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Non Powered USB Cable


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Or you could just tape over the 5V pin both ends on an existing cable with some masking or electrical tape. Works just as well.

 

Red x marks the pins below;

 

5V_pin_usb.jpg

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I separated the power and data in my USB cable using a Power :: 5V power injector for USB (RB/411UAHR). Super cheap.

 

With many USB devices you will need to leave the 0 volts (black wire) in situ.

 

How a Digital Audio file sounds, or a Digital Video file looks, is governed to a large extent by the Power Supply area. All that Identical Checksums gives is the possibility of REGENERATING the file to close to that of the original file.

PROFILE UPDATED 13-11-2020

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With many USB devices you will need to leave the 0 volts (black wire) in situ.

 

Well, the shell is still grounded so I find that lifting pin 4 does not make a difference--sonically or functionally. Lifting pin 1 does though! For more than 2 years I've been using a narrow slice of a business card to that at the computer end. I advise against using tape as it can (does!) get stuck in the USB port.

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Alex C

I find that at least with USB memory on an external linear +5V PSU , that breaking the shield connection to the output socket makes an audible improvement by removing an earth loop on a PC that is connected to IEC mains earth.

There is an internal connection between shield and the 0 volts line in many USB devices including USB memory .

I wouldn't use tape either. I replace the USB-A plug at the PC end with a solder type plug where the red +5V lead is not connected, and then use heat shrink on the plug.

Regards

Alex K_

 

How a Digital Audio file sounds, or a Digital Video file looks, is governed to a large extent by the Power Supply area. All that Identical Checksums gives is the possibility of REGENERATING the file to close to that of the original file.

PROFILE UPDATED 13-11-2020

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+1 on blocking pin 1 on the computer side.

 

You know those plastic bits that go into the collar of a formal shirt. Cut a small piece to fit inside the USB plug (B side) and it is just thin enough to still fit and block Pin 1. If you need it to stick, use a tiny bit of blu-tac.

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