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PostPosted: 13.01.2008 23:57 
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Junior Modder
Junior Modder

Joined: 13.01.2008 23:54
Posts: 2
Hi all, I would like to light up the interior of my case using 9 ultra bright LEDs, with some help I came up with the following

Image

But I would like to know how to make this fade on and off as opposed to just blinking when in standby mode, any ideas?


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PostPosted: 14.01.2008 08:34 
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Site Admin
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Joined: 24.01.2002 10:09
Posts: 4683
Location: Finland
Can't see the image but many of us have used this circuit to fade the power led:

Image

Colorfade article

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PostPosted: 14.01.2008 12:08 
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Junior Modder
Junior Modder

Joined: 13.01.2008 23:54
Posts: 2
could you explain that a bit more? and I need 9 leds each with 3.5v draw, so im not sure that would work.


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PostPosted: 10.09.2008 06:14 
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Regular Modder
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Joined: 26.05.2007 10:06
Posts: 128
Location: Texas
Can you tell me what the NPN does here. And also, (I think I am finally getting it) can you tell me if the little arches mean that the wires GOES OVER the other wires. (Or basicly that they do not touch the other wires.


Thanks,


Dan


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PostPosted: 10.09.2008 14:21 
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Regular Modder
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Joined: 02.11.2006 19:30
Posts: 249
DanTheMan wrote:
...can you tell me if the little arches mean that the wires GOES OVER the other wires. (Or basicly that they do not touch the other wires.

Thanks,
Dan


That's right, the line "jumps" over another line without touching it. Sometimes (usually) lines are just drawn across each other (if other way isn's possible) and if lines are supposed to be connected, dot will be drawn there, where lines connect (like those red dots in Japala's picture).

And that NPN transistor... Too lazy to check is lm324's 1st pin output (according to that picture, it looks like it is). Usually npn transistor is used, if for example led that you want to control with IC needs more current than IC can give.

http://metku.net/index.html?path=mods/s ... /index_eng there's some info of transistors
http://www.kpsec.freeuk.com/trancirc.htm there are lots of info...
You might allready know these things, but there's some other problems with that npn in that circuit....but just in case you don't, those articles looked like good articles.

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