[Diy_efi] Re: diy_efi Digest, Vol 17, Issue 46

[Bill Washington]

Karl,
    The problem is not so much with the idea, or the LED, as with the 
Human Eye - consider how a TV or cinema film works - 50 or 60Hz frame 
refresh rate of slightly varying still shots gives apparent movement - 
the reason - the human eye has a persistence of about 1/50 of a second - 
slightly longer actually - so if the LED is switching on and off slower 
than that we will see a flicker, if it is faster than that all we will 
see is a perceived change in the brightness of the LED, so with this 
understanding and these constraints your Idea is useable.
    So don't be afraid of being flamed - we all get it, but floating 
new/different ideas whether or not they have immediate application has 
merit - even if they may not work as proposed, they do serve to make 
people think outside the square, and that is always useful.

Regards
Bill

>------------------------------
>
>Message: 2
>Date: Sat, 26 Feb 2005 11:05:25 -0800
>From: "Karl Walter" <krw at efn.org>
>Subject: Re: [Diy_efi] pulse readings:  correction.
>To: "A list for Do-It-Yourself EFI" <diy_efi at diy-efi.org>
>Message-ID: <001d01c51c36$21943560$010aa8c0 at waltechii>
>Content-Type: text/plain; charset="iso-8859-1"
>
>
>  Hello,
>
>  The LED needs an 800 ohm balast resistor for 5 volt pulses.
>
>  I am sorry for not providing accurate information in my previous post.  I just figured it was a nice opportunity to share a "quick trick" I use. 
>
>  W.S. Cowell seems to think my post was "misleading" and "nonsense"  Does everybody else on the list feel this way too? I usually give the E-mails a quick read, and I have been hesitant to post something that's not a question.  I just threw out an idea, brainstorm style, and now I feel that I should not post unless I have a guarenteed, tested, and 100% accurate answer.  
>
>  To All, should I be afraid to post replys to this list?  Do you want to  read my sometimes not fully thought out ideas, or should I just shut up?  Threads don't stay around long usually, So if a quick answer that might be wrong isn't OK, I probably won't be able to get a reply off before the origional question is long gone.
>
>
>  
>
>
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