On Sat, Apr 12, 2008 at 11:50 AM, Bob Axtell wrote: > Why not use a 7805/TO220 in the automotive environment? All you need to > do is install the > recommended caps, but also install a TVS or varistor on the input to > protect from ESD spiking. > The LM7805 is very forgiving, and not as cranky as the LM2940. I use 'em > all over the place. Hm...good points, same with Matt's post. I think I'm going to use an LM1117T for my first test and then try to scope the power lines and see if the radio is actually regulating its output. Thanks! Josh -- A common mistake that people make when trying to design something completely foolproof is to underestimate the ingenuity of complete fools. -Douglas Adams -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist