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