Active resistance

Discussion in 'The Projects Forum' started by madhurendra, Nov 24, 2011.

  1. madhurendra

    Thread Starter New Member

    Nov 24, 2011
    4
    0
    hi all,

    can anybody help me, how to vary amplitude of a waveform or pulse using micro controller and pushbutton switch. I dont want to use POT.
     
  2. bertus

    Administrator

    Apr 5, 2008
    15,648
    2,348
    Hello,

    You could take a look at the LM13700 transductance amplifier.

    Bertus
     
  3. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    You could also use an R-2R ladder.
    You should buffer the input signal using an opamp wired as a voltage follower.
     
  4. MrChips

    Moderator

    Oct 2, 2009
    12,449
    3,363
    You could use a digital pot such as Microchip MCP41010 or Maxim DS1267, for example.
     
Loading...