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TL082: TL082 is not working fine as subtractor

Prodigy 20 points

Replies: 5

Views: 320

Part Number: TL082

WHY IS THIS OPAMP(TL082) NOT WORKING AS SUBTRACTOR (UNDER LOW DIFFERENTIAL INPUT   & GAIN=1)? Application diagram is same as the diagram in the link. In the circuit, V2 range is 12Volt to 14Volt, V1 is 12Volt  and R1=R2=Rf.     And suggest an opamp that works in low differential input voltage. Thanks

  • Hi Harikrishna,

    for me the circuit works beautifully:

    harikrishna.TSC

    Kai

  • In reply to kai klaas69:

    Hi Harikrishna,

    Can you provide some further information or data? What does "not working" mean? If you have scope shots and schematics, that would be helpful. The link that you provided doesn't work for me. If you use the "insert code, attach files and more..." link on the page, you can attach files right to the E2E post which is the best way to go.

    Thanks,
    Paul
  • Hi Harikrishna,

    Note that Kai [not Paul] used a dual supply, +/-15V. with a single supply, the output won't get close to zero.

    Regards,
    Ronald Michallick
    Linear Applications

    TI assumes no liability for applications assistance or customer product design. Customer is fully responsible for all design decisions and engineering with regard to its products, including decisions relating to application of TI products. By providing technical information, TI does not intend to offer or provide engineering services or advice concerning Customer's design. If Customer desires engineering services, the Customer should rely on its retained employees and consultants and/or procure engineering services from a licensed professional engineer (LPE).

     

  • In reply to Ron Michallick:

    you got my problem, my application must use single power supply, can you suggest any other IC. The problem is inherent with a single supply because of output transistors in opamp. Is there any method, someone must've tried to overcome this problem, i think!.    The application is shown below, first opamp is providing +/- supply, 2nd and 3rd combined is an absolute circuit, last opamp is a subtractor, and i need the sustractor output with respect to GND, till zero.

  • In reply to harikrishna metta:

    Hi Harikrishna,

    you could take the TLV4171 or OPA4171. Both are output rail-to-rail OPAmps.

    Kai

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