Hi - I just "finished" soldering my $50 robot, for the most part. Earlier I accidentally put in the voltage regulator in backwards, and decided to desolder it, pull it out, and put it in again. Unlike the other few other places where I was using desoldering braid to great effect, it took a lot of frustrating fiddling to get the solder off the 3 pins (I assume because of the heat sink built into the chip). When I went to pull it out, the heat sink was very hot. Not hotter than boiling - I touched a damp sponge to it and it didn't hiss - but quite hot.
I hear those ICs are very easy to mess up if you heat it up too much with the iron. What are the chances I fried something in there?
The reason I am concerned is while doing my connectivity test I noticed that I have non-infinite resistance across any two of the voltage regulator pins (e.g. ground to input, input to output, ground to output). The multimeter moves around when I measure resistance, but it kind of homes in around 240ohm if I measure resistance across Ground and Input. Then it occurred to me that I have no idea what resistance it should read anyways, so I have no way of telling if it's busted or not.
I have not yet attached any servos or anything - I've essentially finished step 3B and am doing the connectivity test of step 3C.