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