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Prahlad J. Purohit
02/08/06 08:08
Read: 1382 times
Mumbai
India


 
#109516 - Zero cross detector led. [ Kai ]
Dear Kai,

I am using zero cross detector for mains zero cross detection. Some products use LM311 comparator where as others use LPC922 internal comparator. Some time back you had suggested this circuit for my LPC922 internal comparators. I remember the red led you had suggested to prevent charge injection from transformer. Now, I want to know is this red led required even with LM311 based comparators the component values are ditto same as you suggested for LPC922 only diffrence is with LM311 i am using +5V single supply where as LPC922 was 3V powered.

Thanks & Regards,
Prahlad Purohit

List of 13 messages in thread
TopicAuthorDate
Zero cross detector led. [ Kai ]      Prahlad J. Purohit      02/08/06 08:08      
   Yes, still required      Kai Klaas      02/08/06 19:50      
      Please Elaborate      Abhishek Singh      02/08/06 21:21      
      Input signal.      Prahlad J. Purohit      02/08/06 21:59      
         CMIVR      Kai Klaas      02/09/06 06:16      
            Input smaller than reference.      Prahlad J. Purohit      02/09/06 06:36      
               yes works      Abhishek Singh      02/09/06 08:07      
               Will work!      Kai Klaas      02/09/06 18:36      
                  Re: Will Work.      Prahlad J. Purohit      02/10/06 07:29      
         are you aware      Erik Malund      02/09/06 06:48      
            Searched entire page.      Prahlad J. Purohit      02/09/06 07:08      
               sorry, it seems to be gone      Erik Malund      02/09/06 07:46      
                  Re: LPCxxx App note.      Prahlad J. Purohit      02/10/06 07:37      

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