Gnublin

Gnublin:
The Gnublin board is a small form factor PCB with an embedded Linux on it. It can be bought on embedded-projects.net.

Picture of the Gnublin board:

Gnublin board with a Wifi dongle and battery:

Gnublin board connected to a STK-500:

7-Segment display attached to the Gnublin board:

platine_port

Gnublin board with a DCF-77 reciefer:

DCF-77 high signal:

DCF-77 low signal:

Kernel configuration:

linux_kernel_configuration

Schematics of the soundcard:

schaltplan

Soundcard PCB design:

Etched PCB:

platine_gebohrt_bottom

Drill the wholes:

Manufactured PCB:

platine_gebohrt_top

Fully assembled PCB:

Theory of the signal:

Signal on an oscilloscope (PWM):

Setup of the soundcard:

platine_pwm