a third diode having a characteristic comparable with the characteristic of {TAIL ~ the first diode}, and disposed in series between the first power supply and {HEAD ~ the first device} having a direction from the first power supply towards the first device as a forward direction, and 
a third diode having a characteristic comparable with the characteristic of { TAIL ~ the first diode } , and disposed in series between the first power supply and { HEAD ~ the first device } having a direction from the first power supply towards the first device as a forward direction , and
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH