Stepdown 240v a.c to 5v d.c using resistors...etc

Discussion in 'General Electronics Chat' started by MAT_THE_MOUSE, Jan 19, 2010.

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  1. MAT_THE_MOUSE

    Thread Starter New Member

    Jan 19, 2010
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    Sorry to be a pain, this question has probably been asked before...

    Basically I want to run a 12v or a 5v d.c LED lamp from a 240v a.c supply for testing purposes.....
    Can this be done using resitors, caps, diodes......etc instead of using a transformer?

    I have a 5v 30mA LED lamp I can use at hand.......(if the info is of use to you to do the maths)

    I am an Electrician by trade so I know most of the maths side............Am I right in thinking that a 8000 ohm resistor in series with step it down to about 5v a.c to allow 30mA to flow in the above stated LED lamp I have?
     
  2. bertus

    Administrator

    Apr 5, 2008
    15,648
    2,347
    Hello,

    We do not allow circuits that are directly connected to the mains.
    Please use a transformer to bring down the voltage.

    Greetings,
    Bertus
     
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