Originally Posted by Fred_fred2004
Yes you're spot on, the heatsinks are held by the mosfets, thats why you can see fibre washers under them to insulate from the tracks.
My thinking was that I will have to air wire them to the outside of a case, rather than board mounted
I'm using IRF610's and they are good from -55 to 175 degrees C according to my home made temp probe the heatsinks are sitting on 71 degrees so certainly hot but well within specs, I'm not using any paste just a good tight fit. If I use a Hammond case I may just bolt them to the metal sides that'll keep them happy
Clever thinking using fiber washers to insulate the heatsinks.
If you wire the heatsinks outside of the case don't forget to move the gate stopper resistors (R3 & R9) too.
I'm sure the 610's can stand the heat but wow, 71°C! That's HOT!