The output signals from electronic circuits in suggested computerized systems can seldom be used directly to accomplish intended results in a vehicle. It is necessary to introduce a device that must transduce or amplify this signal as instructed by the electronic controls. These devices can be electromechanical, electromagnetic, or electrofluidic in nature. The intent of this paper is to describe these devices and their intended use in a system and to suggest criteria in order to select the proper device for desired results.
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