MikeK, usually when I try to build something electronic it doesn't work after I am finished. Maybe too much heat when soldering, a backward diode, other stupid mistakes too. I sometimes have parts left over because I have to buy a pack of 4 at Radio Shack. And it takes way too much time when I do it. And when it doesn't work I have no idea what went wrong. But it is fun. Then I go out and just buy the expensive version!
