Current sources for load referred to ground

Discussion in 'General Electronics Chat' started by atferrari, Nov 26, 2014.

  1. atferrari

    Thread Starter AAC Fanatic!

    Jan 6, 2004
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    After reading about constant current sources, I defined the four cases shown in the pdf. Current should go up to 250 mA.

    Implementing B and C with the attached circuit (and its counterpart) is straightforward, but I am not sure how to proceed for A and D. I cannot have Rsense referred to ground anymore.

    How could I go away with no fancy ICs?

    Gracias for any help.
     
  2. crutschow

    Expert

    Mar 14, 2008
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    Here's a high-side current source with differential inputs, using a standard op amp, that may be of interest to you.
     
    atferrari likes this.
  3. atferrari

    Thread Starter AAC Fanatic!

    Jan 6, 2004
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    Wow. Quick and to the point. Have to find time to see how it works.

    High-side, have to retain that name.

    Gracias!!
     
  4. studiot

    AAC Fanatic!

    Nov 9, 2007
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    Two transistor two terminal topologies.

    2ccs.jpg
     
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