Kristoffer Ericson wrote: > I assume only on exist so far? I've made only one version 2 board so far.
> Whats the price for parts For the current version 2 board, you need: - one UBB http://www.tuxbrain.com/en/oscommerce/products/1898 but I would recommend getting a few, in case something goes wrong, if there's a design change in the future, or for some new project: http://www.tuxbrain.com/en/oscommerce/products/1880 - half a male VGA monitor cable (a male-male PC-to-monitor cable yields two such half-cables, a male-female VGA extension cable would yield one) Pretty much any PC shop should have them. They're not very expensive. Here's one for USD 5: http://www.amazon.com/StarTech-6-Feet-Resolution-Monitor-Cable/dp/B000067SMH The bead is already overkill ;-) - resistors: 3 x 82 Ohm 1 x 330 Ohm 3 x 470 Ohm 3 x 1 kOhm I used the 1/8-1/4 W axial through-hole type with a body length of about 3.2-3.4 mm, 5% tolerance. Here's an example: http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=CF14JT330RCT-ND Making a cable-board combo shouldn't take more than 1-2 hours. Most of the work is sorting out the VGA signals. Regarding the choice of components, I picked through-hole to have reasonably large and mechanically solid contacts to which to solder the VGA cable: http://downloads.qi-hardware.com/people/werner/ubb/vga/ubb-vga2-prototype.jpg You could also mix SMT and through-hole, like I did in version 1: http://downloads.qi-hardware.com/people/werner/ubb/vga/ubb-vga-top.jpg In version 1, I used a ribbon cable to connect to a VGA connector: http://downloads.qi-hardware.com/people/werner/ubb/vga/ubb-vga-ribbon.jpg Pro: - easier to keep track of what wire goes where - less mechanical strain on the UBB side Contra: - mechanically fragile - risk of accidental shorts Note that the connection in the image only has two ground connections, because most of the grounds are joined somewhere in the VGA cable. The version 2 board connects all six grounds (R, G, B, Hsync, Vsync, and shield). > or where can one buy it? I haven't figured out a good way to productize it yet. It would be easy enough to make a UBB-like board with SMT components and proper contact pads for VGA, but you'd still have to solder the VGA cable, which is messy work. Such a board could be tightly attached to the VGA cable Alternatively, one could make a two-board combo with plain UBB plus a VGA daughterboard that uses a PCB connector. This would be easier to make but would lack the tidiness of an integrated solution. Another consideration would be how to connect to something that isn't directly a monitor, e.g., a device with a special connector or a cable that goes off to more distant equipment. The two-board approach would have a female VGA connector and would just use whatever cable is already available. The integrated approach would need a gender changer, like this: http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=626-1296-ND - Werner _______________________________________________ Qi Hardware Discussion List Mail to list (members only): [email protected] Subscribe or Unsubscribe: http://lists.en.qi-hardware.com/mailman/listinfo/discussion
