"I normally use a USB port as power supply for my projects but some ICs need 3.3V instead of 5V. Therefore I decided to build this small dual power supply. Power supply uses two low dropout voltage regulators that provide up to 800mA of output current and come in TO-220 package. LD1117V33 is used for 3.3V and LD1117V50 for 5V. Input voltage is 6V-15V and both regulators can be switched on/off individually.
I've tried to keep the board as small as possible. The problem is, that I don't have the possibility to etch PCBs. The board is designed to be soldered by hand and routed with wires. Using etching methods and conductor paths would make the board even smaller, but I think it's pretty handy."