Thread: FM/DAB digital radio - THAT WORKS!!

  1. #1221
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    i forgot to add, for some reason I couldn't enable the ground pour on eagle so i've just uploaded it with the tracks in situe.
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  2. #1222
    ibf
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    Quote Originally Posted by nrgizerbunny View Post
    not sure why it didn't upload, so i will try again.
    Quote Originally Posted by nrgizerbunny View Post



    Here's the spec

    1. Venice 5.1 DAB/DAB+ and FM
    2. Slave firmware, runs with AndyWhittaker's plugin or the Venice 5 on RoadRunner
    3. Audio over USB using a TI PCM2902 Chip or 3.5mm Jack
    4. Draws 456mA under full load, Approximately 520mA on plugin
    5. Only 52 x 45mm
    6. Extremely large ground plane so less interference and more sensitivity
    Isnt that the same as the one that you said it would support USB over audio? I cant see the 2902 anywhere.

  3. #1223
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    Quote Originally Posted by ibf View Post
    Isnt that the same as the one that you said it would support USB over audio? I cant see the 2902 anywhere.
    Nope its different, have a look at the capacitor positions.
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  4. #1224
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    Quote Originally Posted by nrgizerbunny View Post
    Nope its different, have a look at the capacitor positions.
    The board doesnt seems to show any support for the 2902. The chip, the xtal and the rest of the parts for the USB audio would show even if it was placed underneath the board. Prove me wrong?

    Anyway it probably does not matter.

  5. #1225
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    Quote Originally Posted by ibf View Post

    You seems upset because I mentioned the big caps to E which blew the USB ports on his laptop. Do you really want that happening again?

    So, are you saying it was the fact that the caps were so big that would have blown my USB port and not that one was not soldered correctly.

    IE even if they were soldered properly they have caused the damage.

  6. #1226
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    its possible. Pulling 550mA may cause the USB chip to flag an error. Shorting out pins will blow it. Most newer boards have a 1500mA limit on the usb ports.

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  7. #1227
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    It's a laptop.

    The port doesn't work and I get an error message on boot up.

    And I got error messages about overvoltages when I connected the DAB radio I was testing for CF from Craig.

  8. #1228
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    Quote Originally Posted by Enforcer View Post
    So, are you saying it was the fact that the caps were so big that would have blown my USB port and not that one was not soldered correctly.

    IE even if they were soldered properly they have caused the damage.
    A discharged capacitor directly connected across the USB port supply will draw large current until it fills up. The bigger the value the longer it will load the port and it could be enough to damage it. Laptops seems more sensitive to this. A self powered external 2.5in HDD can also blow a port due to heavy current requirement. In a USB port there should be a bulk capacitor to allow for current surges when you plug in a device, this capacitor may not cope if you plug in an out of spec device.

    The reason why pluging in the radio (fully charges up the caps) then remove and repluging in may work, it is because those caps have been fully charged already, ie there is little disruption on the USB supply on replugs

    Try using an external powered hub or a powered USB device to see if the USB port still work. If it does then you know its the internal supply that broke inside your laptop. Does the radio work on your desktop?

    It is hard to tell what caused this, possibly a shorted caps or something, maybe they were just too big, a disconnected caps shouldnt cause problems.

    Its probably possible to repair it yourself, a board swap is usualy the norm in this case.
    Last edited by ibf; 03-18-2011 at 07:40 PM.

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    I know the port doesn't work any more. The Laptop has 3 the other two work with everything I plug into it, the one in question works with nothing.

    I think it may have done the same to one of the USB to my wifes' laptop as well.

    I also have question marks against the Carnetix powered USB hub that I use in the car, one of the ports went awol for a while (the one this unit was plugged into to test).


    Let's just say I am not very happy with CB and the unit at the moment.

  10. #1230
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    E, did you measure is there 5v on that "dead" usb port?

    if no, might be wise to open the laptop, and look for the USB fuse, usually right next to the jack
    and replace, this is asuming you can do SMT desoldering
    if you cant.... option #1 is get it to someone who can, option #2 replace whole Motherboard

    btw, what kind of laotop? dell?
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