Re: Newbie question: circuit for harddrive indicator
From: Don Taylor (dont_at_agora.rdrop.com)
Date: 01/06/05
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Date: Wed, 05 Jan 2005 19:58:41 -0600
"fob" <rwinder@cameron.net> writes:
>I want to light up an ultra violet reactive 120mm computer case fan
>with UV LED's whenever my harddrive is accessed.
>I figure that I will use 3 UV LEDS to light up the fan, and the 3 LED's
>will be activated by a transistor that is triggered off of the computer
>motherboard's harddrive LED connector.
>Problem is that I don't have any idea how to do this. I figure I will
>need to power it off of a molex connector from the power supply (5v or
>12v) and use a combination of resistors, a transistor and maybe other
>stuff (like caps and/or a voltage regulator). I do know that LED's are
>2.4v devices and are polarized.
>Has anyone seen this type of circuit or know how to make one?
>Thanks for any help you can provide.
For a first project, when you are a little uncertain about whether
your project might damage something in the computer, how about this?
What if you used a light sensor, say a phototransistor, that would be
illuminated by the light from your harddrive led? The phototransistor
acts sort of like a switch, when the light is on it the switch is
closed, no light and the switch opens. That can then be used to turn
your transistor on and off. And the transistor can turn on and off
enough power to switch your 3 uv leds on and off. All this could be
tested without risking wiring it to your computer, so worry can be
reduced, always a good thing with a first try at something.
Sound like a reasonable approach? Then wen can move on to the next step.
- Next message: John Popelish: "Re: High power PNP question"
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- In reply to: fob: "Newbie question: circuit for harddrive indicator"
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