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The heat does get out. The reason I added the larger aluminum block that directly contacts the case is so that the inside doesn't have to get hot and heat up all of the other components like the electrolytic caps. I did the same thing on my DIY outdoor AVR that has 5.1 processing and 5...

For me the block just had to be 1" tall... I had some 1x1.5" stock from another project so I cut it to fit in the case and drilled two holes and mounted it. I would recommend a 1x1" block because it was a bit close to the caps on each side don't drill quite right it could touch. I then just...

Instead of drilling has anyone tried using a block of aluminum(solid or square tube), or a heat sink on its side that connects directly from the chip to the case? If the tolerance is right it could touch directly and transfer heat to the case via some thermal paste. A finned heat sink could...