Abstract: An apparatus featuring a suction head assembly for transferring a set of chips from a template assembly to a printed circuit board. In order to make the suction head assembly readily adaptable for mounting the chips in any of numerous different arrangements on circuit boards, a planar head carrier is provided which has a multiplicity of mounting holes formed therein in columns and rows. A set of suction heads can be mounted to the head carrier in any desired arrangement, corresponding to the desired chip arrangement on the circuit board, by having their holders removably engaged in selected ones of the array of mounting holes in the head carrier. The template assembly is likewise made adaptable for a variety of chip arrangements, by having a set of open-top positioning vessels removably engaged in selected ones of an array of mounting holes formed in a template.

Abstract: In order to minimize the effects of heating on performance and reliability in a phase change ink jet system, the ink jets comprise a material having a thermal conductivity of at least 0.03 g cal/sec cm.sup.2 (.degree.C./cm). The material may comprise stainless steel or aluminum. The reservoir of the system comprises the same material.

Abstract: A low ripple high voltage power supply is disclosed for use in a dental X-ray system, utilizing a rectifier and regulator circuit to provide a low voltage regulated DC signal, a DC-AC converter for providing a high frequency chopped power signal suitable for efficient transformation to a high voltage, followed by a multiplier for generating the final high voltage signal to be applied to the X-ray tube. A high frequency clock circuit is used for driving the converter and also for controlling logic circuitry used to develop the regulator control signals. Both a voltage and a current control loop are utilized in the regulator control, and the tube anode current and filament current are controlled as a function of sensed anode current.