Yes - that would work - but you have other problems.
The transistor will be dropping (9-3.3) = 5.7V at up to 100mA. This is
0.57W & too much for a single 2N2222 (or most similar sized units).

Either parallel a number of 2N2222s (at least 3) and add current sharing
resistors in their emmitter circuit, or use a bigger transistor (e.g a
TO220 Darlington) or use a 3 terminal reg as someone else suggested. You
could use a bit of cpacitance on the input & output also .

Or use a switcher  such as roman blacks' simple circuit.
(http://www.romanblack.com)


Richard P




as an after thought - if I put a diode between the zener and ground to
raise
the zener's ground reference about 0.6V, I can offset the voltage drop
across the transistor to get a voltage closer to the zener's - right?


-Clayton

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