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???
02/29/12 18:10
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 		 #186290 - Yes, very likely a failure
Responding to: ???'s previous message
Erik Malund said:
Some capacitors (not all) can survive the polarity reversal as long as the polarity isn't permanently reversed. They fail quickly if they have a reversed DC potential.
then the lower of the two caps on the DC side will go POOOOOOOOOF

that cap, in my opinion, should be enough for everyone to go "WHAT" and look for some other solution.

Erik

That is very likely. I have never seen that design on a DC circuit. Only for AC.

Not all circuits found on the net are good circuits. Many of them have not even resulted in any working product - the project died half-way with design material that might look ok but are 100% untested.


List of 27 messages in thread
TopicAuthorDate
AC Powered LEDs + strobe            01/01/70 00:00      
   Isolated Switch            01/01/70 00:00      
      Switching            01/01/70 00:00      
   Some basics            01/01/70 00:00      
      Not a good design - and expensive            01/01/70 00:00      
         Answers + need some explantion            01/01/70 00:00      
      Cap voltage            01/01/70 00:00      
         More than 280V            01/01/70 00:00      
            Measurement            01/01/70 00:00      
               Measurement correct            01/01/70 00:00      
   two caps polarity reversed on DC!! ?            01/01/70 00:00      
      More common long time ago            01/01/70 00:00      
         I was around then            01/01/70 00:00      
            Some polarized capacitors survives AC but not reversed DC            01/01/70 00:00      
               POOOOOOOOOF            01/01/70 00:00      
                  Yes, very likely a failure            01/01/70 00:00      
                     that need bold face            01/01/70 00:00      
            Back to back connection...            01/01/70 00:00      
   And another thing...            01/01/70 00:00      
      Pseudo-CC with resistor requires much % V over resistor            01/01/70 00:00      
      chip            01/01/70 00:00      
         one of these            01/01/70 00:00      
         Chips            01/01/70 00:00      
   PC PSU            01/01/70 00:00      
      Definitely better with lower voltage design            01/01/70 00:00      
         PSU            01/01/70 00:00      
            Some bricks can inform about rating            01/01/70 00:00      

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