An electronic circuit including a plurality of DA converters is operated to provide uniform outputs from the DA converters even if the DA converters have different levels of offset values by providing each DA converter with a memory for offset correction digital data and an adder for adding the offset correction digital data to a digital input signal to the DA converter. A length of wire is wound on the hub to form a coil positioned between the first wall and the second wall of the spool. The over-center mechanism comprises a one or two-piece shaped element which defines a plurality of operating characteristics of the operating member, and which has a second depth which is less than about 25 percent of the first depth of the housing.