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???
03/15/12 07:11
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 		 #186682 - Definitely better with lower voltage design
Responding to: ???'s previous message
Yes, you are expected to get a very high voltage over the capacitor with this design.

And yes - it really is not a very safe design even if the series capacitor will limit the available current a bit.

You can use a PC PSU but it does not have any constant-current functionality so you would end up with lots of 12V chains that must either have a constant-current source or at least a series resistor.

It might be better to look for a power adapter for a laptop that gives 18-24V just so you can get more diodes/chain. Of course, this depends a lot on what is available for a good price where you live.

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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