I have 2 heatsinks that are 190mm x 140mm x 57mm (L x H x D)
The fins are 50mm deep & base plate is 7mm thick. Fin spacing is 10mm.
Are these good for the ACA.? I want to use parts I have on hand if possible.
Next question. If the above is good, could the sinks be cut in half (height wise) to obtain 2 x 190mm x 70 mm x 57mm sinks and still be enough sink for the ACA boards.?
Thanks for the help.
MM
The fins are 50mm deep & base plate is 7mm thick. Fin spacing is 10mm.
Are these good for the ACA.? I want to use parts I have on hand if possible.
Next question. If the above is good, could the sinks be cut in half (height wise) to obtain 2 x 190mm x 70 mm x 57mm sinks and still be enough sink for the ACA boards.?
Thanks for the help.
MM
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My ACAs have been built with sinks that are 220mm wide by 80mm tall with fins that are about 40mm deep. This is just about perfect for one channel of ACA. What you have is a bit larger than this and sounds like it would work well for one channel. Cutting this sink in half sounds to me like it would be too small.
As Zen says, an image would help.
As Zen says, an image would help.
Add fans if one is all you have
If you only have one and one is all you can get you can add computer fans if that is available to you.
When I was Proto typing my very first amp camp amp With no heat sinks and no chassis only a handful of parts on a Breadboard. At that time I only had available to me for small heat sinks that I stripped off a power supply that only measured W1” X D1” X H8” When I first turned it on they started getting hot pretty fast and burning hot after a few. I added a computer fan blowing up words through the fins with the heat sinks standing vertical after that temperature was not a problem you could hold your fingers on it all day long.
If it’s all you have for now and it’s all you can get for a little while why not enjoy and by reducing the voltage on the computer fan you can see what you can get away with a ratio of quietness with slower fan speed to temperature how much air you need to blow across the heat sink fins to satisfy temperature.
If you only have one and one is all you can get you can add computer fans if that is available to you.
When I was Proto typing my very first amp camp amp With no heat sinks and no chassis only a handful of parts on a Breadboard. At that time I only had available to me for small heat sinks that I stripped off a power supply that only measured W1” X D1” X H8” When I first turned it on they started getting hot pretty fast and burning hot after a few. I added a computer fan blowing up words through the fins with the heat sinks standing vertical after that temperature was not a problem you could hold your fingers on it all day long.
If it’s all you have for now and it’s all you can get for a little while why not enjoy and by reducing the voltage on the computer fan you can see what you can get away with a ratio of quietness with slower fan speed to temperature how much air you need to blow across the heat sink fins to satisfy temperature.
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Thanks for the reply TAlch. I have 2 of these, that is why I thought I could use 1 per channel. I looked on the heatsink data page in the store, and I estimate the sinks would have a thermai coefficient of .35 C/W - .45C/W, depending on full size sink or chopped in half. Fans might be possible. I will wait and see what other members chime in with.
I have some cpu sinks that require fans, but they are good for about 130W of dissipation each, and the power fets on the boards are far enough away from each other, that I would have to use 2 cpu sinks for each channel, which I do not want to do. I could use 1 cpu heatsink for both channels if I used short flying leads to the pcb boards, not sure if that is a good option or not.
I also have some gainclone builds that I will use as practice building before I build the ACA, so I think I can use the sinks for them. Seems like there is always options!!!
Regards
I have some cpu sinks that require fans, but they are good for about 130W of dissipation each, and the power fets on the boards are far enough away from each other, that I would have to use 2 cpu sinks for each channel, which I do not want to do. I could use 1 cpu heatsink for both channels if I used short flying leads to the pcb boards, not sure if that is a good option or not.
I also have some gainclone builds that I will use as practice building before I build the ACA, so I think I can use the sinks for them. Seems like there is always options!!!
Regards
Those look perfect to me. I wouldn't cut them in half, like you asked, but whole, they should do the job very well. Just my .02 cents worth.
The Full kit from the shop has 40x80x200mm heatsinks and get hot enough that you wouldn't want to leave your hand there for too long after a long listening session on a hot day. No an instant burn but a bigger heatsink would be an advantage. I you have any thoughts about upping the voltages as some people on the forum have then you'll be one step ahead.
Thanks Steve. Good point about increasing the voltage. My proposed sink is 57mm x 140mm x 190mm. This makes it a bit longer in the fin area, 1.75 times as wide, and 10mm shorter than the stock sink. I would think this would be an advantage especially if upping the voltage. Can you recall what size of sink builders are using for the higher voltage.?
Waiting to hear from ZM, Eric, and Tony Tecson whom requested the images.
Regards
Waiting to hear from ZM, Eric, and Tony Tecson whom requested the images.
Regards
yes to this....i am using a conrad engineering MF35 heatsink for my 48v ACA, two channels in a single sink...