[sdiy] "Curtis" filter in Prophet 8

[David Ingebretsen]

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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~~ > Synth-diy mailing list
~~ > Synth-diy at dropmix.xs4all.nl
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~~ >
~~ >
~~ 
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