BJT resistance values help

Discussion in 'General Electronics Chat' started by DiTHL, Mar 20, 2013.

  1. DiTHL

    Thread Starter New Member

    Mar 19, 2013
    1
    0
    Hi,
    I need to calculate the resistance values of the circuit shown.

    The BJT is a BC337-40 and has a β of 250 and Vce = 0.7V and Vbe = 1.2V

    The opto-coupler has an average forward current of 80mA.
    Input is from a computer minimum of 2.5V. I've chosen to make values with 3V.

    I feel like it is simple but I just can't make the values match up when I calculate resistances.
     
  2. crutschow

    Expert

    Mar 14, 2008
    12,981
    3,221
    It would help if we knew what the circuit is for and what is the operating frequency?
     
Loading...