{TAIL ~ Each current control stage} includes an operational amplifier , a pass transistor , {HEAD ~ a sense resistor} , and a feedback resistor  
{ TAIL ~ Each current control stage } includes an operational amplifier , a pass transistor , { HEAD ~ a sense resistor } , and a feedback resistor
TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH