Abstract: A heat sink assembly to remove heat from electrical components mounted on a circuit board is disclosed. The assembly contains a housing that is formed from a suitable heat sinking material and is appropriate for receiving a circuit board with surface mounted electrical components. The invention provides an improved apparatus for establishing thermal contact from a heat generating, surface mounted electrical component to the housing. A resilient biasing element is fixed in relation to the circuit board and the housing in order to urge the circuit board with a plurality of surface mounted electrical components in thermal contact with the housing. Once the heat sink is assembled the invention provides various means for which heat can be readily transferred from the electrical components to the housing.

Abstract: An electronic fuel injector driver circuit is a high speed operator of electromagnetic fuel injector valves for internal combustion engine. The drive circuit includes a solenoid coil for each electromagnetic fuel injector. A one shot timer circuit sends a predetermined timing signal to a first controller circuit interconnecting the one shot timer circuit and the solenoid coil wherein the predetermined timing signal is used to control the high side of the solenoid coil. A second controller circuit is connected to the solenoid coil and controls the low side of the solenoid coil in response to the predetermined timing signal. A switchable voltage reference circuit is connected to the second controller circuit and controls current through the solenoid coil.

Abstract: An electronic oil pressure transducer circuit interfaces a piezoresistive pressure sensor to magnetic needle movement and lamp or electronic instrument control computer for reliable automotive engine oil pressure instrumentation. Circuit design uses standard components suited for automotive under-hood environment. Calibration is performed at the design level, eliminating the need for expensive on-line procedures. Circuit assembly is designed for automated, high-volume production.