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Getting more gain from 5532 op amp?

Discussion in 'General Electronics Discussion' started by Bluesguy, May 20, 2013.

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  1. Bluesguy

    Bluesguy

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    May 19, 2013
    I am using a 5532 op amp for a small mixer to mix two keyboards for live performance. I know the op amp is desgned/compensated for unity gain.. One of the key boards out put is quite a bit greater than the other so I have been using a feedback resistor 5 to 10 times the the resistors on the inputs for 5 to 10 gain. It works pretty well but I now get distortion fron the hotter keyboard if I turn it up much. I am new to the site and could not get a diagram to upLoad as the buttons were greyed out but I took the design frm Craig Anderton's Electronics Projects for Muscians which a lot of People seen familiar with.


    Is there an easy way to get more gain without this distortion? I can work around it but would like to know how to fix this.
     
  2. CDRIVE

    CDRIVE Hauling 10' pipe on a Trek Shift3

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    May 8, 2012
    Why don't you use a switch to select the feedback resistor (Rf)? This way you can have two gain positions to handle either keyboard. The other option would be two inputs with a different value of Rin connected to each input jack.

    Chris
     
  3. Bluesguy

    Bluesguy

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    May 19, 2013
    That's a great idea! I need them both going at the same time so a switch will not work but if you mean using a lower input resistor for the keyboard with the lower line level signal so I will get a unity for the stronger signal but boost the lower signal that would be cool Here is my understanding of what you are suggesting. I will try it out on my breadboard this week. I attached a GIF. Hope it shows up. And either way thanks a bunch.
     

    Attached Files:

  4. Bluesguy

    Bluesguy

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    May 19, 2013
    Oh, and I meant to include R1 = 10k = RF for the hotter input and R2 approx = 1-2K for 5 to 10 v gain for the weaker one.
     
  5. CDRIVE

    CDRIVE Hauling 10' pipe on a Trek Shift3

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    May 8, 2012
    Yes, that's the general idea.

    Chris
     
  6. BobK

    BobK

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    Jan 5, 2010
    I would go with higher resistors all around though. 10K 100K and 100K. The 1K input resistor is probably loading that input more than it should.

    Bob
     
  7. CDRIVE

    CDRIVE Hauling 10' pipe on a Trek Shift3

    4,960
    652
    May 8, 2012
    Bob brings up a good point. I'm not a musician but I believe the input impedance of many instrument amps are hi Z, so the drivers that feed them expect same.

    Chris
     
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