Salve Derek! nice idea :)
On Mon, 22 Jan 2007, Derek Pressnall wrote: > I realize that the reason the usb host port is unpowered is because > the phone runs at something like 3.6 volt, and powered usb requires 5 > volt, which would add the need for dc-dc converters. So, I've got an > idea... and another, someone could play with usb flash-memory and lower the power suply of this usb device down to 3.6 volt. I could imagine, that it will still work. > What about adding a power tap next to the usb port, running at the > phones native voltage? So under the battery cover we could place a small switch to give 3.6 volt to the usb connector - maybe together with a small red led to warn (when warning is neccessary). Next hack - using a cheap usb flash-memory and spend this memory a mini USB connector fit into Neo1973. > This should only be a matter of adding an > additional connector (and possibly protection circuitry). Then, an > adapter cable can be manufacured seperately that has a usb mini-A and > power tap connector on one end, and a full-sized usb-A on the other, > with the dc-dc circuit inbetween? This way, it leaves the potential > for powered external devices without complicating the phones > circuitry. Of course I realize that can't be included in the first > production run, but possibly an idea for the followon product. But you could influence some hardware hackers, can't waiting untill Neo1973 v.2 ;) Happy hacking, rob _______________________________________________ OpenMoko community mailing list community@lists.openmoko.org https://lists.openmoko.org/mailman/listinfo/community
