Voltage to current converison at zero input ?

Discussion in 'Homework Help' started by Mctwist, Feb 3, 2011.

  1. Mctwist

    Thread Starter New Member

    Feb 3, 2011
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    Hi everyone,
    New to the forum and looking for some help.
    im trying to design a voltage to current converter (op amp) to output 25mA at full input and 5mA at zero input. Ive been struggling with this, i've been trying to connect the supply rails with potential dividers across the input to hold the minimum 5mA around the loop. But this is where I hit problems. Does any body have any advice on how to achieve this ?
    Thanks in advance :)
     
  2. Jony130

    AAC Fanatic!

    Feb 17, 2009
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  3. Mctwist

    Thread Starter New Member

    Feb 3, 2011
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    My circuit input voltage range is quite small. It will be 0volts to 18.714mVRMS
     
  4. Mctwist

    Thread Starter New Member

    Feb 3, 2011
    10
    0
    @Jony130 Im interested in that circuit design, my circuit has a single input signal so should i connect a supply rail to to the inverting input ?
    Here is a basic circuit ive been attempting, but it has an extreemly large input coupling capacitor:
    [​IMG]
     
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