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???
06/08/10 15:06
Modified:
  06/08/10 15:09
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 		 #176518 - Required points clarified - thanks
Responding to: ???'s previous message
Michael Karas said:

It is quite fine to attach things to a USB port in order to get them working. I believe that Raghu appears to intend to get his device working as a full USB device.
......

The main thing to be careful about is to not short out or overload the 5V rail coming out of the computer. Some times a short like this can make the computer crash. Other times it will blow a fuse, trip a polyfuse or make a USB port power switch chip detect an overload and turn off the power.


Thanks for explaining my device so well. Yes the data aqcuistion unit is powered by the 5V from USB port.

As to the second point of shorting out the 5V , it already has happened once (Murphy!) and my Sony notebook just shut down power to that USB port.

Since this unit has generated lots of interest, here is the link to the full specs : http://labjack.com/u3/specs

And yes the aspect of the the 5V from the USB port being noisy is worth noting.

Raghu

List of 33 messages in thread
TopicAuthorDate
DC / DC Convertor            01/01/70 00:00      
   OK            01/01/70 00:00      
   that is not possible            01/01/70 00:00      
      Clarification            01/01/70 00:00      
         Select 9-12V with a capacity to supply up to 20mA            01/01/70 00:00      
            I think I see what is needed            01/01/70 00:00      
               Per forgot            01/01/70 00:00      
                  Incorrect....            01/01/70 00:00      
                     incorrect?            01/01/70 00:00      
   Getting power from the USB port            01/01/70 00:00      
      OK for Development            01/01/70 00:00      
         Required points clarified - thanks            01/01/70 00:00      
            trying again            01/01/70 00:00      
         re: OK?            01/01/70 00:00      
            The Curse Of Stuff That "Works" (sic)            01/01/70 00:00      
               USB has provisions for 1.8A from charger ports            01/01/70 00:00      
         I should know better, word of warning            01/01/70 00:00      
            Worse :(            01/01/70 00:00      
               Fuse?            01/01/70 00:00      
                  With picture            01/01/70 00:00      
                     And the external USB connectors?            01/01/70 00:00      
                     Is that really a PC motherboard?!            01/01/70 00:00      
                        Unusual USB connector.            01/01/70 00:00      
                           It all looks a bit "chunky"...            01/01/70 00:00      
                        It's a front panel board            01/01/70 00:00      
                     Both Ports??            01/01/70 00:00      
                        Yes, both ports            01/01/70 00:00      
                           Fusing S/B on main board            01/01/70 00:00      
                           Poor C6...            01/01/70 00:00      
               Bolt that stable door!            01/01/70 00:00      
      Really?            01/01/70 00:00      
         Standby?            01/01/70 00:00      
      RE: Getting power from the USB            01/01/70 00:00      

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