Homebrew PCBs

I've just uploaded the simple mcu schematic - just an ATtiny13, a 
resistor, a diode, and a bypass cap. Add an external switch for 
single sided boards or an optical sensor for double sided boards. The 
biggest problem was finding a good 5 volt supply! I finally realized 
that the Centronics parallel printer port has a 5 volt supply pin 
that is guaranteed for 50 ma. Perfect!

Mark