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Capacitor Voltage Values - theory only

Discussion in 'General Electronics Discussion' started by dc11, Jun 23, 2013.

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  1. dc11


    May 16, 2011
    Hi all,

    I've implemented the following circuit successfully controlling a 12v lamp. I'd just like to improve my understanding though.

    This circuit (from MOC 3020 AN) is based on 240V AC but it works perfectly with my 12V AC supply.

    1 - what would the voltage values of the 2 capacitors need to be if it was using 240V and how is this calculated?
    2 - what would the watt rating of the resistors need to be and why?
    3 - would the current draw of the load make a difference to those calculations?

    Thanks in advance.

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