Any use for these ICs?

[Olav]

I just took apart the batterycharger for my traffic control trailer. There was a PCB with a couple LEDs in there and I figured I'd strip it for resistors and caps and such. It has a couple ICs in there; one LM2904N, one CD4052BCN, one ULN2003AN, one ST62T10B6-HWD. I checked a couple sources to find out if they could be of any use, the LM2904N is a dual opamp, the CD4052BCN is "Single 8-Channel Analog Multiplexer/Demultiplexer" whatever the heck that means, the ULN2003AN is a high voltage/high current darlington transistor array, mkay? Last but not least, the ST62T10B6-HWD seems to be an analog to digital converter.
Any leads on if these are of any use to a n00b stompbox hack like me? LM2904 is easy, dual opamp... Those other things?

[PStevenson]

it's best to keep these things because you'll get to a point where you're not a noob
I've used all of those ICs at one point or other and they (with the exception of the ST6...) are all useful junkbox components

[Olav]

Thanks Paul, I wasn't planning on binning them. I'm too much of a hoarder. I'll just google some more and see if I can find fun projects with these ICs.