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03/26/12 13:51
Read: 698 times

#186895 - How safe is safe?
Responding to: Andy Neil's previous message
I do agree that this is probably the most unsafe design that one can dream up, but when safety is concerned how far do you go?

So, a transformer is used with the AC mains. Do you stop there?
A fuse is placed at the input to the transformer.
A fuse is placed at the output of the transformer.
A real rectifier circuit is used to create some means of DC from the AC transformer.
A regulator is used after at the DC end.
The regulator can be further made safe with the use of diodes.
Each component that the regulator sees can use a 0 Ohm resistor fuse.

Most hobbyists stop with just the transformer powering a regulator. Is that safe? I tend to stop where the regulator cannot fail, but individual components will fail. I also try to buy power supplies that have a slew of their own safety prevention protocols.

Even when individual components fail, there is a risk of an explosion or fire because of the amount of power involved will exceed the maximum rating to be considered flame proof.

It is fair to mention what is considered safe other than saying that it is not safe. You could even go as far as the type of terminals used to connect to AC mains.

List of 26 messages in thread
555 Timer for AC      Chico Magalh„es      03/23/12 15:42      
   "a circuit I got in the internet..."      Andy Neil      03/24/12 00:44      
      Tests      Chico Magalh„es      03/24/12 01:25      
         Then leave AC mains well alone!!        Andy Neil      03/24/12 05:11      
         then why did you put it together        Erik Malund      03/26/12 06:57      
            a recipe for disaster        Andy Neil      03/26/12 12:38      
               How safe is safe?      Justin Fontes      03/26/12 13:51      
                  HUMANLY safe      Erik Malund      03/26/12 13:57      
                     I would also add      Justin Fontes      03/26/12 14:21      
                        A good link to electrical safety      Justin Fontes      03/26/12 20:28      
   You dally with danger again!        Kai Klaas      03/24/12 06:58      
   the value of a human life ....      Erik Malund      03/26/12 13:02      
      An unsafe bodge for a basically unsuitable design!      Andy Neil      03/26/12 13:24      
   So this circuit cant work?...      Chico Magalh„es      03/26/12 22:03      
      How much do you understand?      David Prentice      03/27/12 01:07      
      How do you know you know enough?      Per Westermark      03/27/12 01:16      
      already answered      Erik Malund      03/27/12 06:09      
      Capacitor power supplies...        Kai Klaas      03/27/12 17:03      
         the bane of the high voltage amateur      Erik Malund      03/28/12 07:03      
            Just 24V isn't enough      Per Westermark      03/28/12 07:53      
      You are contradicting yourself!      Andy Neil      03/28/12 14:11      
   RE: 555 Timer for AC        Hans Van Pelt      03/27/12 02:48      
      Triacs      Andy Neil      03/28/12 14:08      
   I'm giving up        Chico Magalh„es      03/28/12 21:25      
   Re      Ramesh Rai      04/18/12 21:03      
      Don't hijack threads      Andy Neil      04/18/12 23:14      

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