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Hfe question...

Discussion in 'General Electronics Discussion' started by trgf2250, Oct 23, 2015.

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  1. trgf2250

    trgf2250

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    Oct 23, 2015
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    Hello, I'm using Pspice first time.
    what is exactly "Maximum forward beta"?
    I thinks that means beta, but if i use only 1mA, or more
    then maxium beta would be changed.

    and what value is beta - usally call just 1 value.....
    what is standard?
     
  2. Bluejets

    Bluejets

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    Oct 5, 2014
  3. Colin Mitchell

    Colin Mitchell

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    Aug 31, 2014
    The collector-emitter voltage is very high in the example above.
    Normally you want the c-e voltage to be less than 0.5v (for a number of reasons) and this is the first thing you should sort out.
    The next thing is to add a load to the circuit and work out how much current will flow through the load.
    Suppose it is 100mA.
    Then you assume the transistor has a gain of 100.
    This means the base needs 1mA.
    Can you supply 1mA to the base?
    Then you use a transistor that will pass 200mA or MORE and put it in the circuit.
    Use a transistor with a rating of 200mA to 500mA.
    If the voltage is more than 12v, you may need to look at the voltage rating of the transistor.
    That's the simple approach.
     
    Arouse1973 likes this.
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