Yamaha CS80

Excellent news!  Keep the group informed - lots of potential customers 
here!

Of course, this all begs the question of a complete M-Card replacement...

  David

p.s. - for the M-Card replacement, I'd like additionally selectable 
Oberheim SEM and Moog Ladder (904A AND Minimoog while I'm asking...) 
filters. And don't tell me you haven't thought of (and possibly 
prototyped) this :)   Also much nicer trim pots for tuning and 
calibration - assuming it doesn't have built-in auto-cal!

> The Old Crow <mailto:oldcrow@...>
> November 14, 2011 1:26 PM
> Hi David,
>
> The VCO153 and GX1BPF will be assembled 5U-format modules I will be
> offering myself, though my company. The IG153 (retrofit board for
> IG00153 chip) and JH151 (retrofit for IG00151) are likewise
> pre-assembled SMD boards for use in replacing those custom ICs, and will
> be offered probably around March 2012. I will also have a small board
> for replacing CA3080 OTAs with a small discrete OTA cell and a board for
> offering a dual matched NPN (or PNP) pairs with an included 1K 3300ppm
> thermal-contact resistor, both boards having a DIL-8 pinout.
>
> The modules can use a Moog-style front panel if so desired, though
> you would need to get the panels made/lettered--Arrick sells the
> blanks. At some point I might offer a frac-rack version--we'll see.
>
> Someone asked about replacing the EG chips. This is somewhat more
> complicated in that it is hard to get that many parts into a retrofit
> board that would fit reasonably into an IG00152/159 socket location.
> But, I have a solution that involves using a microcontroller to do the
> envelopes with high enough resolution one cannot tell the functions are
> computed in the discrete time domain instead of the continuous time 
> domain.
> We'll see.
>
> Regards,
>
> Scott Rider
> http://www.cs80.com/
> /**/
>
>
>
> ------------------------------------
>
> Yahoo! Groups Links
>
>
>
> David Rogoff <mailto:david@...>
> November 14, 2011 7:56 AM
> Hi Scott.
>
> Good to hear from you.  Look forward to your new modules!  Will they 
> also be through Paul / MOTM?
>
>  David
>
> The Old Crow <mailto:oldcrow@...>
> November 13, 2011 7:50 PM
> Hey folks,
>
> Yes I have been very busy, but I am still here. Overhauling a CS-80
> for someone right now, in fact.
> I have tested my IG00153 board, it works fine. I am trying to get
> several chip-level and modular synthesizer products ready to ship by
> Jan. 1, including the 151, 153 and two 5U modules (GX1 bandpass and 
> VCO153).
>
> Scott Rider
> /**/
>
>
>
> ------------------------------------
>
> Yahoo! Groups Links
>
>
>
> organissimo <mailto:b3groover@...>
> November 13, 2011 12:19 PM
> Hello folks!
>
> I'm new to the group. I just purchased a Yamaha CS50 that only has one 
> voice card fully functioning. Thankfully I got the synth very cheap. 
> I've traced the issues down to two EGs and a couple VCAs. But as 
> everyone knows, those proprietary Yamaha chips are becoming more and 
> more scarce. This is a problem that will only be exacerbated as time 
> marches on.
>
> I've found some old posts on this group from Scott Rider (Old Crow) 
> concerning re-creating some of these chips. I've emailed Scott but 
> have yet to hear back. It seems he hasn't posted in a few years as 
> well. I hope he is ok.
>
> Has anyone else looked into re-creating these chips? I'm not an 
> electronics engineer by any stretch of the imagination. But it seems 
> like it would be possible, using modern components like the THAT 2181 
> VCA, to create a viable substitute for chips like the IG00151 VCA.
>
> Thoughts?
> ----Jim
>
>
>
> ------------------------------------
>
> Yahoo! Groups Links
>
>
>


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