Another Ext>usb Thread :s

[Samba Pa Ti]

ok after extensive search of the forums, ive found schematics on howto make this f'in cable but im stuck...
i can get all the parts and wire it up but where do the grounds go ?
i read it has to go to the "common ground" but thats not much use (is it on the usb hub or the gp2x ?)

im assuming pin 13 on the ext socket is the common ground, (i just ground everything to there ?)

heres the pictures im working off

http://img138.imageshack.us/img138/3328/usbcordya2.jpg

http://img138.imageshack.us/img138/7539/bobusbfilterna5.png

any help appreciated as im confuzzled enough with usb wires

 

[nubie]

ok after extensive search of the forums, ive found schematics on howto make this f'in cable but im stuck...
i can get all the parts and wire it up but where do the grounds go ?
i read it has to go to the "common ground" but thats not much use (is it on the usb hub or the gp2x ?)

im assuming pin 13 on the ext socket is the common ground, (i just ground everything to there ?)

heres the pictures im working off

http://img138.imageshack.us/img138/3328/usbcordya2.jpg

http://img138.imageshack.us/img138/7539/bobusbfilterna5.png

any help appreciated as im confuzzled enough with usb wires

If you look on this picture: http://wiki.gp2x.org/wiki/Image:Bob_ext.png

any pin marked "gnd" should be fine, I made my USB to EXT dongle and I am pretty sure I used a ground different than pin 13 and it worked fine.

I believe it was pin 24, since it is on the edge it is really easy to solder too.

Any ground will do, preferably the easiest to solder too:

On my Samsung Cell-phone e810 cable there was a nice solder pad that I was able to use, I did have to cut one of the traces on the Samsung circuit board that was going to the wrong pin.

If you are looking at this technically you want to start with the GP2X ground plane, the USB hub gets grounded through the USB connector you are wiring up. The schematic is a Host (IE computer/GP2X side) termination, it should ground closest to the host. The termination happens to make the USB less susceptible to interferance.

 

[Samba Pa Ti]

ahh that would make sense, its funny i cant figure out how to ground a cable up but i can ground a guitar up easily :S severe mental blockage

thx for the help

 

[nubie]

ahh that would make sense, its funny i cant figure out how to ground a cable up but i can ground a guitar up easily :S severe mental blockage

thx for the help

NP

Always glad to help out technically, since I don't know anything about coding .