pnp transistor switch

Discussion in 'Homework Help' started by becky, Aug 28, 2005.

  1. becky

    Thread Starter New Member

    Aug 28, 2005
    1
    0
    Hi,
    My brain is still thinking about the summer and I have forgotten how to figure the saturation current for a pnp transistor switch. Do I use the Ω of the resistor before the switch on the B line with the Vdc input or do I use the Ω of the coil of the relay on the bottom with the Vdc? I would have to subtract the .7V from the Vdc no matter which Ω I use, right?
    Thanks!
    Becky
     
  2. mozikluv

    AAC Fanatic!

    Jan 22, 2004
    1,437
    1

    hi becky,

    use the coil resistance for your current supply :D
     
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