current mirror

Discussion in 'General Electronics Chat' started by vultac, Aug 20, 2010.

  1. vultac

    Thread Starter Active Member

    Mar 2, 2009
    142
    0
    Hi all,

    I would like to ask how does this circuit actually works?

    Is the collector of the transistor Q4 an output (sourcing current)? through controlling the Vcc?
     
  2. kingdano

    Member

    Apr 14, 2010
    377
    19
  3. kingdano

    Member

    Apr 14, 2010
    377
    19
    the collector of Q4 cannot be disconnected.

    it needs to be tied to a voltage source to draw current.
     
  4. vultac

    Thread Starter Active Member

    Mar 2, 2009
    142
    0
    capacitor c2 will discharge through R2 and pin 7, at the junction where the current mirror is connected to pin 7 will the current "flow out" from the capacitor to the current mirror to ground? hmm or isit voltage drop will be different for capcaitor :confused::confused:
     
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