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DIY OTG Micro USB B cable to USB B Tutorial
Oct 19, 2013 at 7:58 PM Post #20 of 57
  1. Thanks for this FraGGleR!
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I used your tutorial to make my first OTG cable. It was my first time using epoxy putty as well; had no idea it'd be so sticky.
 

 

 
It ended up being a little too long, so it's gonna bother me enough into making another one soon.
 
Feb 13, 2014 at 9:29 AM Post #21 of 57
Hi!
 
Bumping this old thread up here... 
 
I'm also into making a USB OTG cable for my portable rig, but there are a few things I wonder. Do you need any special type of cable for the digital signal to be optimal, any directives concerning impedance etc? Also, is there any need for shielding on such a short cable? I reckon you didn't shield yours, but most OTG cables on the market are shielded. Do you have any problems with EMI? 
 
Thanks in advance! 
 
Feb 13, 2014 at 11:49 AM Post #22 of 57
sjolander21 said:
  Hi!
 
Bumping this old thread up here... 
 
I'm also into making a USB OTG cable for my portable rig, but there are a few things I wonder. Do you need any special type of cable for the digital signal to be optimal, any directives concerning impedance etc? Also, is there any need for shielding on such a short cable? I reckon you didn't shield yours, but most OTG cables on the market are shielded. Do you have any problems with EMI? 
 
Thanks in advance! 
Click to expand...

No special considerations were made for either given the short length of the cable.  I don't get any audible interference with the cable, even when using LTE data to stream music from Pandora and don't know what improper impedance would even sound like for digital streaming.  If you are concerned about either interference or impedance issues, you can always use a cut portion of a standard USB cable and simply reterminate for your purposes.  Having made nearly a dozen USB cables out of different materials, gauges, and geometries, I don't think even things like out of spec impedance audibly impact audio streaming signals.  
 
Feb 13, 2014 at 12:32 PM Post #23 of 57
sjolander21 said:
  Do you need any special type of cable for the digital signal to be optimal, any directives concerning impedance etc?
Click to expand...

No, especially not at this lenght. But the cable should be appropriately sized and easy to work with, the solder pads on the micro USB are quite small... Oh, and make sure you get decent micro usb connectors because bad ones will damage your phones usb port!
 Also, is there any need for shielding on such a short cable?
Click to expand...

I don't think there is. Most overpriced "audiophile" USB otg cables aren't shielded either, which I think is rather funny.
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Do you have any problems with EMI? 
Click to expand...

Not at all.
 
Mar 25, 2014 at 4:09 AM Post #30 of 57
i just received these from ebay yesterday, extremely disappointed with the fitting. The fitting is so tight i am scared that i will spoil my phone by just plugging it in. Pulling it out requires exaggerated strength too.
Anyone who obtained better stock from ebay, care to share the URL to the item?
 
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