{HEAD ~ The comparator circuit} controls {TAIL ~ the lighting} of a go/no go indicator LED, which tells the operator which side of the readhead is more sensitive to the magnetic flux 
{ HEAD ~ The comparator circuit } controls { TAIL ~ the lighting } of a go / no go indicator LED , which tells the operator which side of the readhead is more sensitive to the magnetic flux
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH