op-amp as a linear inverter

Discussion in 'General Electronics Chat' started by mohansaini, Apr 26, 2010.

  1. mohansaini

    Thread Starter New Member

    Apr 22, 2010
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    Hi...
    i want to use an op-amp as a linear inverter for 12V Ac.
    an inverter works in form om 0-1 for DC. Pl z tell me that either it works for AC inverting or not.
     
  2. bertus

    Administrator

    Apr 5, 2008
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    Hello,

    Can you post a drawing of what you have in mind?
    Do you want to change the phase of an AC signal with 180 ° ?

    Bertus
     
  3. mohansaini

    Thread Starter New Member

    Apr 22, 2010
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  4. bertus

    Administrator

    Apr 5, 2008
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  5. mohansaini

    Thread Starter New Member

    Apr 22, 2010
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    hi,
    I have already tried it but nothing is +ive plz suggest any other option i m still waiting....
     
  6. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    That 300 volt signal might be a bit above a level any op amp can handle. You need to use a transformer to drop the voltage to something reasonable.

    What is the purpose of the the circuit? Inverting those excursions appears to undo the rectification.
     
  7. SgtWookie

    Expert

    Jul 17, 2007
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    I think you are looking for something more like the attached circuit.

    If you are dealing with mains power for an input, you must use an isolation transformer, otherwise it won't be safe.
     
  8. mohansaini

    Thread Starter New Member

    Apr 22, 2010
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    Hi
    Sir, as u can see from the schematic i have reduced this Ac signal to 13V ac by using potential devider. as i have already shown the waveforms i got on CRO i want to reverse Vr2 by 180°. Instead of op-amp is there any other solution then plz tell me about that......
     
  9. SgtWookie

    Expert

    Jul 17, 2007
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    Did you even look at my suggested schematic?
     
  10. mohansaini

    Thread Starter New Member

    Apr 22, 2010
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    hi,
    Sir u r using an isolation transformer, which transformer i have is 25V to 25V so that i have to reduce that voltage to that level.
     
  11. mohansaini

    Thread Starter New Member

    Apr 22, 2010
    13
    0
    hi
    Bertus sir, lets start with the yesterday's problem how to invert the phase of an AC signal by 180° using op-amp.
     
  12. mohansaini

    Thread Starter New Member

    Apr 22, 2010
    13
    0
    hi
    Bertus sir, lets start with the yesterday's problem how to invert the phase of an AC signal by 180° using op-amp.
     
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