Need assistance with a scaling/offset circuit, followed by an LPF

Discussion in 'The Projects Forum' started by Tyler Bradbury, Mar 18, 2015.

  1. Tyler Bradbury

    Thread Starter New Member

    Mar 18, 2015
    13
    0
    I am trying to scale a voltage, offset it, and then send it through an LPF with a 1 time constant. I can scale it and offset it appropriately, but when I put it through a passive LPF, thi signal gets messed up. Here is a picture.

    Question: I want 0-3.3v analog output. After the first stage, I get that. After my LPF, the signal goes to 1.6V and stays there. Why? How do i fix it? Is there a better way to do this?

    Thank you in advance.
     
  2. Tyler Bradbury

    Thread Starter New Member

    Mar 18, 2015
    13
    0
    I have figured it out. How can I delete this post?
     
  3. Papabravo

    Expert

    Feb 24, 2006
    10,144
    1,790
    Do you mean that the output is DC at 1.6 volts? If so the corner frequency is way too low. Sounds like a low pass filter that passes frequencies less than .001 Hz.

    BTW that image is really crappy and I can't read the component values. You can include images in several formats as long as the are not multi-megabyte bitmap or jpeg files.
     
  4. Papabravo

    Expert

    Feb 24, 2006
    10,144
    1,790
    There should be a delete button available for that purpose, but why?
     
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