That's where using SMPS (Switched Mode Power Supplies) come into the picture so you can drop from 20V input down to a 5V output without using a commercial 150 ton AC unit to cool your regulator. If you need one take a look at this one. I'm sure it is capable of cooling your TO-220. ;-)pretty much installing an industrial air-conditioning unit and an extractor fan the size of a plane turbine just to use a TO-220 5V regulator dropping 10 to 14V in the lowest output setting (5V)
Some examples of experiments with SMPS gone wrong. (it's a joke)(a BJT or MOSFET and basically the 220V mains being chopped doesn't sound like a good combination to experiment with).
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