A generally rectangular housing base or body portion has an upward-opening central cavity and mounting ears extending from each corner. A wiring board on which electronic circuit components are mounted is supported in the cavity of the base. Each end portion of the wiring board extends from the cavity between two of the mounting ears. The top of the cavity is closed by a lid to enclose the circuit components. The opposite ends of the wiring board projecting from the housing cavity are adapted for connection of different pin or stud terminal connectors so that the housing-board unit is capable of being easily joined to or arranged with other electrical parts or units.