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Thread: LaserBoy Audio DAC correction amp kits!

  1. #21
    Join Date
    Jun 2008
    Location
    Boston, MA
    Posts
    58

    Talking

    Quote Originally Posted by drlava View Post
    Ok, the first round of kits was shipped out!
    Just got mine! Building it up right now!

  2. #22
    Join Date
    Jan 2006
    Location
    Akron, Ohio USA
    Posts
    1,754

    Default

    My friend Dean (the guy who designed this thing in the first place) was just here the other day and we were messing with a built kit. Somehow the connector from the USB sound card got put onto the pins one pin over to the left. This put the +5VDC on the ground pin.

    STINKY SMOKE!

    The 10uF tantalum cap that sits at the left end of the DC/DC converter, accross it's +5VDC and ground inputs, got toasted!

    So I swapped it out for another one and all is fine!

    I'd have to say that I am very impressed with that DC/DC converter. It is not as sensitive to damage as I thought it might be. I'm also pretty impressed with the USB power spec and the way it can turn off and protect itself from total annihilation.

    James.
    Last edited by James Lehman; 08-11-2008 at 21:46.

  3. #23
    Join Date
    Feb 2008
    Location
    Sweden
    Posts
    28

    Default

    I'm still waiting for my kit.
    I got me a USB soundcard as well. And some dichros and mounts.
    But i hate to wait for shipment.
    // Fredrik

  4. #24
    Join Date
    Oct 2006
    Location
    Cleveland, Ohio
    Posts
    2,342

    Default

    When you build these kits, first connect everything and power it up. If you are using the USB 6 channel dac, make sure the drivers are set as shown:


    While nothing is playing, measure the voltage on each channel with a voltmeter and adjust the offset pots for each channel to 0V

    Then, play this wav from windows media player with 'loop' on and adjust the gain pots on each channel till the voltmeter reads 5V. When you are finished, if you are using the EzAudDac driver, set the individual channel gains back to 0.

  5. #25
    Join Date
    Jan 2006
    Location
    Akron, Ohio USA
    Posts
    1,754

    Default

    Am I nuts or is there nothing in this wave?

    James.

  6. #26
    Join Date
    Oct 2006
    Location
    Cleveland, Ohio
    Posts
    2,342

    Default

    That's right, it's dead silence, full 5V deflection.

  7. #27
    Join Date
    Jan 2006
    Location
    Akron, Ohio USA
    Posts
    1,754

    Default

    OK. I guess that makes sense. When I open it to look at the wave, it looks like Audacity normalizes it to digital zero.

    James.

  8. #28
    Join Date
    Jun 2008
    Location
    Boston, MA
    Posts
    58

    Smile check it out!

    I built up the kit and put it in a snazzy little box with a DB25 ILDA connection. Very happy with the kit. Thanks to EVERYONE INVOLVED!



    Last edited by barold; 08-18-2008 at 21:01. Reason: didn't give thanks where it was well deserved

  9. #29
    Join Date
    Oct 2006
    Location
    Cleveland, Ohio
    Posts
    2,342

    Default

    slick!
    are you taking that to SELEM?

  10. #30
    Join Date
    Jun 2008
    Location
    Boston, MA
    Posts
    58

    Default

    I wont be making it to SELEM

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