As we previously said, many electronic devices work perfectly even if the transistor is replaced with a similar device. Because of this, many magazines use the identification TUN and TUP in their schematics. These are general purpose transistors. TUN identifies a general purpose NPN transistor, and TUP is a general purpose PNP transistor. TUN = Transistor Universal NPN and TUP = Transistor Universal PNP. These transistors have following characteristics:
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