Abstract: A portable work center is a self-contained, electronic, electro-mechanical, ench top work unit used in the servicing of electronic circuits and specifically printed circuit boards. Solder iron temperature adjust control functions, a continuously variable vacuum or pressure control function, a mechanical rotary drive power control function, low voltage hand tool power supply function, and alternate foot switch control unit, a digital display input for control and function selection, digital displays of status, solid state control logic circuit for operation, and auxiliary control power outlets are integrally contained in the unit to provide for in situ servicing of printed circuit boards.

Abstract: An energy-saving device in the controlof an induction motor which keeps the power factor to a desirable value, regardless of load and line voltage variations, by switching off the voltage applied to the motor during each cycle for a period of time in response to the phase lag between current and voltage. An automatic timing circuit provides for the application of maximum power during motor starting and quick response upon sudden changes in load conditions.