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Old 06-07-2008, 09:37 PM #1
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Default Circuit Help

Well the goal of my project is to make an LED strobe light with IR LEDs. (Its for an effect in an independent film) but I also want to be able to use the same strobe as a IR flood light for the same film. I want to run 40 LEDs in the array with 1 indicator LED. Looking for the strobe to be adjustable with 10-15 hertz as a goal. My thoughts were to run it off of a 9 volt battery... I plan on using these LEDs http://www.dealextreme.com/details.dx/sku.2399 but they don't have specs listed. So i guessed at 1.5v sucking 20ma. I attached my thoughts for the circuit, do you see any problems with it?
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Old 06-07-2008, 11:42 PM #2
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Default Re: Circuit Help

When you switch to CW, The current will be higher because you won't have the Vdrop of the Darlington driver.

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Old 06-07-2008, 11:46 PM #3
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Default Re: Circuit Help

C2 ought to be a much larger value (~100uF) C2 is a filter cap, and in my experience, the 555 makes a LOT of noise on the supply without a decent sized capacitor; enough to actually cause it to reset itself.

You might also want an on/off switch, but otherwise I see no glaring problems.
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Old 06-08-2008, 02:24 AM #4
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Default Re: Circuit Help

Thanks for the input! Yeah i was already planning on an on/off switch but i forgot to write it in and didn't wanna redo it... now if someone wanted to print up a PCB, that would be great joking : thanks again.
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