I have messing around with LM1117. From my experience
it is a good regulator. The thing I like about it is
the voltage regulation. When the circuit is open the
voltage reads 5.00volts. When I place the load which
is a PIC with blinking led the voltage drops only to
4.99 volts*with voltage input ranging from 9v to
18volts!*. This is remarkable to my standards. So my
question is, can we build a voltage regulator with
such good voltage regulation? I have been playing with
zeners and diodes and managed to get a +- 0.05 volts
with load and varies voltage input*9 volts to 18
volts*. 

Thanks,
John

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