DL7AOT Rotor controler
Goetz Romahn's DL7AOT put together this design that saw some great adaptations from many hams around the world. This very simple design was made to help Hams satellite users and HRPTusers track there target at a low cost. Compatible with GS232/GS23 (Easycomm) protocol it opens the door to many softwares that are compatible with this very common rotor controle protocol marketed by Kempro/Yaesu rotors.
This is his original drawings for the controller