Electronics > Projects, Designs, and Technical Stuff

DC load using a CPU cooler

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SeanB:
My bad, I was thinking of regular CPU heatsinks, that have a flat bottom that is actually large enough to have the 3 rows of 3 TO247 devices on the bottom. You might have the one edge not in contact on the outside, but the surface would do 9 tightly packed. Those copper rods are going to make poor contact, so you probably want the 3mm copper plate, machine it smooth on the faces and use the thermal epoxy to hold it and the devices together. You will not get good contact onto those flattened pipes without thermal epoxy or a good thermpad.

microbug:
Can one get pre-machined copper plates? I don't have access to a CNC mill

rob77:

--- Quote from: microbug on September 20, 2014, 02:24:14 pm ---Can one get pre-machined copper plates? I don't have access to a CNC mill

--- End quote ---

you don't need a CNC mill to flatten the surface ;) people were flattening metal surfaces on milling machines before computer control was invented ;) i bet you have a tons of small businesses or even individuals with a milling machine in your area... for few bucks they'll flatten the block for you.

SeanB:
Cut to size, use a file on the edges and make flat with a flat surface and sandpaper. Flat surface can be a surface block, a granite kitchen top or a sheet of thick glass.

timb:
As luck would have it, I just got a nice mill! I could make some copper pads for you, it would be good practice!


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