> Expense. A USB cable is cheap and that eliminates the DC-DC converter > cost since the power is coming from the proper side of the optos. > > But w/ cheap comes low reliability? The USB can be power up/down by the host. A USB fault will turn the power off. I don't know if a fault on another channel turns them all off or not. Would be bad if you plugged a bad usb key in and crashed the running machine. I know w/ my phone plugged into my work machine to charge (admittedly win7), the charging restarts once in a while. Not sure if its the phone (android) or something going on w/ the usb port.
Little dc/dc converters or wall-warts power supplies are cheap too;) Probably better just to grab 5V directly off the PCs power supply than to use USB. Wire up a cable to plug into a spare floppy/CDR power connector. SMD ------------------------------------------------------------------------------ For Developers, A Lot Can Happen In A Second. Boundary is the first to Know...and Tell You. Monitor Your Applications in Ultra-Fine Resolution. Try it FREE! http://p.sf.net/sfu/Boundary-d2dvs2 _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
