determine transistor 's pins
Try to imagine that if the type of it is NPN.it can be show like picture below.
use VOM(choose ohmmeter mode and choose (Rx1 scale).not using DVM.This way is only right in case U use VOM to test.
place randomly 2 prop of VOM on 2pin of 3 pin of transistor.then you change position of two prop(ex: first red pro is position 1 , black prop is position 2 then red pro is position 2 , black prop is position 1).After 2 times change position on of Prop, If R mesured result is infinity or nearby it then TWO pin of that couple is CE. and We determine the other pin is Base.
Then we determine where is C and where is E
Place black prop on BASE, and red prop on other pin(C or E).If bolth cases( prop plce on E , and prop place on C) the mesured result is infinity or nearby it
that transistor type PNP.Else If it type NPN.
IF type is NPN(place black prop on BASE) or type is PNP(place red prop on BASE).and place other Prop on one other pin.If the result mesured is not infinity or nearby infinity that pin prop place on is E , and the other pin is C.
note that between B and E is one Zener diode , and between B and C is normal diode.
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