Optimal order of components

Discussion in 'The Projects Forum' started by paulsoulsby, Jun 3, 2013.

  1. paulsoulsby

    Thread Starter New Member

    Jan 9, 2013
    20
    0
    I have an audio output from an op amp that is at line level (+/- 0.5V). The op amp is an OPA2134PA, so has an output impedance of less than an ohm.
    After the output op-amp I need to do 3 things:
    add a capacitor for AC coupling to block DC
    add a 100ohm resistor for impedance matching
    add a 10k potentiometer as a volume control

    Is there a preferred order for these components?

    I've looked at various schematics for existing audio circuits and have seen them in a variety of orders.

    I'd just be keen to see if anyone has an opnion.

    thanks
    Paul
     
  2. mik3

    Senior Member

    Feb 4, 2008
    4,846
    63
    The 10K shall be at the input of the op-amp, not the output.

    A circuit diagram will help for further discussion.
     
  3. paulsoulsby

    Thread Starter New Member

    Jan 9, 2013
    20
    0
    Sorry, I should have explained further. The audio output from the op amp is a synthesizer. So the volume control is an output volume control for the synthesizer (rather than an input volume control of an audio amplifier).
    I'll post a circuit diagram as soon as I've drawn it!
    Paul
     
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