To produce repetitive output ramp voltages, {HEAD ~ integrating capacitor} 45 is periodically discharged by {TAIL ~ a controllable switch} 56 
To produce repetitive output ramp voltages , { HEAD ~ integrating capacitor } 45 is periodically discharged by { TAIL ~ a controllable switch } 56
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH