Constructing a "perfect" current meter

Discussion in 'Homework Help' started by Velocity, Apr 6, 2009.

  1. Velocity

    Thread Starter Member

    Feb 27, 2009
    All right guys, this one is coming straight from The Art of Electronics... I have to use a 411 op-amp and a 1mA meter to construct a "perfect" current meter (with zero input impedance) and with 5ma full-scale. The meter would never be driven more than ±150% full scale... assume the 411 swings to ±13V (±15V supply), and the meter has a 500Ω internal resistance.

    I don't even know where to start on this one (except with the op-amp being there... that I know :D).
  2. Thevenin's Planet

    Active Member

    Nov 14, 2008
    Ahhhh....What will be doing the reading , analog or digital ?:cool:

    GMT -7