What to do with a whole bunch of LM324N's

[Copyhat]

Hello guys, this being my first post (been lurking for some time though) I want to ask some questions.

I have been given hundreds of integrated circuits by my physics teacher, most of them being 4000-series CMOS and other digital gates/counters (7400, 555 timers, 74LS47 BCD-7 segment LED display IC, 7408N, 7432N, 7486N and so on.)

I have also found about 25 LM324N's, which are the quad version of the old LM741 as far as I know. I have quite a bit of soldering experience and want to build some useful pedals to add to the collection; maybe the 324's can be used in a DOD250-style overdrive or maybe a lo-fi toob screamer? I have also seen a giant schematic of a phaser using 11 op amp sections! I will built all my projects on either veroboard or perfboard, dependent on which layout is easier to figure out 

Maybe some of the other IC's comes in handy in a chorus/compressor/tremolo pedal?

Best regards, Copyhat

[amptramp]

The LM324 is not similar to a 741 because it was designed from the beginning as a single-supply op amp.  The input common mode range goes all the way down to the negative rail.  Other than that, it has relatively poor specs for audio as far as noise and bandwidth are concerned.  But this is not necessarily important in all applications as we generally do not need the ultimate in performance.  The low bandwidth may not hurt and may actually help in fuzzes and other circuits where a large harmonic content is produced.  But if you don't like the performance, drop in a TL074 because they are pinout campatible.

[Mark Hammer]

LM324's would be useful for an 8-stage phaser.  There is also a circuit in the Boscorelli Stompbox Cookbook that uses all 4 sections of a 324 in series for what are apparently some rather unique soft clipping characteristics.