Transistors can be used as amplifiers or switches. They come in NPN type and PNP type, because of this there is often to way of telling which wire is B,C or E.To find the B, C and E of a transistor, I can use the Diode test function on my multimeter to find which is which wire.
Transistor number
----Vbe Veb Vbc Vcb Vcb Vce
NPN 745 OL 742 OL OL OL
PNP OL 748 OL 742 OL OL
Good work
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