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