Actually I see some problems with the selection of components in Olin's
schematics. Maybe they are not a big problem for hobbyists though.

1) Voltage rating of C1/C2/C3 is only 35V. This may be a bit low if the
input voltage is really 30V with big ripples.

Actually the better "solution" is not to specifiy the circuit to be 11-30V. ;-)

2) I'd like to see a fuse in the input and a zener (over voltage
protection) after
the buck converter to protect the other parts.

3) As Russel said, normally there will be a small series gate resistor is
good to have.

Regards,
Xiaofan

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