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???
03/24/07 04:46
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 		 #135746 - You can calculate current requirements
Responding to: ???'s previous message
See the datasheets, and don't forget about the currents switched in your various interfaces.

The diodes need to be configured as common cathode with separate anodes for each potential source of supply.

RE


List of 32 messages in thread
TopicAuthorDate
Diverting power supply to battery            01/01/70 00:00      
   Battery?            01/01/70 00:00      
      Picture of 9V battery            01/01/70 00:00      
         Diode OR            01/01/70 00:00      
            a note to the above            01/01/70 00:00      
               AC Adaptor = 12V, Battery = 9V            01/01/70 00:00      
                  5V regulator            01/01/70 00:00      
                     Regulator used            01/01/70 00:00      
               Exactly! But not only a tad...            01/01/70 00:00      
            Can\'t seem to find the 3-pins package            01/01/70 00:00      
               It's an SOT-23 and very common ... see DigiKey            01/01/70 00:00      
                  Still having trouble looking            01/01/70 00:00      
                     how much current?            01/01/70 00:00      
                        Current not measured....yet            01/01/70 00:00      
                           You need to know that!            01/01/70 00:00      
                              Alright, will measure and get back to you asap!            01/01/70 00:00      
                                 Requirement?            01/01/70 00:00      
                                    The situation            01/01/70 00:00      
                                       Alarm            01/01/70 00:00      
                                          Alarm is actually a high output buzzer            01/01/70 00:00      
                                             Buzzer            01/01/70 00:00      
                                                Agree            01/01/70 00:00      
                                       Battery backup for alarm systems            01/01/70 00:00      
                                          Just to make everything simpler...            01/01/70 00:00      
                                             Security system...            01/01/70 00:00      
                                                Student Assignment            01/01/70 00:00      
                                                   a happy 'professor'            01/01/70 00:00      
                           fast switching double diode            01/01/70 00:00      
                           You can calculate current requirements            01/01/70 00:00      
                     description is important            01/01/70 00:00      
   Oh, how often            01/01/70 00:00      
      University project            01/01/70 00:00      

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