There was a small project with the L7805cv 5V regulator This chip is not really known for its efficiency, so that it feels hot even at a few milliamps. This radiator seemed like the best option. The processing quality is good, can be tightened well. Some have mentioned that this doesn't work with breadboards, I couldn't remove the support pin but I was able to bend it. This makes it suitable for prototyping and possibly PCB if you can't fit in the pinhole.
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