We develop custom PCBs for the integration in mechanical systems, e.g. for direct control of actuators, sensors or servo systems. Standard components are 8-/32-bit microcontroller by Atmel and ST, also FPGAs and CPLDs by Xilinx and fieldbus systems such as Profibus, DeviceNet, AS-interface and EtherCAT. Our preferred electronics design tool is Altium Designer 15 featuring integrated circuit simulation for analog and digital signals at frequencies of up to 5 GHz on multilayer boards. Altium also generates complete mechanical and thermal models of the PCB, which we can use in further simulations.