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