Author Topic: USB device not working with extension cable  (Read 3930 times)

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Offline dog80

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USB device not working with extension cable
« on: October 16, 2013, 12:50:45 pm »
I have a cheap set of USB powered speakers and I wanted to integrate a USB sound card into the speakers so they can work with just the USB cable plugged in (no MIC IN cable).

Problem is that the sound card (it is this one: http://img.ebw.gr/9001/usb-sound-card.jpg) doesn't seem to work with an extension cable attached. Even the LED won't turn on.

The voltage drop across the USB extension cable is insignificant, however I replaced it with a short piece of Cat5e cable (much thicker wires) soldered directly on the board.

Still no luck. Sometimes windows will pop a message that the device is not recognised. I tried the rear USB ports too and still nothing.

Any ideas?
 

Offline dog80

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Re: USB device not working with extension cable
« Reply #1 on: October 16, 2013, 12:53:17 pm »
Here's the wiring:

 

Offline amyk

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Re: USB device not working with extension cable
« Reply #2 on: October 16, 2013, 12:55:42 pm »
USB has a cable length limit. 3m for low speed, 5m for full and high speed.
 

Offline fluxcapacitor

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Re: USB device not working with extension cable
« Reply #3 on: October 16, 2013, 12:59:10 pm »
The red/black cable doesn`t look like its connected to anything ? .
 

Offline dog80

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Re: USB device not working with extension cable
« Reply #4 on: October 16, 2013, 01:01:33 pm »
USB has a cable length limit. 3m for low speed, 5m for full and high speed.

The length of USB cable I used was about 1 meter. The cat5 cable even less.
 

Offline Short Circuit

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Re: USB device not working with extension cable
« Reply #5 on: October 16, 2013, 02:01:16 pm »
- USB cable pair needs to be twisted up to the connection point.
- It seems you are powering the speakers from the USB also; probably too much (inrush) current
 

Offline dog80

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Re: USB device not working with extension cable
« Reply #6 on: October 16, 2013, 02:08:47 pm »
I redid the solder joints and it seems to work for now....
 

Offline amyk

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Re: USB device not working with extension cable
« Reply #7 on: October 16, 2013, 08:59:20 pm »
- USB cable pair needs to be twisted up to the connection point.
Very critical for high-speed, not so much for full and low.
 

Online Monkeh

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Re: USB device not working with extension cable
« Reply #8 on: October 16, 2013, 10:33:18 pm »
- USB cable pair needs to be twisted up to the connection point.
Very critical for high-speed, not so much for full and low.

Still no excuse for not even trying to keep wires twisted up to termination.
 

Offline Kryoclasm

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Re: USB device not working with extension cable
« Reply #9 on: October 16, 2013, 11:45:27 pm »
You might want to add an external regulated 5v source to power the speakers and just use the data lines of the usb. That way you will have plenty of power available.
“I predict that very shortly the old-fashioned incandescent lamp, having a filament heated to brightness by the passage of electric current through it, will entirely disappear.” -Nikola Tesla
 

Offline peter.mitchell

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Re: USB device not working with extension cable
« Reply #10 on: October 17, 2013, 04:46:00 am »
You might want to add an external regulated 5v source to power the speakers and just use the data lines of the usb. That way you will have plenty of power available.

Either that or whack in a buttload of capacitance. The speakers probably want a reasonably low impedance power supply.
 

Online wraper

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Re: USB device not working with extension cable
« Reply #11 on: October 17, 2013, 06:49:01 am »
Try to connect shield of the cable to the audio card where connector body was soldered.
 


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