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Building a signal splitter for MP3 & Satellite radio into car stereo

Discussion in 'Electronic Basics' started by B. Jones, Jun 17, 2004.

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  1. B. Jones

    B. Jones Guest

    Okay - I guess it's not really a splitter but here's what I'm trying
    to do.
    I have a Creative Nomdad MP3 player. In the car, I was using a
    cassette adapter for the signal (I have no AUX in or CD Changer
    controls). Works great, sounds great.
    Now I have a Sirius satellite receiver in the car so I have it
    connected up instead. I want to have both of them plugged up and
    operational. I opted to not just buy a couple of Y connectors that are
    used for splitting. Instead, I plan to build my own so I could mount
    it neatly.
    This is what I was thinking.
    |Car Stereo|<----
    ------------ |
    -------- |

    If it's just a straight passthrough (if I just connect the two inputs
    to the 1 output), and both devices are transmitting, the Sat output
    voltage will be applied to the MP3 output voltage. Is there any danger
    here? should I put diodes in line to prevent voltage from travelling
    *TO* the MP3 player from the Sat, for example, and vice versa?
    Anyone done this?
  2. vic

    vic Guest

    Yes there is.
    You may destroy the output buffers of the MP3 or Sat devices.

    Putting a diode would seriously alter the sound quality (it's not a
    linear device), besides the signal going from the player to the stereo
    doesn't imply the current flows in the same direction.
    Why don't you use a switch ?
  3. B. Jones

    B. Jones Guest

    Yeah, the more I think about it, the more I think I probably will use
    a switch.
    I've been e-mailing a guy that is doing the same thing in his Ranger
    (mine is a Ranger as well) that I'm trying to do in mine and here's
    what he came up with:
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