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Originally Posted by ezkcdude
Here's another enigma. How does one go about determining if the regs or other components are getting too hot? I certainly don't think the "finger touching" method is a good idea.
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Why not, burn your finger, too hot

Although yeah it would be a problem if the tab of your regulator or transistor sits high than 50V, if you aren't careful and provide a path to ground that is. If you use silicon or a different isolator between the part and the heatsink like I often do than this isn't a problem.
I use the KProbe on my multimetre to take a temperature reading.