[sdiy] Omni chorus

[jhaible]

Nice Chorus. Not as nice as the Solina IMO, but different.
I chose the Omni chorus for my own polysynth project, too:
http://www.oldcrows.net/~jhaible/polykorg/jh_polykorg_clone.html
http://www.oldcrows.net/~jhaible/polykorg/jh_polykorg_ens1.pdf
http://www.oldcrows.net/~jhaible/polykorg/jh_polykorg_ens2.pdf
(slightly different from original, but not much.)

Take a looke here for the original:
http://scallion.cs.umass.edu/pbrown/arp/

JH.



-----Ursprüngliche Nachricht-----
Von: Gene Stopp <gene at ixiacom.com>
An: <>
Gesendet: Donnerstag, 18. Dezember 2003 23:33
Betreff: RE: [sdiy] Omni chorus


> I had an Omni once - boy did that thing piss me off. The
keying-or-something
> capacitors for each key started going bad one by one, so every time I'd
turn
> around there would be another stuck note. So I cannibalized it and jumped
up
> and down on the circuit boards. Of course I did this after I scavenged:
>
> * A nice 49-note Pratt & Read keyboard
> * A +/-15 volt nicely regulated power supply
> * An ARP potted VCF module to replace a bad one in an Odyssey
> * Some replacement sliders to add to my ARP parts stash
> * The chorus board which I turned into an effects box
>
> I honestly don't remember if I got the TOG chip out - if it was a 50240
then
> I would have definitely grabbed it and put it in the chips drawer.
>
> The chorus board is great. Run a D-50 or OB-8 into it, and you can get
some
> pretty thick stuff going on. It is definitely too noisey to bring up on a
> Front-of-House PA, so I added a simple noise gate. Don't think I ever
wrote
> down the schematic, however.
>
> I would say that $50 is good for the keyboard assembly, alone.
>
>
> Best Regards,
>
> - Gene
>
> -----Original Message-----
> From: Tim Parkhurst [mailto:tparkhurst at siliconbandwidth.com]
> Sent: Thursday, December 18, 2003 1:52 PM
> To: synth-diy at dropmix.xs4all.nl
> Subject: [sdiy] Omni chorus
>
>
> So here's a question for the group: If I can get a semi-working ARP Omni
(Mk
> I) for about $50US, would it be worth the effort to gut the thing for the
> chorus unit? Basically would it be worth it in terms of sound quality, and
> the effort required to remove the chorus circuitry and add voltage control
> to some parameters. I could yank that circuitry out, put it behind a
modular
> panel, and still have the top-octave chips to play with. Whaddaya all
think?
>
>