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