understanding leds on ac

Discussion in 'The Projects Forum' started by Sharpen047, Nov 19, 2012.

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  1. Sharpen047

    Thread Starter Active Member

    Apr 19, 2012
    Hey guys ive managed to get a working lamp using this instructable.
    I was wondering if anyone knew how the values were found.id also like to know how to make one with say red or amber leds but would rather calculate it myself.
    Any help would be great.
    current leds are 3.3 vf and the reds are 1.9.

    Last edited by a moderator: Nov 19, 2012
  2. tshuck

    Well-Known Member

    Oct 18, 2012
    I'd suggest reading the TOS:
    specifically, section 6...
    Last edited: Nov 19, 2012
  3. Georacer


    Nov 25, 2009
    You must realize that the schematic that you link to is a lethal hazard to yourself and those around you. Plugging any electronic circuit directly to the mains, without an isolation transformer AND a fuse is an accident waiting to happen.

    Always use an isolation transformer and a fuse while experimenting with live current.

    Specifically for LEDs, it is a very bad idea to link them like that, as one faulty LED can cause the other to collapse too and cause a short on your house circuitry.
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