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Thread: A "Mac'd V"

  1. #61
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    Quote Originally Posted by heavymetals View Post
    Finished!

    Whoo Hoo!

    The modified OEM radio re-installed.

    The Mac Mini wired and installed (power supply is in center console)

    The 5 volt regulator and breath mint box I enclosed it in.

    The 5.1 decoder with the 5 volt regulator in circuit.

    Now all that is left are software applications.
    What chip did you use to power in that mintbox? Heat sync big enough?!

  2. #62
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    Quote Originally Posted by psi3000 View Post
    What chip did you use to power in that mintbox? Heat sync big enough?!
    Just a 5 volt regulator LM series.

    Mint box is the heat sink and mounted to the amplifier heat sink, no worries at all.

  3. #63
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    Nov 2012
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    UPDATE:

    Interfacing the OEM radio/nav to the 5.1 sound is the new project.

    Tried using LOC's and the distortion from the transformers is too much to bare.

    Going to use a differential to single end conversion chip (4, dual amps on one IC) to convert the differential signals (pre amplifier) from the OEM and mix them then feed to the 5.1 decoder.

    We shall see.

  4. #64
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    Nov 2012
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    UPDATE:

    Grabbed the audio feed from the radio and it is differential.

    Found a chip that will convert from differential to single ended and it works great.

    Now the problem is volume control as the OEM radio controlled volume via class II to the BOSE amplifier.

    What an engineering POS.

  5. #65
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    Nov 2012
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    UPDATE:

    I had to get two switching power supplies that put out 15 volts (adjustable) so I could supply the positive and negative rails for the chip to work.

    Then I found software that actually made it play through the Mac Mini.

    "Linein", "Soundflower", and "AU Lab".

    So now I have volume and tone control over the OEM audio feed.

    WHOO HOO!

  6. #66
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    Nov 2012
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    Here is the interface.

    2 ICs, 4 caps, 6 resistors.
    Attached Images Attached Images  

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