) instead of straight .....
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Old 20th February 2012, 05:22 PM   #257
lhquam is offline lhquam  United States
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Here is a heatsink simulation based on using 1-1/2 HeatsinkUSA E007.
Unfortunately, HeatsinkUSA doesn't make anything wider than 256 mm, so I cut one E007 in half and weld it to a full E007 to make a 36 fin 384 wide. The resulting heatsink is 384 mm (W) x 130 mm (L) x 74 mm (H), with a baseplate thickness of 9.5 mm and has 36 fins. Too bad that such a heatsink isn't available off-the-shelf.

The simulation assumes 8 MOSFETs dissipating 22 watts each spaced according to the F5-Turbo-v2/3 layout. I also assume FORCED CONVECTION. The image shows the heat rise using .693 m/s air flow rate. Looks pretty good.

I imagine assembling two such heatsinks with the fins facing each other and using 3x 120mm low-noise fans in the same manner I used with the F5 shown HERE: F5 power amplifier
Attached Images
File Type: jpg e007-1p5-130.jpg (52.2 KB, 368 views)
File Type: jpg e007-1p5-130-b.jpg (202.8 KB, 361 views)
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Old 20th February 2012, 05:25 PM   #258
lhquam is offline lhquam  United States
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Originally Posted by a.wayne View Post
Do you really want that much bias per fet .....?
What is the intended bias for the F5-Turbo? My number was based on the 800 VA power supply sizing.
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Old 20th February 2012, 06:18 PM   #259
labjr is offline labjr  United States
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I made a post a few days back regarding heatsinking. Doesn't seem practical to have eight output devices on one heatsink.
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Old 20th February 2012, 06:29 PM   #260
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Quote:
Originally Posted by lhquam View Post
heatsink simulation
81 cubic meter per hour (48CFM) is about 2m/s air velocity for a 4-2/3" gauge fan.
47.9 (0.2m/s) divided by 19.2 (2.01m/s) is ~2.5x

Still, very nice fan, the newer 100m3 model looks great, i want boat screws like that.
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