What to build with these chips?

[sfr]

Okay, going through my parts bin looking for some stuff, I found an MN3007 and a MN3101 -  These are used together for stuff, right?  I don't know where they came from, I think I pulled them from something, but since they were obviously socketed if they were pulled, they had to either come from a distortion or compressor I got together for 10 dollars (yard sale) and promptly cannabalized (they both sucked) for parts and the enclosures - but that doesn't make sense.  Maybe it was a grabbag from Electronics Goldmine, I dunno.  

Regardless, I hear these chips mentioned here often enough - what's a good project I should build with them?  

Never thought I'd have this problem - I'm always hunting through my parts bin for the one tranny or IC or diode or whatever i don't have. . . .

[BillyJ]

Small clone I guess is one....

http://diystompboxes.com/sboxforum/viewtopic.php?t=977&sid=864d6ff61f7931b3558ed96fa30618ae

[Mark Hammer]

There are a few things you can do with this pair, depending on your needs.

F'rinstance, a single MN3007 can be coaxed into producing 70-100msec delay, which is enough for a decent slapback echo.  If your passions include rockabilly, that's one use for it.  Pretty small parts count too since you don't need an LFO.  You also get around all that de-ticking nuisance that often crops up when using an LFO.

If you already own a flanger, a single MN3007 can be coaxed into generating through-zero flanging by making a blend-box.  The guitar goes into the blend box and a buffer/splitter stage. From the buffer/splitter, one path goes to a pre-existing flanger that can be set to wet-only and has a manual delay time (you can easily mod a BOSS BF-2 to do this).  The other path puts the "straight" channel through a very short (1msec or less) delay.  When this ultra-short delay signal and the modulated signal are mixed back together (via an on-board mixing stage), the notching/comb-filtering/dopplering depends on the time relationship between those two signals, rather than just the flanger's delay time alone.  Listen to the sound samples of the Paradox TZF at Foxrox pedals for an idea of what this can sound like.  The Paradox is a more complex version and a step up in many ways, but a plebian flanger can be coaxed into doing some of the same tricks.

Alternatively, ignore the MN3101 and build a Zombie Chorus.  Has a pleasant tone and is very moddable.