lift comp

Discussion in 'General Electronics Chat' started by DexterMccoy, Mar 24, 2014.

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  1. DexterMccoy

    Thread Starter New Member

    Feb 19, 2014
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    how does this lift comp circuit work

    It has diodes configured with op amps

    I'm not sure how the circuit works and the theory behind it
     
  2. wayneh

    Expert

    Sep 9, 2010
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    Why do you care? What's a "lift comp"?
     
  3. DexterMccoy

    Thread Starter New Member

    Feb 19, 2014
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    I just don't understand what those diodes do?

    It rectifies the voltage it seems
     
  4. MrChips

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    Oct 2, 2009
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    May I ask why you are trying to learn how this entire circuit does what it is supposed to do?
     
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  5. DexterMccoy

    Thread Starter New Member

    Feb 19, 2014
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    I'm not sure what it is supposed to do, that's why i posted it to see what you guys think it is or what it does

    maybe some tech might know what it is or does
     
  6. MrChips

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    What would you achieve by learning what it does?
     
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  7. DexterMccoy

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    Feb 19, 2014
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    to understand how it works , it's part of the circuit i'm troubleshooting
     
  8. MrChips

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    Why are you trouble shooting this circuit?
     
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  9. DexterMccoy

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    Feb 19, 2014
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    because the output voltage is wrong from stages after it compared to the input voltage of stages before
     
  10. MrChips

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    How do you know what the voltages ought to be?
     
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  11. DexterMccoy

    Thread Starter New Member

    Feb 19, 2014
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    I don't, the manual just says the input voltage of the very first stage and the output of the very last stage

    So I need to know how the circuit i posted works and the theory behind it so I will know what it does
     
  12. MrChips

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    What manual?
     
  13. DexterMccoy

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    Feb 19, 2014
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    Input is 2 vac , output is negative -.650 Vdc
     
  14. DexterMccoy

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    Feb 19, 2014
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    Input is 5.80vac, output is negative -6.00vdc
     
  15. DexterMccoy

    Thread Starter New Member

    Feb 19, 2014
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    Input is 4.00vac, output negative -2.75vdc
     
  16. kubeek

    AAC Fanatic!

    Sep 20, 2005
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    On some toher shots I saw it was a service manual for some honeywell unit.

    Dexter, is your goal to repair that unit, or to learn electronics?
     
  17. Papabravo

    Expert

    Feb 24, 2006
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    Lift Compensation. Looks like an autopilot.
     
  18. DexterMccoy

    Thread Starter New Member

    Feb 19, 2014
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    Yes its for an autopilot , why does it convert an ac voltage into a negative dc voltage?
     
  19. DexterMccoy

    Thread Starter New Member

    Feb 19, 2014
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    See how it converts an AC input voltage into a negative DC voltage

    Input is 2 vac , output is negative -.650 Vdc
    Input is 5.80vac, output is negative -6.00vdc
    Input is 4.00vac, output negative -2.75vdc
     
  20. profbuxton

    Member

    Feb 21, 2014
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    Dear Dexter,
    If as you suggest you are working on flight electronics I would be interested to know which airlines equipment you are working on. I would make sure I never used that airline.
    How anyone can allow you to "play" with such equipment with the apparent lack of knowledge of complex electronics you seem to display is beyond me.
    I seriously suggest you need to undertake a comprehensive course in Electronics before being allowed to work on such vital equipment.
     
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