Many higher current switch designs rely on the separation arc to assist in dispersing contact corrosion.
2.
Some examples of an inherently digital input would be a 24 V DC / AC signal, current switch, an air flow switch, or a volta-free relay contact ( dry contact ).
3.
Although such dc currents are mostly dealt with after the fact using protective systems ( e . g ., low resistance bonds, reverse current switches, cathodic protection ), some of the protection has to be included at the manufacturing stage.
4.
Yourke's current switch was a differential amplifier whose input logic levels were different from the output logic levels . " In current mode operation, however, the output signal consists of voltage levels which vary about a reference level different from the input reference level . " In Yourke's design, the two logic reference levels differed by 3 volts.
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