STK 200 (FREE avr programmer / downloader)

i used this one, is simple, easy to build & cheap. no need any microcontroller. this is the schematic
i got it from this site

it`s connected to parallel port on your computer and also need supply voltage 5 volt and ground of course. There r three important line that must be connected between the parallel port (centronics) to your microcontroller unit (MCU), and that are MOSI MISO and SCK. Each type of MCU have a different pin configuration so u need to see the datasheet. This is my STK200

i have no trouble when i built this, its amazed me somehow, coz usually there is always some little mistake that i made when i build something, but not this one.
if u wanna build with USB connection, visit this site