{TAIL ~ Two operational amplifiers} 68 and 70 form part of circuit 50 with {HEAD ~ inverting terminal} 72 of op amp 68 common with anode 54 of photodiode 52 
{ TAIL ~ Two operational amplifiers } 68 and 70 form part of circuit 50 with { HEAD ~ inverting terminal } 72 of op amp 68 common with anode 54 of photodiode 52
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