Abstract: A coil is inherently aligned with the open face of a cup core and prevented from recessing into the core upon assembly of the coil and core into a housing by placing a resilient foam washer within the core under the coil to cause the coil to normally extend beyond the open face of the core and subsequently securing the subassembled core and coil pressed against a common internal surface of the housing, compressing the foam washer. Internal tabs on the foam washer are compressed between the center boss of the cup core and the internal surfaces of the coil opening to retain the coil assembled to the core as a separate subassembly.

Abstract: A sensor is provided for changing an operational characteristic of a circuit within a housing structure of the sensor to a preselected stimulus. The circuit within the housing structure is provided with magnetically sensitive components to change an operational parameter thereof. An object is provided to change the status of the magnetically sensitive component. The present invention incorporates a Hall effect element within the housing structure that is placed proximate a permanent magnet. Between the magnet and the Hall effect element a depression is formed to permit the insertion of a magnetically permeable object to change the magnetic field. The change in the magnetic field creates a change in the status of the Hall effect element and permits the circuit to change its operational characteristic.