You also need a resistor (or inductor) in front of the divider to avoid turn on transients killing your LED.
personally, I would just buy a low power switchmode led driver such as: http://www.suntekstore.com/goods-14002514-10_x_580-600ma_constant_current_regulated_1x3w_led_driver_.html and use that instead. njh On Wed, Dec 05, 2012 at 01:55:40PM -0200, Roberto Spadim wrote: > i must simulate and test > but like a resistor divider: > > 0 volts ----WWW--| (5 volts) |---WWWW------ 10volts > > you can do it with caps in AC voltage > > > 0 volts ---- |||cap|||----| (110volts) |--|||cap|||---- 220volts > > > must get right values of caps, and use caps for AC voltage (eletrolitic > aren't usefull in AC) > put this divider before resistor and use the same project, you will reduce > voltage with caps, instead a resistor or a transformer, it's very smaller > and more energy efficient > > > > > 2012/12/5 Markus Gaugusch <mar...@gaugusch.at> > > > On Dec 5, Roberto Spadim <robe...@spadim.com.br> wrote: > > > > > 1 watt!!!! that's energy lost in temperature!use a two caps divider and > > a lower resistence > > > > Hi Roberto! > > > > Could you give us an updated schematics? You seem to know what you are > > talking about, while I feel I could be able to understand it when I can > > see it - hopefully :) But at least I would be able to build it ... > > (please also mention values for 230V AC, if you can provide them ...) > > > > thanks! :) > > Markus > > > > > > > > > 2012/12/5 Martin Patzak (GMX) <martin.pat...@gmx.de> > > > Silvano, > > > > > > as Google is my friend, it can be Yours too! > > > > > > Look what I found: > > > > > > http://ruggedcircuits.com/html/circuit__26.html > > > > > > ------------------------------------------------------------------------------ > > LogMeIn Rescue: Anywhere, Anytime Remote support for IT. Free Trial > > Remotely access PCs and mobile devices and provide instant support > > Improve your efficiency, and focus on delivering more value-add services > > Discover what IT Professionals Know. Rescue delivers > > http://p.sf.net/sfu/logmein_12329d2d > > _______________________________________________ > > Owfs-developers mailing list > > Owfs-developers@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/owfs-developers > > > ------------------------------------------------------------------------------ > LogMeIn Rescue: Anywhere, Anytime Remote support for IT. Free Trial > Remotely access PCs and mobile devices and provide instant support > Improve your efficiency, and focus on delivering more value-add services > Discover what IT Professionals Know. Rescue delivers > http://p.sf.net/sfu/logmein_12329d2d > _______________________________________________ > Owfs-developers mailing list > Owfs-developers@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/owfs-developers ------------------------------------------------------------------------------ LogMeIn Rescue: Anywhere, Anytime Remote support for IT. Free Trial Remotely access PCs and mobile devices and provide instant support Improve your efficiency, and focus on delivering more value-add services Discover what IT Professionals Know. Rescue delivers http://p.sf.net/sfu/logmein_12329d2d _______________________________________________ Owfs-developers mailing list Owfs-developers@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/owfs-developers
