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DATA_ENTRY

2016-10-11 13:50  
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DATA_ENTRY
Touch of operator's finger on input button produces CMOS output. Addition of one opamp section gives TTL output. Touch button can be 0.5-inch-square copper-clad pattern on printed-circuit board or machine-screw head having comparable area. For proper switching, circuit must connect to line-operated DC power supply.-R. D. Wood, Replace Bulky Mechanical Switches with Touch Controls, EDN Magazine, April 20, 1978, p 132-133.