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Old 11th June 2009, 02:05 PM   #1
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Default F1 heatsink?

I'm considering building an F1 but Im having problems sourcing a good heatsinked case. The one that is easiest for me to get hold of is the Pesante series from Hifi2000. I'm unsure if they have good enough heatsinks for this beats though. Any thoughts?
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Old 21st April 2010, 08:26 PM   #2
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I'm thinking about it too...
In other posts I red you have to multiply the thermal resistance for the power to dissipate (in Watt) to have the delta temperature ABOVE room temperature.

Click the image to open in full size.

I think model 04/300 should be fine...
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Old 21st April 2010, 10:24 PM   #3
cjkpkg is offline cjkpkg  United States
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I am using the HIFI2000 4U/300 for my F5 which requires 0.6C/W per transistor - there are 2 per channel. It hovers around 65C at 1.6A bias. I was running 1.7A and I could only touch them for a second or two.

Not sure of the requirements of the F1 - hope this helps.
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Old 22nd April 2010, 08:42 AM   #4
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Ok, it seems the specs provided are ok:
0.31*(62*2)=38.44 above room temperature (maybe 25 in your home).
F1 dissipates 100W per channel (F5, instead, 124W, 62 per transistor), so I think a 3U can be used.
Am I right?
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Old 22nd April 2010, 08:50 AM   #5
massimo is offline massimo  Italy
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F5 dissipates 66W/ch, not 124.
The Pesante Dissipante 4U/400 can handle 100 W per side.
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Old 22nd April 2010, 09:22 AM   #6
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Quote:
Originally Posted by massimo View Post
F5 dissipates 66W/ch, not 124.
The Pesante Dissipante 4U/400 can handle 100 W per side.

F5 o.m. said:
"At 1.3 amps per channel, you will see idle heat dissipation of 62 watts. To keep the temperature rise of the heat sink to 20 deg C. above the ambient temperature, you will want a heat sink rated at about .6 deg C./watt for each transistor. An example of this would be a chunk of fi nned aluminum, with a series of 2 fi ns attached to an 8 by 6 base. You will need two per channel."
F1 o.m said:
"Place the amplifier in a well-ventilated location, as it draws 200 watts during operation and requires as much opportunity to cool itself as possible."
I'm doing something wrong but I can't understand what...
perhaps trying to build an amplifier?
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Old 22nd April 2010, 01:08 PM   #7
cjkpkg is offline cjkpkg  United States
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F1 manual

"The voltage across R27 – R30 is approximately 0.60 volts DC, and this
figure sets the bias for the gain stages, which is slightly less than 2 amps
per side, 4 amps total."

I would definitely not go below a 4U size - and with slightly less than 2A bias per channel probably go for the 400mm. If depth is a concern then go for the 5U/300.
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Old 25th December 2012, 11:32 PM   #8
mike23 is offline mike23  United Kingdom
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Hi, does anyone have the dissapation spec for the
mini aleph? I will us the KK-PCB boards.
I was going to use a 3U pessante dissapante.

Ta
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