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Hfe of transistor in circuit

Discussion in 'General Electronics Discussion' started by CALCOM, May 9, 2011.

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  1. CALCOM

    CALCOM

    5
    0
    May 6, 2011
    how much difference will a transistor with Hfe 15-20 & 20-25 will bring to the circuit while all other parameters being same.
     
  2. poor mystic

    poor mystic

    1,066
    31
    Apr 8, 2011
    It depends entirely on the circuit. Well-designed ccts don't depend much on the current gain of a transistor, but for poorly designed circuits the case is quite different.
    What about posting the circuit diagram please?
     
  3. CALCOM

    CALCOM

    5
    0
    May 6, 2011
    i think it depend on the biasing as well. but how much would it change for these two values?
     
  4. poor mystic

    poor mystic

    1,066
    31
    Apr 8, 2011
    I'm actually a bit amazed that such poor transistors are still available after all these years.
    Regardless, if there are 2 such transistors in a circuit and the correct operation of the circuit depends on them being matched... poor design, I say.
    How about putting the circuit diagram up so we can see what the cct is all about, then there might be something more helpful we can say.
     
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