a power supply conversion circuit converting {HEAD ~ a primary power supply voltage} into {TAIL ~ a secondary power supply voltage}, 
into
a power supply conversion circuit converting { HEAD ~ a primary power supply voltage } into { TAIL ~ a secondary power supply voltage } ,
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH