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How to use ULN2003 darlington array?

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Re: uln2003 pic

[H]ackerK said:
Hello World...

Recently I have got some ULN2003 but I need to drive a RGB LED that has a common cathode. :(

I know ULN2981 can do the job, but I don't have any....

Any suggestions?

Added after 37 minutes:

Humm.. How about if I use a negative voltage source? Would that work? Just slightly confuse how to supply +V to my microcontroller now..
Click to expand...

can you share your circuit even i am doing the same thing ,i want to use internal ADC want to convert negative voltage also ,i am driving 25 LEd's thoght to connect directly to pic pins but for that i need to select LED's with less current so i gone for ULN2003 ,but how you are doing negative voltage ?using opamp ?
 

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