| http://www.w3.org/ns/prov#value | - The phototransistor of the photocoupler PC is controlled of the conduction as a function of the intensity of the light emission from a light source such as a light emitting diode which is energized by the output from the comparator PC. When the rectified output from the rectifying and smoothing circuit 4 exceeds a predetermined reference level REF, the comparator provides a corresponding output to
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