[sdiy] Power Supply Design Questions

[Scott Gravenhorst]

Some questions I have:

At what input voltage should a LM78xx or LM79xx type
regulator be run for minimum heat?  

I read in data sheets that 2 volts is the usual value for
dropout voltage (at 1A).  

Would this be the point (well, somewhat above it) at which
the regulator would heat up the least?  

Operated so, does this also mean using a transformer with
better current capabilities?

Thanks all.

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