I've got a 7805CT regulator running off a 11.1V lipo (yes, I know it's a big voltage difference). The 7805 is powering a PICAXE, two Maxbotix EZ4 sonars, the logic voltage for a L293N, and it's giving high voltage to the '293s enable lines. When only the PICAXE and EZ4s are plugged in I get 3.3V. When the '293 is plugged in I get just over 2V and the EZ4 readings cut out.
This doesn't seem right. The regulator doesn't even get warm. Shouldn't I be able to squeeze around an amp out of this thing? I'm puzzled.