practical DIY whammy?

[jbm222]

That is, like the digitech whammy tom morello uses.  Given an old volume/wah enclosure, are there any designs out there that can be built a DIYer?  If such a thing exists, I'm not terribly worried about the number of parts as long as it would fit in an average sized enclosure.  I'm more concerned about stuff that would be impossible to get (like if they have some sort of PROM in them, programmed by digitech), or things that would be difficult have functioning properly (like if a capacitor value requires 0.01% tolerance for it to work).

[PCS]

http://sound.westhost.com/project49.htm

Surely you can replace the LFO portion with a variable resistor?

[The Tone God]

The "Search" function is your friend.

http://www.diystompboxes.com/sboxforum/viewtopic.php?t=29074

http://www.diystompboxes.com/sboxforum/viewtopic.php?t=31784

Andrew

[cd]

The "Search" function is your friend.

http://www.diystompboxes.com/sboxforum/viewtopic.php?t=29074

http://www.diystompboxes.com/sboxforum/viewtopic.php?t=31784

Andrew

Dang, you beat me to it

There's a great post by Mark Hammer somewhere that explains the only two practical DIY methods for pitch shifting: IIRC (1) is octave doubling with various methods (FWR, transformer, MOSFET, etc.) (2) is octave dividing using CMOS.  Besides that, fuggedaboutit.