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Changing DC level from a sensor

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

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  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.

  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:

    in --R-o-+\
    | >-o--- out
    2.5V -R-o--/ |
    | |

    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
  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!

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