Quote:
There is a 12V line already on the serial port. It's switched with the display. Take that, fuse it at 250mA, and use a 7808 regulator and two capacitors. You'll need to heatsink the regulator to handle 400mW.

Bumping an old thread...

I've picked up a Garmin GPS 18 LVC, which needs 5VDC. So, I'm in the same boat as the OP, but with hardly any circuit expertise.

I searched Radio Shack's website for a 7808, and only came up with a 7805. Is this the right one? If I go into a B&M Rat Shack and ask for a 250mA fuse, 400mW heatsink, and pair of caps (specs?) would I be set?
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