Im making a USB adaptor for a Kinect sensor [to use on my computer].

here the schematic of what I did,

kinec USB schematic

Now, the question,

I have soldered all cables with their color match, but There are 2 other "cables", the ones that go around shielding, and that are connected to the metal part of the actual connection, Shall I solder this 2 wires?, the golden and silver on picture

shield wires

Also, i have another question, the cable now will meassure like 6 meters, is this ok? or is it to long?



2 Answers 2


As shown and given your comments in text and comments, connecting the two braids makes sense and will PROBABLY be OK.

Q: How hard can this be?
A: More than it appears :-).

If both braids connect to their local negative wires I'd do it without question BUT be aware that you could just possibly get a signal earth loop (two earth wires, one via braids and other via negative wires form a pickup loop. This MAY cause hum in audio systems but usually no problems in digital systems. If braids and negative wires are not electrically connected at both ends I may leave the braids disconnected - it has a 99%++ chance of working OK.

The two systems are at the same ground potential as shown by using the common USB negative rail. It is very common practice for system metalwork to be at ground negative potential BUT not always.

In most cases where this is not the case then the cases / metalwork may be at mains ground potential if a mains power supply is used but not at output negative side potential, which may be floating relative to mains ground. In most cases connecting output negative to mains ground will do no harm.

NOT connecting the shields will usually do no harm in most cases. If they are connected to their local negative supply then it makes no difference. If they are not connected electrically to anything (which is unlikely) then it makes no difference. If they are connected to their local mains ground AND you run the two devices from two power points that have a ground potential difference (which difference you really should not have happening ! :-( ) then you could get a shock by touching both systems grounds at once and faulty operation may occur. If both system power supplies are connected to the same mains outlet then the above is not liable to be an issue except under certain mains fault conditions of one power supply - and this is liable to be very very very rare.


You can't count on colors of wires in different cables matching. You also can't directly connect more than one end device to a USB. Electrically, each leg of a USB is point to point from the host to the device. It is only a bus logically, not electrically.

  • \$\begingroup\$ hi, yes, I thought the same about the colors, but apparently they match,I have researched a bit and seems to be the same color for the cables to match. this is a "normal" hack to make the cable adaptor, i have only one device connected to my USB, the schematic is in case the original connection to the kinect is to be used. So if this colors are matching, should I soulder the wires that are connected to the metal part of the actual connector? thanks \$\endgroup\$ Feb 10, 2013 at 23:40

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