Matriculation number: 0803879

Functional electrical stimulation (FES) is the stimulation of peripheral nerves on innervated paralysed muscle groups with the purpose of facilitating a functional movement. It is excercised in particularly to aid the rehabilitation of people with paraplegia. For that application, a low cost, portable, battery powered neuromuscular surface stimulation system was developed and implemented, which is capable of delivering high voltage, constant current controlled faradic pulse trains through surface electrodes. The stimulation waveform is exibly adjustable by the current amplitude ( 0-100 mA), the pulse width ( 40-500 µs), and the repetition frequency of pulses ( 25-300 Hz). These parameters can be remotely con gured from a personal computer over a wireless sub 1 GHz radio frequency link. The entire system consists of the stimulator board, an interface board responsible for the wireless transmission of commands from the PC, and the Matlab software which interacts with the operator through a graphical user interface. The stimulator is microcontroller based and the output stage consists of a minimalistic modi ed boost converter. Special e orts were made to optimise the device for low power consumption. Besides it's intended application eld the system is apt to be universally used for therapy and research. ii Content