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Oliver Sedlacek
02/13/06 06:33
Read: 500 times
Uk


 
#109834 - Opto with capacitor
Responding to: Per Guldmann's previous message
You can use a capacitor as an impedance to control the current into an opto-isolator. It doesn't dissipate any power as it's a reactive impedance. 100 to 220 nF is a suitable range. Remember to put a reverse diode in parallel with the opto LED or to feed the LED through a bridge rectifier because otherwise you will blow it up.

List of 34 messages in thread
TopicAuthorDate
monitoring mains voltage      Per Guldmann      02/13/06 04:38      
   Opto with capacitor      Oliver Sedlacek      02/13/06 06:33      
      re opto with cap      Per Guldmann      02/13/06 07:09      
         Some protective components required      Oliver Sedlacek      02/13/06 09:56      
            Fire risk      Kai Klaas      02/14/06 07:14      
   Transformer        Andy Neil      02/13/06 07:49      
      thats the best chioce      Abhishek Singh      02/13/06 07:51      
      There's nothing wrong      Per Guldmann      02/13/06 08:40      
         Space      Andy Neil      02/13/06 09:32      
   please do not go aargh      Erik Malund      02/13/06 08:48      
      Opto isolator = LDR + Neon?      Andy Neil      02/13/06 09:20      
      10mA?      Oliver Sedlacek      02/13/06 09:53      
         Hmmm      Per Guldmann      02/13/06 10:12      
            Why not...      Steve M. Taylor      02/13/06 17:03      
               Neon + Photodiode      Andy Neil      02/14/06 00:31      
                  Loosing brightness      Kai Klaas      02/14/06 06:05      
   Transformer isolation is needed!      Kai Klaas      02/13/06 19:42      
      Previously, on 8052.com      Andy Neil      02/14/06 00:29      
         Safety first      Per Guldmann      02/14/06 03:11      
            Transformer      Kai Klaas      02/14/06 05:58      
               Sorry      Kai Klaas      02/14/06 07:18      
                  two places to look      Erik Malund      02/14/06 07:26      
                  Annoying, isn't it?!      Andy Neil      02/14/06 08:23      
                     Thanx!      Per Guldmann      02/14/06 08:35      
                        maybe Amveco 6200 series?      Erik Malund      02/14/06 08:37      
                        Transformers      Anders Sandström      02/14/06 11:01      
                     Could also be used      Kai Klaas      02/14/06 10:05      
   an Idea        Mahmood Elnasser      02/14/06 10:42      
      The simplest ideas are the best      Jez Smith      02/14/06 14:58      
         Poor dads      Mahmood Elnasser      02/14/06 23:12      
            Tainted food      Kai Klaas      02/15/06 08:25      
      Yes, but...      Kai Klaas      02/14/06 20:01      
         Low current      Mahmood Elnasser      02/14/06 22:50      
            Exactly!      Kai Klaas      02/15/06 08:40      

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