![]() ![]() Collector ( C ) Principle of operation of the two transistor types PNP and NPN.current regulating devices that control the amount of current flowing through themīJT Basic construction The BJT is a three terminal device that produce two PN junctions.p-type semiconductorsthe material lead to a deficiency of electrons and therefore an excess of positive charge carriers or “holes.”.n-type semiconductorsthe impurities result in an excess of electrons, or negative charges.which basically describes the physical arrangement of the P-type and N-type semiconductor materials. ![]() Two basic types of bipolar junction transistor construction,.If the transistor is a PNP, then the arrow points to the base of the transistor, otherwise it points to the output.The symbol of the transistor has an arrow on the emitter.Each transistor has 3 leads which we call base, collector and emitter, and we use the symbols b, c and e respectively.if the two materials are N and the middle one is P, then we have a N-P-N material or NPN. ![]()
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