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???
02/13/06 13:33
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#109834 - Opto with capacitor
Responding to: ???'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            01/01/70 00:00      
   Opto with capacitor            01/01/70 00:00      
      re opto with cap            01/01/70 00:00      
         Some protective components required            01/01/70 00:00      
            Fire risk            01/01/70 00:00      
   Transformer            01/01/70 00:00      
      thats the best chioce            01/01/70 00:00      
      There's nothing wrong            01/01/70 00:00      
         Space            01/01/70 00:00      
   please do not go aargh            01/01/70 00:00      
      Opto isolator = LDR + Neon?            01/01/70 00:00      
      10mA?            01/01/70 00:00      
         Hmmm            01/01/70 00:00      
            Why not...            01/01/70 00:00      
               Neon + Photodiode            01/01/70 00:00      
                  Loosing brightness            01/01/70 00:00      
   Transformer isolation is needed!            01/01/70 00:00      
      Previously, on 8052.com            01/01/70 00:00      
         Safety first            01/01/70 00:00      
            Transformer            01/01/70 00:00      
               Sorry            01/01/70 00:00      
                  two places to look            01/01/70 00:00      
                  Annoying, isn't it?!            01/01/70 00:00      
                     Thanx!            01/01/70 00:00      
                        maybe Amveco 6200 series?            01/01/70 00:00      
                        Transformers            01/01/70 00:00      
                     Could also be used            01/01/70 00:00      
   an Idea            01/01/70 00:00      
      The simplest ideas are the best            01/01/70 00:00      
         Poor dads            01/01/70 00:00      
            Tainted food            01/01/70 00:00      
      Yes, but...            01/01/70 00:00      
         Low current            01/01/70 00:00      
            Exactly!            01/01/70 00:00      

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