This simple PCB can be used if you have 5V Atmel programmer and you want program 3.3V device.
This board have also LF33 linear stabilizer so you can power your target board too. It’s a bit older design where are missing capacitors. This was designed to use parts I already had at home. Today I would use proper level shifter. But it did its job perfectly fine.
The traces are curved just because I wanted.. for fun :)