In SX Microcontrollers, SX/B Compiler and SX-Key Tool, George Herzog wrote:

If you are at all reluctant to directly connect the 16 volt DC, you can 'pre-regulate' it with a 7809.

In that way,
1/ You dump the heat via a regulating device that is off the board and may be sacraficed if you have the wrong hook up.
2/ You have a sure 9Volts to avoid confusion if you mix up power supplies or if you are trying to power a differenct set up that is less tolerant.

Other people think this is all silly, but...

Frankly, I have various Basic Stamps that I want to power directly and I have the SX-48/52 proto board. I also have a mix of other things which include some low drop-out regulators on homemade boards that cannot handle as high a voltage.  I also have the SX-28 board.

I jump in and out of projects all the time and may switch wall warts if someone gives me a freebie.

So this is my 'failsafe' set up.

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