I'm gearing up for my second TTL project. One of the issues that bugged me before was power. I had taken a nine (sorta) volt wall wart and ran it through a DM317 to get regulated 5 volts. Never really liked this since it put out a lot of heat, made the heat sink really warm. This time I was thinking that since USB is 5 volt that might be an option. I have an apple iPad charging thingy and it puts out about 5.1V (no load) with up to 2.1A output. That's plenty of amps but I wonder about the voltage regulation. Will this be OK? Sure would be convenient. Thanks for any thoughts.