Email: Password: Remember Me | Create Account (Free)

Back to Subject List

Old thread has been locked -- no new posts accepted in this thread
???
03/23/07 18:47
Read: times


 		 #135696 - fast switching double diode
Responding to: ???'s previous message
Eugene Yong said:
Can i use a fast switching double diode with common cathode to implement this?

Sure - if the current rating is sufficient.
Remember to include the inrush surge when you power-up from dead on mains power...

The switching speed will not be an issue here!

More important is forward voltage drop - especially when running on battery.
Although maybe not if you're using a linear regulator - see: http://www.8052.com/forum/read.phtml?id=135679


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      

Back to Subject List