Magnetic stimulation coil and circuit design

A detailed analysis of the membrane voltage rise commensurate with the elec trical charging circuit of a typical magnetic stimulator is presented. The analysis shows how the membrane voltage is linked to the energy, reluctance , and resonant frequency of the electrical charging circuit. There is an op timum resonant frequency for any nerve membrane depending on its capacitive time constant. The analysis also shows why a larger membrane voltage will be registered on the second phase of a biphasic pulse excitation [1], Typic al constraints on three key quantities voltage, current, and silicone contr olled rectifier (SCR) switching time dictate key components such as capacit ance, inductance, and choice of turns.