Abstract: A high voltage/high current circuitry includes a push-pull voltage amplification stage connected in tandem with a parallel connected push-pull current amplification stage. For the voltage amplification stage a pair of bipolar operational amplifiers are connected in parallel and operate in a push-pull manner. A pair of switching means are positioned at the output of each of the bipolar operational amplifiers while the outputs of the amplifiers are connected to the inputs through a current gain regulating means, an isolation means and a voltage divider means.

Abstract: The output voltage of a transformer is regulated by controlling the flow of magnetic flux through a shunt core. The transformer includes a main core fabricated from U-I laminations and is arranged to form a substantially rectangular structure. A primary and a secondary coil are seated on the main core. A shunt core with shunt winding having lamination size and structure substantially analogous to that of the main core is positioned in spaced alignment to said main core. A flux interconnecting path, called the bottleneck, connects the main core and the shunt core to form a sturdy unified structure. The shunt winding is activated by control circuitry by which the flux flow through the shunt core is limited and hence the output voltage is regulated.

Abstract: In a flexible magnetic disk file having one or more flexible disks mounted for rotation about a centrally located axis, data on a selected disk is transduced by a magnetic head seated on a fail-safe head arm support. The head arm support is a relatively flat elongated member mounted at one end to a carriage assembly. The head arm support has a smooth contour with relatively sharp edges about its periphery and a spherical enclosure seated on its free end. The head arm support is tapered, at a predetermined angle from the rigidly mounted end towards the free end. The angle of taper allows for automatic ejection of the head arm support from the disk file during inadvertent closure of the disk file. The relatively sharp edges allow the head arm support to open a closed disk file.