Ntho e ikhethang ea potoloho ea amplifier e bulehileng (OC heke) ea NPN le PNP: tlhahiso ea switching ea amplifier ea saturation.

Open collector ke ts'ebeliso e khethehileng ea potoloho ea amplifier ea triode. Moqokeleli oa C o behiloe boemong bo phahameng, 'me emitter ea E e behoa boemong bo tlaase. Ha setsi sa B se romela lets'oao le lenyane, lets'oao la ho fetoha le matlafalitsoeng le felletseng le hlahisoa ho mokelli, e leng "1" ho potoloho ea dijithale. Potoloho e bulehileng ea amplifier ka linako tse ling e bitsoa heke ea OC.

Lefapheng la li-automation, "PNP" le "NPN" li hlalositsoe ka ho toba e le pontšo ea pontšo ea PNP e bulehileng ea pokello ea amplifier ea potoloho le tlhahiso ea potoloho ea NPN e bulehileng ea mokelli oa amplifier.

Terminal e tloaelehileng ea phepelo ea motlakase le lets'oao la pokello e bulehileng ea PNP e maemong a tlase, e boetse e bitsoa cathode e tloaelehileng.

Sesebelisoa sa motlakase le sesupo se tloaelehileng sa "mokelli ea bulehileng oa NPN" li maemong a holimo, ao hape a bitsoang anode e tloaelehileng.

Ka lebaka la phapang ea tataiso ea phallo ea pontšo le mokhoa o tloaelehileng oa ho kopanya li-terminal, pontšo ea PNP le letšoao la NPN le tsona li lokela ho lumellana le polarity ea potoloho e amohelehang e amohelang, ke hore, PNP e amohelang potoloho e amohela pontšo ea PNP le NPN e amohelang potoloho e amohela letšoao la NPN.

Mofuta oa mohloli le mofuta oa drain ke khutsufatso ea "source amplifier circuit" le "drain amplifier circuit", e leng pono e amanang le tsela ea hona joale ea phallo ea amplifier ea mats'oao.

Potoloho ea "mokelli" e bulehileng ea triode e romela lets'oao le lenyane, le phahamisoang ho lets'oao le fetohang hore le tsoe ho mokelli, le lumellanang le sensor e utloang lets'oao la 'mele ebe e ntša lets'oao le fetohang. Ka hona, li-sensor tse ngata li khetha mofuta ona oa mofuta o bulehileng oa pokello ea NPN le PNP. Phallo ea pulse ea encoder e ntseng e eketseha e boetse ke phetoho ea sekhahla se phahameng le se tlase, kahoo li-encoder tse ngata tsa pele tse ntseng li eketseha le tsona li khethile mofuta ona o bulehileng oa pokello ea NPN le PNP.