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Device powered by computer usb port but not USB phone charger (U-phoria UM2)

Discussion in 'Power Electronics' started by jh_bach, Jan 14, 2021.

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  1. jh_bach

    jh_bach

    1
    0
    Jan 14, 2021
    Hello, just joined to the forum because I was looking for a solution for same problem mterry highlighted. I have U-phoria UM2 and I want to use it without laptop, just need to connect to a powerbank because I'm just interested to mix 2 signals. What is the solution on mterry issue? I cannot found solution in the forum...

    This post is moved from this old thread:
    https://www.electronicspoint.com/fo...er-usb-port-but-not-usb-phone-charger.288982/
     
    Last edited by a moderator: Jan 14, 2021
  2. Harald Kapp

    Harald Kapp Moderator Moderator

    11,956
    2,793
    Nov 17, 2011
    According to the manual the UM2 should work with a powerbank. Did you use the original Nitecore cable supplied? Does the UM2 work on a laptop but not on a powerbank?
     
  3. Jarod997

    Jarod997

    9
    1
    Aug 4, 2021
    I just posted on the original thread, but I'll recap here:

    I bought a UM2 for a non-computer application not realizing that the device was *only* USB powered. It powers on when plugged into a computer, but not a wall charger.

    I have a ticket in with Behringer, but so far no luck.

    There may be a voltage divider hack on the D+ and D- pins on the USB line which will make the device power on, but I don't want to hack it yet if I don't have to. The other possibility is that the device will only power on after it receives a data packet from a USB controller (eg a computer).

    *lightbulb* I just discovered my VoIP phone has a USB port which must have a controller in it, and it works to power on the UM2. This is significant evidence to support the USB Controller theory of how this thing is powered.
    Back to @Harald's point, the Powerbank may have a USB Controller in it, whereas a "power block" (eg just a simple plug in the wall USB charger), even a 2A rated unit, doesn't - and won't power on the device.
     
  4. Jarod997

    Jarod997

    9
    1
    Aug 4, 2021
    So, for clarity, here's a brief list of what does and doesn't work.

    Does:
    • Computer (Windows & Mac, desktop & laptop)
    • Yealink T46S VoIP Phone
    Does Not:
    • UPC Surge Protect power bar
    • TPA-46050200UU - 2000 mAh USB wall charging "block"
     
  5. Jarod997

    Jarod997

    9
    1
    Aug 4, 2021
  6. Jarod997

    Jarod997

    9
    1
    Aug 4, 2021
    So here's my last post about it. From what I've been able to figure out myself, this device is not a stand-alone pre-amp, it's a "sound card". It requires an OS to use it as an input and output sound device. (The two are separate, which is why there's a toggle on the front for "direct monitoring".)

    In the end, it turns out I don't need to use a pre-amp - but I thought I'd publish my findings for others.

    I hope it helps.
     
    davenn likes this.
  7. Harald Kapp

    Harald Kapp Moderator Moderator

    11,956
    2,793
    Nov 17, 2011
    Thanks for the update.
     
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