Take a step up

For a little nightflight-illumination-project I needed a small 12V DC-to-DC step up converter. I searched and found one on ebay for about $13 including shipping. Not that bad a price, considering the shipping from the USA, but looking at Wikipedia, it turns out, that these devices are in fact dead simple. So:  Tiny25 + transistor + diode + inductor + elkos = step-up-converter. But, having a tiny on the board you can do some fancy stuff. Here is my design; 40mm x 27mm with regulated and adjustable output voltage, STABLE-output or ENABLE-input and I2C interface.

I’ll supply the design files as soon as there is source code and it turns out the baby actually works.

Please note that the PCB Design and schematic are released under a CC-BY-3.0 license.