[sdiy] "Curtis" filter in Prophet 8

[Graham Atkins]

David,

Don't they call that "built in obsolescence" ?

Graham

On 23 Jul 2009, at 07:02, David Ingebretsen wrote:

> 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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