Touch switch needs no dc return path


Posted on Nov 4, 2012

Common designs for touch switches detect a decrease in resistance when a user`s fingertip either connects a contact to the circuit`s common ground or supplies an injection of 60-Hz ac voltage, resulting from immersion in the electrostatic field that nearby power lines radiate. But what if no nearby power lines exist and the equipment operates from a battery source, such as in an automotive application, or if a galvanic contact to circuit common is unavailable?






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