Re: dimmer to variable DC interface

["Petem" <petem001@xxxxxxxxx>]

"B Fuhrmann" <b-fuhrmann-usenet@xxxxxxxxxxxxxxxxxxxxxxxxx> a écrit dans le
message de groupe de discussion :
vfWdna62DZDuDSTUnZ2dnUVZ_tXinZ2d@xxxxxxxxxxxxxxxxxxxx
> Does anyone know of a reasonably simple circuit that can take a typical
> dimmer output and create a DC output from 0 to 24 volts?
>
> This would be used to drive a particular LED board that is designed for
> 24VDC, dims to almost off at 3VDC.
>


Bill a light dimmer cant be used in such a way cause light dimmer dont
really dim the voltage level, it only chop part of the syn wave leaving only
a fraction of the total power passing in the load, creating the effect of
dimming an normal light..

What you need is a variable power supply, that can be set from 3 to 24 volt
dc..

but can you be more precise of what you want to acheive? cause I am not sure
of your goal, do you need a 24 volt source to be set at 3 volt permanently?