LM339 Voltage Comparitor Question

Comparitors? Why would I want to know about comparitors? Oh, that's right. I almost forgot. That's what this thread originally started out about. Can't think of anything else I need to know about comparitors at the moment. But let me drum up another IC that I don't know anything about. That shouldn't be too hard for me to do .
 
I was going to offer to also take your next thread off-topic, but I looked back and realized you had done it yourself.
 
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