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Picking transistors

Discussion in 'General Electronics Discussion' started by jackorocko, Jul 31, 2011.

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  1. jackorocko


    Apr 4, 2010
    So I want to know how one would choose a transistor for this classic Class A amp circuit given my specs. Also, what would be the power output if this was connected to a standard 8 ohm speaker?

    Vcc 24V
    Ic 50mA
    hfe 50

    I looked over at digikey and after a few filters applied I ended up with a list of 400+ different transistors.

    Attached Files:

    Last edited: Jul 31, 2011
  2. duke37


    Jan 9, 2011
    Your transistor appears to have got lost!
    The maximum current taken by the transistor will be limited to about 0.1A peak. that is +/- 0.05A peak or 35mA rms. Putting all of this into an 8 ohm speaker (I*I*R) gives a power of about 10mW.
  3. jackorocko


    Apr 4, 2010
    What formula are you using to figure rms value for current? This is where I get lost so please excuse my ignorance.

    edit: wikipedia answered my own question, a/sqrt(2) or 1.41
    Last edited: Jul 31, 2011
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