Heat Sinks
I have the P Daniel a30 pcb's as well. Parts Express may be a source for a transformer. To me the biggest issue is the heatsink. I was wondering if 2 extrusions 12"x5.375, .375 thick base plate with 1" tall fins would be enough cooling? They are available on ebay. I could also set up a computer fan for extra airflow.Any opinions on this?
Thanks
I have the P Daniel a30 pcb's as well. Parts Express may be a source for a transformer. To me the biggest issue is the heatsink. I was wondering if 2 extrusions 12"x5.375, .375 thick base plate with 1" tall fins would be enough cooling? They are available on ebay. I could also set up a computer fan for extra airflow.Any opinions on this?
Thanks
maybe this is of interest to us Pass amp fans. found it while digging thru ebay
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=280076820327&ssPageName=MERC_VIC_RUPX_RUPX_Pr4_PcY_BIN_Stores_IT&refitem=280074032679&itemcount=4&refwidgetloc=closed_view_item&usedrule1=UpSell_LogicX&refwidgettype=cross_promot_widget
i have know idea if this would help in building a A30, but it is a heap of sinks!
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=280076820327&ssPageName=MERC_VIC_RUPX_RUPX_Pr4_PcY_BIN_Stores_IT&refitem=280074032679&itemcount=4&refwidgetloc=closed_view_item&usedrule1=UpSell_LogicX&refwidgettype=cross_promot_widget
i have know idea if this would help in building a A30, but it is a heap of sinks!
I picked up a six of these heatsinks from BGMicro. Their shipping is kinda high, but the price for the sinks makes it an ok deal.
I can't decide if I need to use two or three of them per channel.
I can't decide if I need to use two or three of them per channel.
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I just recieved my parts from
http://www.tech-diy.com/hexfets.htm
matched triplets of IRFP240's and pairs of IRF9610's
A note is in order. That site lists IRFP9610's. I corresponded to ask about that. They are IRF9610's. I'm sure there will be a change to the site when he gets around to it.
If you want to combine several items into one shipment it probably would be of benefit to send a note about that also.
The parts arrived in rails and anti-static bags. A good source.
http://www.tech-diy.com/hexfets.htm
matched triplets of IRFP240's and pairs of IRF9610's
A note is in order. That site lists IRFP9610's. I corresponded to ask about that. They are IRF9610's. I'm sure there will be a change to the site when he gets around to it.
If you want to combine several items into one shipment it probably would be of benefit to send a note about that also.
The parts arrived in rails and anti-static bags. A good source.
Pathmark, looks like you will have good heatsinking, I have not yet bought any parts!
I think the thickness of the heatsink base plate is important, a thicker plate will spread the heat better and avoid local hot spots.Still looking at ebay.
Ed says
I assume the triplets will be close enough that 12 matched irfp240's are not necessary?
I think the thickness of the heatsink base plate is important, a thicker plate will spread the heat better and avoid local hot spots.Still looking at ebay.
Ed says
of Irfp240's
I assume the triplets will be close enough that 12 matched irfp240's are not necessary?
JFTR,
the heatsinks Bugg got for his Aleph/30 are not only great, but so cheap that i'm too damn jealous to be nice.
Even by the 6 in a cheap USPS Mondiale box, they'd cost me an additional $15/pc in mailing and dot-dot-dot taxes to buy them myself.
Bugg can expect 0.35 C/W at the least from a single one of his heatsinks, possible even a lot less if it's an efficient design. I hate you, Bugg.
the heatsinks Bugg got for his Aleph/30 are not only great, but so cheap that i'm too damn jealous to be nice.
Even by the 6 in a cheap USPS Mondiale box, they'd cost me an additional $15/pc in mailing and dot-dot-dot taxes to buy them myself.
Bugg can expect 0.35 C/W at the least from a single one of his heatsinks, possible even a lot less if it's an efficient design. I hate you, Bugg.
According to Rod Elliott's heatsink calculator spreadsheet they should do .39C/W. With only 2 fets on each one I would think this thing might almost be kid safe. I couldn't imagine finding anything this size for so cheap. They are used but the ones I got don't have any obvious scratches.
Don't worry Jacco my broccoli hates you too
~michael.
Don't worry Jacco my broccoli hates you too
~michael.
Less than a percent
Thanks Ed, I also will order those same parts
steenoe says
This would be a good way to spread the heat but will there be any performance change, perhaps speed and are additional parts needed to do this?
Digikey has the 3 watt panasonic .47r, part # is: PO.47W-3BK-ND, the no. will not work as a parts search, search this way in the parts window: panasonic .47, then scroll down to metal oxide[6] and you will find them .51 each or 5 for 2.38. At a certain order size, shipping is included[last time I did this]
steenoe says
This would be a good way to spread the heat but will there be any performance change, perhaps speed and are additional parts needed to do this?
Digikey has the 3 watt panasonic .47r, part # is: PO.47W-3BK-ND, the no. will not work as a parts search, search this way in the parts window: panasonic .47, then scroll down to metal oxide[6] and you will find them .51 each or 5 for 2.38. At a certain order size, shipping is included[last time I did this]
jacco vermeulen said:
hehe
look at these.......each capable of coolin' ~50W with 25 Celsius rise above room temp.......
on pic-middle row,most right-you see two white marks ....of 50W Golden Dales ,used for measuring;
I have 4 more ,not on pic,slightly taller........
these 14 + 4 cost me 90 bloody Euros at junkyard.........they even lowered Al prices later........I hate them!
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