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?

 

Hello,

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

Greetings,
Bertus