the second power supply supplies a second power supply voltage obtained by adding a voltage corresponding to {HEAD ~ a forward voltage drop} of {TAIL ~ the second and fourth diodes} to the second predetermined voltage 
of
the second power supply supplies a second power supply voltage obtained by adding a voltage corresponding to { HEAD ~ a forward voltage drop } of { TAIL ~ the second and fourth diodes } to the second predetermined voltage
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH