Looking to output different types of signals to design, test and troubleshoot your electronics? Try out the function generator at Sears think[box]. Bring your electronics to Floor 3 of Sears think[box ...
Testing a regulator all the way down to zero volts to see how it behaves and finding an output level, below which bad things ...
Obviously a FG-100 (ebay is a good source) ATMega328p 28pin DIP microcontroller AVR programmer/ISP (the Makefile defaults to using a USBTiny ISP) AVR toolchain (eg avr-gcc, avrdude and gnumake) ...