Abstract: A magnetic coil inductor for use in magnetic stimulators comprises two face-to-face electrically connected windings each having a multiplicity of turns of a respective conductor. Corresponding turns are separated by a gap which typically is of the order of 18 to 20% of the total height of the coil. The magnetic stimulator includes a discharge capacitor and a switch arrangement operable to provide discharge pulses at a selected repetition rate through the inductor, the inductor and the capacitor constituting a resonant circuit of which the resonant frequency is substantially in excess of the repetition rate and is typically between 2 and 6 kHz.

Abstract: A stimulating coil for use in apparatus for the magnetic stimulation of neuro-muscular tissue. having a ferromagnetic back disposed adjacent one broad side of the coil. the material of the ferromagnetic back exhibiting high permeability and high resistivity.

Abstract: A stimulating coil for use in apparatus for the magnetic stimulation of neuro-muscular tissue. having a ferromagnetic back disposed adjacent one broad side of the coil. the material of the ferromagnetic back exhibiting high permeability and high resistivity.

Abstract: A pulse circuit forms part of a radar transmitter in which a pulse forming network is used to generate a high current pulse at relatively low voltage and to feed it via a transformer to a magnetron which operates at typically 30 kV. A number of pulse forming networks are connected in parallel and are discharged by respective thyristors. The outputs of the pulse forming networks are combined so as to provide a low voltage pulse (of the order of 600 volts) having sufficient power to drive a radar transmitter. The pulse forming networks must each be capable of handling very large current and must have characteristics which are identical to each other. To enable these requirements to be met, each pulse forming network includes an inductor which is formed as a coiled thin conductive layer lying on the surface of an electrically insulating board. It is formed by printed circuit board techniques and a mirror image coil is formed on both sides of a double sided printed circuit board.