Abstract: An integral biomolecule preparation device which accomplishes all of the nucleic acid separation steps, including centrifugation, reagent addition, and pipeting, automatically without human intervention to fully automate the DNA separation procedure.

Abstract: An adjustable tape head mounting mechanism includes a housing for engaging the tape, and comprises structure for supporting the head housing relative to a head carriage at at least three spaced positions on the housing for head adjustment.

Abstract: An improved control is provided for the tape transport motor of a battery-powered, slow-speed tape recorder typically used for producing magnetic recordings of an ambulatory patient. The recorder's tape transport means is driven by a synchronous AC motor powered from a DC (battery) supply. That DC supply, during normal operation, is voltage regulated to provide desired speed stability. That DC supply is inverted into a square wave DC current in a manner effectively providing a regulated square wave AC at twice the regulated DC voltage. Phase-shifting means connected to the inverter provide a phase-shifted square wave source necessary for the two-phase AC synchronous motor. In an improved mode of control, means are additionally provided for selectively supplying current at full battery voltage, square wave inverted and phase-shifted to the AC synchronous motor in lieu of the regulated supply voltage to provide high torque operation for selected periods of time as during "start-up" or "warm-up".