Basic op-amp audio amplifier

Discussion in 'The Projects Forum' started by dingari, Jan 25, 2014.

  1. dingari

    Thread Starter New Member

    Jan 25, 2014
    10
    0
    Hello, I've got a really basic circuit set up with an RC4558P op-amp (http://www.ti.com/lit/ds/symlink/rc4558.pdf). But it does not work. I've attached pics of my circuit diagram along with my breadboard setup. Could anyone shed some light on what I'm doing wrong?

    I know the op-amp IC is functional since the voltage follower circuit I set up for virtual ground works.

    I'm using a mono plug for input from my phone and a stereo plug for output (just one channel). Both plugs and op-amp salvaged from an old guitar amp.
     
  2. crutschow

    Expert

    Mar 14, 2008
    13,000
    3,229
    What is the load on the op amp output? The minimum is about 2k ohm.
     
  3. dingari

    Thread Starter New Member

    Jan 25, 2014
    10
    0
    I was testing with my HD-202 headphones. But I have figured out that my 6.35" jacks were wrongly wired. Will post back as soon as I fix that, with results.

    EDIT: it works, silly me :/ thanks anyway
     
    Last edited: Jan 25, 2014
  4. dingari

    Thread Starter New Member

    Jan 25, 2014
    10
    0
    I figure I shall just ask here instead of creating a new thread.

    Is there need for a voltage follower when powering the op-amp off two 9V batteries?
     
  5. #12

    Expert

    Nov 30, 2010
    16,261
    6,770
    You don't need the op-amp for centering the ground when you use (2) nine volt batteries.
     
    dingari likes this.
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