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MP3 player - charging

Discussion in 'Hobby Electronics' started by Glenda and Bob Scott, Feb 11, 2008.

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  1. I have a Sony NWD B103F MP3 player that is designed to charge its battery
    through a USB computer connection.

    I don't always have a computer with me when I want to use the MP3 player, so
    I have tried to charge the battery by simply connecting a regulated 5 volts
    to the correct USB power pins (Pins 1 and 4, with no connections to pins 2
    and 3). However, this does not work with the B103F. It seems that it is
    necessary to more closely simulate a USB port, presumably with voltages (or
    no voltages) on the USB data pins (Pins 2 and 3).

    Does anyone know how this can be done, please?
  2. Some devices require an actual USB handshake before they start drawing
    enough power to charge - This is the USB spec. Unfortunately, that
    requires a complete USB host controller in the charger. Every charger
    that I've seen is just a dumb +5V supply, so some polite devices can't
    be charged.

    Nicholas Sherlock
  3. Bob

    Bob Guest

    Thank you, Nicholas, and thank you also, TT, for your informative responses.
    It seems that building (or even buying) a suitable USB charger is not a
    simple matter. I will just have to continue relying on a computer to keep
    the B103F charged.

  4. Bob

    Bob Guest

    No, TT, I have not tried the DSE unit. It's quite reasonably priced and I
    would be quite happy to buy it, if it was certain to work. However I
    suspect that it does nothing more than providing 5 Volts to USB Pins 1 and
    4, which I can easily do myself. I think that my Sony B103F may be much
    more fussy about its charging source than the iPods and Creative's Zen

    When I originally Googled this topic I found that someone had built a
    charger by simulating a USB port with a network of resistors connected to
    the USB Data pins, but this did not work for me either - in fact, after
    trying this I needed to press the master reset button on the B103F to get it
    working again. This fussiness about its charging source may be a good
    reason for many people to avoid Sony MP3s. AFAIK Sony doesn't sell a
    charger for this unit.

    Thanks anyway
  5. Elmo

    Elmo Guest

    Tried ebay?
  6. Bob Parker

    Bob Parker Guest

    Remember that DSE's got a 14 day period for you to return something
    if it doesn't do what you want. If you've got time, you could try that

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