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Full Wave 12v Rectifier Help

Discussion in 'General Electronics Discussion' started by jonesi100, Mar 25, 2014.

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  1. jonesi100


    Mar 25, 2014
    I need some help building a full wave bridge rectifier. I need to install a resistor(s) (apparently) to get potential difference, but I don't treacly understand why. Anyway, without explaining the physics, please could anyone tell me what resister value in Ohms and what wattage value would I need if I installed a resister in position R0, before the LED's (all of which are 1.8w and approx 160mA), or should I install a resister at positions R1 R2 and R3.
    Ideally, I just want one, but can you advise on the specs please and how to calculate if the LED ratings change?
    Please look at attached diagram

    Attached Files:

    Last edited: Mar 26, 2014
  2. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    Jan 21, 2010
  3. jonesi100


    Mar 25, 2014
    Hi Steve

    Thanks for your reply. They are in a cooker hood and the 1st bulb (currently all G4 halogens) rectifies the rest. I cannot get inside the hood, only the lamp holder. I bough DC LEDs, not realising it was an AC supply. Any advice appreciated.


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