[sdiy] "Curtis" filter in Prophet 8

[Paul Schreiber]

They were custom for Dave only. Try calling there and ask.

Paul S.

----- Original Message ----- 
From: "David Ingebretsen" <dingebre at 3dphysics.net>
To: <synth-diy at dropmix.xs4all.nl>
Sent: Thursday, July 23, 2009 12:12 AM
Subject: RE: [sdiy] "Curtis" filter in Prophet 8


> Well, then I guess my follow-up question would be can regular people buy
> small quantities of these chips somewhere? Or, would it have been a 
> special
> run for Dave Smith only?
>
> 1. It might be fun to experiment with the chips for SDIY.
> 2. I'm thinking of buying a Prophet 8 and the paranoid in me would want 
> some
> spares should the unit fry.
>
> David
>
>
> David M. Ingebretsen M.S., M.E.
> Collision Forensics & Engineering, Inc.
> 2469 East Fort Union Blvd. STE 114
> Salt Lake City, UT 84121
> www.CFandE.com
>
> 801 733-5458 Office
> 801 842-5451 Cell
>
> dingebre at CFandE.com
> dingebre at 3dphysics.net
>
>
>
> ~~ -----Original Message-----
> ~~ From: synth-diy-bounces at dropmix.xs4all.nl [mailto:synth-diy-
> ~~ bounces at dropmix.xs4all.nl] On Behalf Of JJB
> ~~ Sent: Wednesday, July 22, 2009 6:09 PM
> ~~ To: synth-diy at dropmix.xs4all.nl
> ~~ Subject: Re: [sdiy] "Curtis" filter in Prophet 8
> ~~
> ~~ On the Dave Smith website he mentions somewhere that the Curtis chips
> ~~ used in the Mopho are not New Old Stock, but an actual new run of 
> Curtis
> ~~ chips. Now how does one go about making _that_ happen?
> ~~
> ~~  - Joel
> ~~
> ~~ Antti Huovilainen wrote:
> ~~ > On Wed, 22 Jul 2009, David Ingebretsen wrote:
> ~~ >
> ~~ >> While not strictly DIY, I am curious if anyone knows anything about
> the
> ~~ >> Curtis low pass filter in the Dave Smith Prophet 8 synthesizer? Is 
> it
> ~~ >> using
> ~~ >> Curtis chips or did they re-do the circuit with discrete components?
> ~~ >
> ~~ > My guess is CEM3396, which is basically two half DCos, VC mixer,
> ~~ > CEM337x/338x style filter (similar to OTA even if internally
> ~~ > implemented with some shortcuts) and a final VCA.
> ~~ >
> ~~ > Antti
> ~~ >
> ~~ > "No boom today. Boom tomorrow. There's always a boom tomorrow"
> ~~ >   -- Lt. Cmdr. Ivanova
> ~~ > _______________________________________________
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> ~~ >
> ~~ >
> ~~
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