a transistor having {HEAD ~ a base terminal} connected to the microprocessor, a collector terminal and an emitter terminal connected to {TAIL ~ ground}; and 
a transistor having { HEAD ~ a base terminal } connected to the microprocessor , a collector terminal and an emitter terminal connected to { TAIL ~ ground } ; and
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH