Differential amplifier for audio...

Discussion in 'General Electronics Chat' started by Externet, Oct 23, 2014.

  1. Externet

    Thread Starter AAC Fanatic!

    Nov 29, 2005
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    Hi.
    Is there a single supply (+12V) differential amplifier circuit/schematic that you recommend for audio ?

    Separate audio sources will be from the unbalanced headphone outputs of two independent similar devices, and all signals simoultaneously present at both inputs of the differential amplifier must (ideally) not appear at the output.
    I will attenuate one or the other to obtain equal levels to procure the most cancellation from equal signals.
    Or by any method of your suggestion.

    Delay between equal signals is not expected. 100 Hz to 6 KHz should be enough.
     
  2. MikeML

    AAC Fanatic!

    Oct 2, 2009
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    LM386? I did something like what you describe to mix mono aircraft comm audio with stereo music.
     
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  3. ScottWang

    Moderator

    Aug 23, 2012
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    What's reason not to appear at the output?
    LM380 datasheet.
     
  4. Externet

    Thread Starter AAC Fanatic!

    Nov 29, 2005
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    Thanks. !
    Was not aware the plain LM386 had differential inputs until read your post. Should work fine; will try.

    Edited - added : Thanks, the LM380 also has separate inverting and not inverting inputs. Both should work. Equal signals do not appear at the output because are cancelled, only the different signals pass.
     
    Last edited: Oct 23, 2014
  5. ScottWang

    Moderator

    Aug 23, 2012
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    LM386 only has the Wmax about 1.25W, LM380 has 2.5W, if you want to use it should be choose the type as LM386N-4, it works for 5-18V.
     
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