Problem with LM1036 amplifier

Discussion in 'The Projects Forum' started by Joey Radical, May 22, 2014.

  1. Joey Radical

    Thread Starter New Member

    May 22, 2014
    Okay, so we're doing an electronics project in school. Bear in mind that I'm not that experienced in this field. Anyway, we've built an amplifier circuit which contains, among other things, an LM1036 amplifier. We're having some problems with this component.

    On page 7 of the datasheet found here you can see how this component is applied. We've used pretty much the exact component for resistors, caps and such.

    Now here's the problem. If we send a sine wave to input 1, we get a corresponding sine wave on output 1 but with increased amplitude. Pretty much what we want. However if we send a sine wave to input two, we somehow get a DC voltage at output two. The DC voltage we get is the same as the supply voltage we're using, so it might be related to that somehow. However, we don't know why we get this, and as you understand it is quite troublesome, as we need to use both inputs.

    Any ideas of how we might have screwed up this circuit?
  2. ronv

    AAC Fanatic!

    Nov 12, 2008
    Since it is symmetrical you probably have a wiring error.
  3. Joey Radical

    Thread Starter New Member

    May 22, 2014
    Like bad soldering or something?
  4. Ramussons

    Active Member

    May 3, 2013
    Pay attention to Pin 9. That's the balance control. An "open" or "short" on this pin will give you such results.