A unitized cage for cylindrical roller bearings wherein the inner raceway of the bearing configuration may be the rotating or stationary shaft component and the outer raceway of the bearing configuration may be the rotating or stationary housing component. The support member includes a plurality of protrusions that correspond to a series of fastening apertures formed in the baking sheet. The present invention also relates to a door having the disclosed wood composite door facings, and methods of forming the facing and door. This not only reduces the costs of the system by reducing the number of sensors, but also permits adjustments to be made more rapidly. The variability in the output current provided by the current-source circuit allows the drive circuits to optimize the control current flowing into the switch device as the characteristics of the switch device change with operating temperature.