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???
03/20/10 15:05
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 		 #174351 - "empirical" learning...
Responding to: ???'s previous message
... is all very well, but it helps to understand the principles behind what you're "testing"

The International Rectifier site has a lot of good material; eg, Power MOSFET Basics

Note that "normal" bipolar transistors are, essentially, current-driven, whereas FETs are, essentially voltage-driven...

List of 120 messages in thread
TopicAuthorDate
IRF640 noob test            01/01/70 00:00      
   Gate current            01/01/70 00:00      
   "empirical" learning...            01/01/70 00:00      
      read the material...            01/01/70 00:00      
         I believe he is using a MOSFET here            01/01/70 00:00      
            kit            01/01/70 00:00      
               It is DC output            01/01/70 00:00      
               POOF BOOM            01/01/70 00:00      
   what about this circuit?            01/01/70 00:00      
   IRFZ48N and a circuit, this one can fit?            01/01/70 00:00      
      A little bit easier link            01/01/70 00:00      
         Thanks Per            01/01/70 00:00      
            The longest road from a to b            01/01/70 00:00      
               The problem is...            01/01/70 00:00      
                  Sorry            01/01/70 00:00      
                     Hope, you will find the time...            01/01/70 00:00      
                        RGB Controller            01/01/70 00:00      
                           do you need it that bright            01/01/70 00:00      
                              Bar and some info            01/01/70 00:00      
                                 sure you can            01/01/70 00:00      
                                    Hard to adjust intensity by changing voltage            01/01/70 00:00      
                           Simple scheme...            01/01/70 00:00      
                              Very nice!            01/01/70 00:00      
                                 HC32 and not KTC32            01/01/70 00:00      
                                 Answers...            01/01/70 00:00      
                                    maybe another CI?            01/01/70 00:00      
                                       Yes most hc is ok            01/01/70 00:00      
                                          Same HCs to switch ULN2803?            01/01/70 00:00      
                                       Logic Level MOSFET            01/01/70 00:00      
                     you can - wth a caveat            01/01/70 00:00      
   Can I ask a color question?            01/01/70 00:00      
      Start a new thread            01/01/70 00:00      
         Interpolate in RGB or HSV but not in your tabulated index.            01/01/70 00:00      
            linear interpolations...            01/01/70 00:00      
               Standard interpolation            01/01/70 00:00      
                  that depends            01/01/70 00:00      
         right subject            01/01/70 00:00      
      your premises are wrong            01/01/70 00:00      
      If you answer a question...            01/01/70 00:00      
         Just tests, no MOSFETs yet...            01/01/70 00:00      
            The ULN2803 will ruin your colors!            01/01/70 00:00      
               when doing color            01/01/70 00:00      
               miss the point... the point is the color generation...            01/01/70 00:00      
                  Help with what?            01/01/70 00:00      
                  already answered            01/01/70 00:00      
                  Have you seen my link?            01/01/70 00:00      
                     Yes, but dont helps...            01/01/70 00:00      
                        as usual            01/01/70 00:00      
                           not "SPECIFIC, SPECIFIC, SPECIFIC"            01/01/70 00:00      
                              Use another look-up table...            01/01/70 00:00      
                                 Thats it!            01/01/70 00:00      
                                    Copy from a professional solution...            01/01/70 00:00      
                                       Youtube has some nice videos...            01/01/70 00:00      
                              you've got it wrong and what are you doing            01/01/70 00:00      
                                 I care Erik!            01/01/70 00:00      
                                    why are you "going through steps"?            01/01/70 00:00      
                                       Kai videos?            01/01/70 00:00      
                                          Already been told            01/01/70 00:00      
                                             HSV            01/01/70 00:00      
                                                Now I'm confused            01/01/70 00:00      
                                                   Still never telling what you do want            01/01/70 00:00      
                                                      you are going for an intensity ratio ...            01/01/70 00:00      
                                                      I see no contradiction...            01/01/70 00:00      
                                                         I think it was incrementing of the index that was the proble            01/01/70 00:00      
                                                            Chico, are you getting it            01/01/70 00:00      
                                                               Words            01/01/70 00:00      
                                                                  He should have enough information now...            01/01/70 00:00      
                                                                     that is often the problem ...            01/01/70 00:00      
                                                                        Words fail me...            01/01/70 00:00      
                                                                  How to add            01/01/70 00:00      
                                                                     You don't have paletted device so stop thinking about index            01/01/70 00:00      
                                                                        only 125 colors            01/01/70 00:00      
                                                                           Smooth? Sudden? This make no sense!            01/01/70 00:00      
                                                                              I'm tired from guessing, Chico...            01/01/70 00:00      
                                                                           So you haven't read what we have posted?            01/01/70 00:00      
                                                         Thats it Kai...            01/01/70 00:00      
                                                            place my 125 unchangeable colors in a nice sequence in this            01/01/70 00:00      
                                                               Lacks words for me!            01/01/70 00:00      
                                                                  You need more levels.            01/01/70 00:00      
                                                                  See previous suggestions!            01/01/70 00:00      
                                                            only 32 words            01/01/70 00:00      
                                                            what is "nice sequence"? and for what purpose?            01/01/70 00:00      
                                                            A Color Sequence            01/01/70 00:00      
                                                               Gives color jumps            01/01/70 00:00      
                                                                  Missing backslash in previous post            01/01/70 00:00      
                                                                  Look at the example cited earlier            01/01/70 00:00      
                                                                     not a good one            01/01/70 00:00      
                                                                        Starting point?            01/01/70 00:00      
                                                                           my thought is            01/01/70 00:00      
                                                                              Did I get you?            01/01/70 00:00      
                                                                                 sort of            01/01/70 00:00      
                                                                                    Thanks!            01/01/70 00:00      
                                                                                    You are so full of yourself...            01/01/70 00:00      
                                                                                       "web safe" colors available in standard VGA color palette            01/01/70 00:00      
                                                                                          right, you compensate for this by ...            01/01/70 00:00      
                                                                                             Note that candela hides the eyes spectral response            01/01/70 00:00      
                                                                                                true, and            01/01/70 00:00      
                                                                                                   But he doesn't want his solution to be better - just differe            01/01/70 00:00      
                                                                                                      I give up suggesting better and simpler ...            01/01/70 00:00      
                                                                                       with "binary weighing" he gets 32738 colors            01/01/70 00:00      
                                                                                          Number of colors            01/01/70 00:00      
                                                                                             for a LED sign: none            01/01/70 00:00      
                                                                                             Solve modulation first, then bother about constant-intensity            01/01/70 00:00      
                                                                                                not if you do as I suggested            01/01/70 00:00      
                                                                                                   You'll see a lot if slow-stepping changes            01/01/70 00:00      
                                                                                       How naive I was...            01/01/70 00:00      
                                                                                          I do not know, but ...            01/01/70 00:00      
                                                                                             I still say...            01/01/70 00:00      
                                                                                          Everything depends on needs - simplification often ok            01/01/70 00:00      
                                                                                             Gamma            01/01/70 00:00      
                                                                                             If I were Chico...            01/01/70 00:00      
                                                                     Another Color Sequence...            01/01/70 00:00      
                                                                        Yet another sequence...            01/01/70 00:00      
                                                                           another (better) approach            01/01/70 00:00      
                                                               Oops....Sawtooth File Deleted            01/01/70 00:00      
                                                                  On its way...            01/01/70 00:00      
                                                                     Received and RePosted            01/01/70 00:00      
                                                                        RE: wake up the cat            01/01/70 00:00      
                                                                           Walking the RGB cube as described earlier            01/01/70 00:00      
                                                                              the way to do it            01/01/70 00:00      

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