The second output terminal 131 of the microprocessor 13 is connected to {HEAD ~ a base electrode} of {TAIL ~ the sixth transistor} 144 via a diode  
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The second output terminal 131 of the microprocessor 13 is connected to { HEAD ~ a base electrode } of { TAIL ~ the sixth transistor } 144 via a diode
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH