ULN 2003 and common anode issues.

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Packocrayons

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I have a ULN 2003, and common anode RGB LED's, I know technically this won't work, but is there any way to make it work? I have to work with what I have here. I'm thinking of possibly using mosfets to drive the led's, but I really don't think it's worth the effort seeing as they would have to be removed from another PCB.
Any other options for doing this easily? I do have a few transistors lying around but I don't know whether they're PNP or NPN, and I don't think they would be able to put out the full 1200 ma that the LED's draw.
 

Packocrayons said:
I have a ULN 2003, and common anode RGB LED's, I know technically this won't work,...
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Why not? What's the problem?

ULN 2003 is an NPN Darlington array. No reason it can't drive common anode LEDs.
 

Maybe my terminology is incorrect, I always mix up cathode and anode. They're common GROUND LED's and I want to have control over each one separately, seeing as the ground of each LED would go through the darlington's, they would all end up being attached together.
 

If you want high side switches (like for the anodes of a common cathode display) then you can use **broken link removed**
 

Thanks, I know I need high side drivers, I was just trying to do this without spending any money. I'm only 16 and this is going on a 200$ quad I'm building and I still need to get an FPV system for it.
I'm assuming those work basically the same as the darlington's except they're high side and the common ground becomes a cathode?
 

I've been looking around (mostly on ti). Anyone know where I can get high side switches as free samples?
 

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