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Help with Transistor testing

Discussion in 'General Electronics Discussion' started by Jake_Rezac, Feb 26, 2015.

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  1. Jake_Rezac


    Feb 26, 2015
    Ive been trying to make some simple circuits at home and have been harvesting transistors from old appliances to do so. Ive looked up tutorials on how to test these transistors and found that a measure of resistance should be returned on a multimeter when the positive probe is on the base and negative probe is on either of the other leads of an NPN transistor. However, all of the measurements only return a resistance reading when the negative probe is on one of the leads. I cant even find which pin is the emmitter and which is the collector on the data sheet. This has been happening with the utc tl431 transistor. Is this transistor still good? what am I doing wrong?
  2. BobK


    Jan 5, 2010
    Does you multimeter have a diode setting?

  3. Arouse1973

    Arouse1973 Adam

    Dec 18, 2013
    Hello Jake
    The TL431 is a shunt regulator not a transistor
    BobK likes this.
  4. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    Jan 21, 2010
    Jake, it's always a good idea to google for the part number that appears on a salvaged device such as this.

    In this case you would have discovered datasheets, circuits, etc showing you all you need to know. Of course you may not understand it all, but we could help you with that :)
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