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we also use less than 10% of our brain capacity -- so the people who are using 100% are unable to learn new languages or use online translators or find their local city library and if they accidentally do their unable to order misc. dictionaries ...We speak English here. Your links had languages I never heard before and one was a horrible translation: "When first installed heatsink on the release point in TDA2822M. Use the thin Bangzha to bear."
for a starting EE the class D circuit setup would be a way higher challenge -- besides if you don't push the old chip to it's limits it won't get hot but is able to play audible sound on spk. -- i have considered using such old power amp.-s to replace piezo tweeters on PC MB-s or to set up for night time listening (misc. noise regulations) e.g. the applications that are to be moderate or quietI think the old obsolete TDA2822M should be buried and a modern class-D amplifier should be used instead since it does not get hot.