Connect with us

Changing DC level from a sensor

Discussion in 'Hobby Electronics' started by JERD, Aug 31, 2010.

Scroll to continue with content
  1. JERD

    JERD Guest

    I have a sensor whose output varies from +2.5 volts DC to + 4.5volts DC.
    I would like to 'shift' this to become 0 - 2volts DC.
    Presumably with an op-amp?
    Single supply IC preferable e.g. LM358
    Appreciate some advice on how to accomplish this.

    JERD
     
  2. terryc

    terryc Guest

    Put a 2v zener ad a resistor in series across the output and take the
    reading off the resistors?
     
  3. Jasen Betts

    Jasen Betts Guest


    simple summing network:

    .--R--0V
    |
    in --R-o-+\
    | >-o--- out
    2.5V -R-o--/ |
    | |
    `--R--'

    dunno how close to 0V that'll go, use larger R if necessary.
     
  4. **Buy yourself a copy of Walt Jung's 'OP Amp Coookbook'. You can work it out
    for yourself. Alternatively, you can scan the Natsemi datasheets for some
    common OP amps. There will probably be an application note suitable for your
    needs.
     
  5. JERD

    JERD Guest

    Thanks for all replies of assistance.

    My preference is for it to go to zero.

    I am going to have a try of all of the suggestions and increase my knowledge
    at the same time. At age 68 the brain doesn't work as well as I would like
    these days!

    JERD
     
Ask a Question
Want to reply to this thread or ask your own question?
You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.
Electronics Point Logo
Continue to site
Quote of the day

-