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voltage controlled resistor

Discussion in 'Electronic Components' started by [email protected], May 16, 2007.

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  1. Guest

    Does anyone know of an IC chip for to be used as a variable resistor
    whose resistance value may be controlled by varying its voltage input/
    signal
     
  2. Ray King

    Ray King Guest

    Sounds like a fet
     
  3. Yes. Try the H11F1 optoFET. That can vary from >300 Mohms down to a few
    tens of ohms or less, when its LED is fed by an input voltage via a series
    resistor. I haven't yet tried it for linearity, but it's a nice idea
    because it isolates input and output. If you use the output to drive
    another FET, you can probably arrange a near-zero ohms to >300 Mohms
    resistor.
     
  4. Jamie

    Jamie Guest

    Hmm.
    how about a Mosfet ?
    or something in the line of a 4066 which does not get
    you in the low order of R but can be some what controlled
    via voltage.
     
  5. mw

    mw Guest

    Yes. Try the H11F1 optoFET. That can vary from >300 Mohms down to a few
    I just got an email 2 days ago that says the H11F1 was just announced as
    discontinued:

    "You have purchased the following part number(s) from Digi-Key within
    the last two years. The manufacturer has announced this part(s) will
    become obsolete. Please click on the link below for more information on
    possible substitutes.

    FAIRCHILD OPTOELECTRONICS GROUP
    Description: OPTOCOUPLER FET BILAT 6-DIP
    Manufacturer Part Number: H11F1
    Digi-Key Part Number: H11F1-ND"
     
  6. They're multisourced, I think. I doubt it's entirely obsolete. It better
    hadn't be, anyway.
     
  7. mw

    mw Guest

    They're multisourced, I think. I doubt it's entirely obsolete. It better
    I looked at Fairshild's site... the H11F1, H11F2, and H11F3 are all
    listed as lifetime buy. I didn't find any recommendations about
    alternatives, except on their obsolete search they recommend "H11F1M",
    which doesn't exist.

    Nice...
     
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