Re: Nokia 6500 Classic stereo headphones adapter problem

On Wed, 21 May 2008 08:15:15 -0700 (PDT), schnide@xxxxxxxxxxxxxx put
finger to keyboard and composed:

On 21 May, 12:59, "Dave Plowman (News)" <d...@xxxxxxxxxxxxxxx> wrote:
In article
<e4fe7d1b-3c7c-4d68-9a57-181035277...@xxxxxxxxxxxxxxxxxxxxxxxxxxxx>,
   <schn...@xxxxxxxxxxxxxx> wrote:

I have a Nokia 6500 Classic mobile/cellular phone.  It has a mini USB
connector to plug in both the charger or accessories such as a stereo
headset.  The supplied Nokia headset works fine, but is simply not a
very good design.
I tried eBay for several different third party connectors and have now
tried four, including eventually Nokia's own AD-55 mini USB adapter
and none of them work.  When you plug headphones into them, they all
say "Connected device takes too much power - please disconnect".

Only guessing, but USB spec doesn't include analogue signals - just digits
and DC. So again I'd guess the Nokia unit includes electronics.

--
*Cover me.  I'm changing lanes.

    Dave Plowman        d...@xxxxxxxxxxxxxxx           London SW
                  To e-mail, change noise into sound.

You're right Dave - the Nokia unit which works does include
electronics. There's a microphone piece as well as a dial to change
volume, and a button to advance track number.

Does this document..

http://sw.nokia.com/id/596e3800-879f-4ae4-a599-8bbbef14f2d4/Series_40_Platform_USB_Audio_Device_Requirements_v1_0_en.pdf

..clarify for your whether any mini-USB attachment with a 3.5mm stereo
adapter would require some electronics in-between to convert a digital
to analogue signal? That's assuming I've understood what you suggest
the problem might be.

You may be able to find your cable pinouts here:
http://pinouts.ru/connector/4_pin_USB_A_or_USB_B_plug_connector.shtml
http://pinouts.ru/cgi-bin/view_filt.cgi?text=nokia&lang=eng

To convince yourself that your adapter is a digital device, you could
connect it to your PC with an appropriate cable and then use
Microsoft's UVCView.exe or usbview.exe to display the device
characteristics. I'm assuming that your adapter would not be a host.
If it is a host, then the above won't work.

I'm using Windows 98SE. In Control Panel's Device Manager, under the
Power properties for the USB Root Hub, I see that my USB flash drive
reports that it requires 100mA max current. I'm not sure, but I
suspect that Win XP may be able to report the actual current draw.

UVCView and Usbview both report that my USB phone is bus powered and
requires 200mA MaxPower. These utilities may also be able to tell you
who is the real manufacturer of your devices.

If you can't find the above utilities, contact me via email.

- Franc Zabkar
--
Please remove one 'i' from my address when replying by email.
.

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