[sdiy] "Curtis" filter in Prophet 8

[David Ingebretsen]

Kind of figured that.

But, it kind of makes me want the Prophet a bit more knowing it is a unique
beast.

I'll have to check the piggy bank under the bed...

Thanks Paul.

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: Paul Schreiber [mailto:synth1 at airmail.net]
~~ Sent: Wednesday, July 22, 2009 11:31 PM
~~ To: David Ingebretsen; synth-diy at dropmix.xs4all.nl
~~ Subject: Re: [sdiy] "Curtis" filter in Prophet 8
~~ 
~~ 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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