The signal supplied to {TAIL ~ the light intensity control circuit D} is derived from {HEAD ~ the adder} 9 
The signal supplied to { TAIL ~ the light intensity control circuit D } is derived from { HEAD ~ the adder } 9
OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH