Have you seen this post from July 1, 2008? How to make a digital clock: Picaxe
Well, the clock hasn’t work for a few months. When I plug it in and then unplug it, it shows a few random letters. Then it stops doing anything. Well, I figured that the display driver was broke since I noted it acted quirky in the first article almost two years ago. I was wrong.
It seems that we should always start at the wall and begin troubleshooting from there. Always. This is probably rule number 1. Well, it all boiled down to this: the original wall-wart shorted out and burned up. This leads us to the title.
Check out the new power plug. The original wall wart was a 6 volt output. I am now using a 9 volt output since the 7805 IC would prefer a little more voltage. I also did a current consumption test, and this circuit uses less tham 30mA. Now it can be unplugged and transported much easier.