> To take advantage of low cost USB style power supplies, I did a
> product that uses an USB mini B connector as the power input. No
> data goes across the USB bus. I can find low cost A to mini-B
> cables out to about 10 feet.  But, of course, I have a customer
> that wants to put the wall mount power supply 30 feet away. He
> doesn't like stringing USB extension cords.

Two options...

First, I remember seeing various companies offer customer
cables including USB.  Hmm, names that come to mind don't
list anything in a real quick search.  Google likely knowns...

I did a google search on   custom usb cable   whereupon google
suggested adding the word   length   as a suffix.  Many hits.
Third one down (chosen on a whim)

  http://www.usbfirewire.com/custom/Custom_USB_FireWire_Cable_Design_Tool.h=
tml

I asked for a USB A male straight to USB mini-B male straight
with a 30' cable in between.  (Tool warned me that it violated
USB spec.)  Lots of options.  Price was $50 for onesies.  Might
be able to put 2 conductor heavier-gauge power-only wire between
as special order -- wouldn't hurt to ask.

Second: Digi-Key sells USB connectors and cable.  (I have laptop
coolers that were Fry's clearance items; they get their power
from USB a cable; all the USB power cables have failed (thus why
they were cheap & on clearance); I've rebuilt cables with parts
from Digi-Key.)  The manually soldered & manually assembled USB
connectors aren't as nice looking as molded ends, but they work
OK.  My use was also power-only.


Hopefully, your product doesn't pull a lot of current.  Are you
going to up the wall wart's voltage to account for voltage drop
in the cable?  Or do you have a regulator inside the product?
Or you could run 30 feet of 2-conductor 12-gauge wire between
the USB connectors.  Just things to think about. :-)

						Lee Jones
--=20
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist
.