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RE: DIY silver USB cables

Posted by Ryelands (A) on August 8, 2017 at 09:20:04

In Reply to: RE: DIY silver USB cables posted by Duster on August 7, 2017 at 15:51:37:

. . . the characteristic impedance of a USB digital interface is 90 ohms.

The impedance of a LAN cable's twisted pair is (I'm told) 100R +/- 10%, IOW a good match for USB.

I've DIY'd several USB cables for audio using cable pulled from decent LAN cable (see e.g. Excel or Blue Jeans - no need IMHO for silly-money stuff) and separately screened the D+/D- and Gnd lines (+5 not required in my case) using that self-adhesive copper tape guitar players use configured as a Faraday Cage.

They're a bit fiddly to make and won't win any design awards but they skulk out of sight at the back of the rack and out-perform the few commercial cables I've tried despite the latter selling for prices I'll not admit to in public.

That said, I hope soon to try an Uptone Audio PCB "cable" - see link.

Dave

• https://uptoneaudio.com/products/uspcb-a-b-adapter   (Open in New Window)

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