Multi audio input to single headset

Discussion in 'The Projects Forum' started by bwanna, Aug 15, 2013.

  1. bwanna

    Thread Starter New Member

    Nov 19, 2012
    15
    0
    I'd like to create an interface that take multiple audio inputs (combination of stereo and mono types) and connects them to a single audio output, such that the inputs are isolated from each other.

    My first thought is to use a 1:1 transformer approach. Maybe even customizing a transformer with multiple input windings and a single output winding.

    Any thoughts?

    The setup is to be used on my motorcycle, where I can connect the cell phone, gps, and ham radio into the interface and the output goes to my helmet headset. I'd like to maintain the stereo integrity of the cell phone so that I can listen to music.

    Thanks all!!
     
  2. BobTPH

    Active Member

    Jun 5, 2013
    782
    114
    This is known as an audio mixer. Basically, just a headphone amplifier with high input impedance then a resistor, typically 10K from each source to the input. Assuming the inputs are all at a level to drive headphones, the amp would only need a gain of 1.

    Bob
     
  3. bwanna

    Thread Starter New Member

    Nov 19, 2012
    15
    0

    So the transformer approach would not be appropriate?

    Each of the sources are capable of driving the headphones.
     
  4. BobTPH

    Active Member

    Jun 5, 2013
    782
    114
    You could try just using a 33 Ohm resistor from each source, but this would reduce the level somewhat. If you can drive each signal high enough, it might work. How many sources Are we talking about? Hopefully, not more than 3 or 4.

    Bob
     
  5. bountyhunter

    Well-Known Member

    Sep 7, 2009
    2,498
    507
    rotary selector switch. about 69 cents.
     
  6. BobTPH

    Active Member

    Jun 5, 2013
    782
    114
    I think he wants all the sounds to come through at the same time.

    Bob
     
  7. bountyhunter

    Well-Known Member

    Sep 7, 2009
    2,498
    507

    I would think is head would explode with all that at once....
     
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