Yamaha CS80

Yup this is terrific news! Well done scott :) 

> WE STAND AT SALUTE!!!! 
> 
> this is awesome. a drop-in complete m-board pcb, with BOM, would be so huge......wow. 
> 
>  
> 
> --- On Wed, 3/18/09, The Old Crow <oldcrow@...> wrote: 
> 
> From: The Old Crow <oldcrow@...>
> Subject: [yamahacs80] VCO153 project in board test phase
> To: yamahacs80@yahoogroups.com
> Date: Wednesday, March 18, 2009, 1:39 AM 
> 
>  
> 
>  
> 
>  
> 
>  
> 
>  
> 
>     
>               Hey folks, its been a while, but I have this thing in testing right  
> 
> now.  This is an equivalent circuit to the IG00153.  This differs from  
> 
> my MOTM-style modular 153 oscillator in that it is strictly the VCO IC  
> 
> with a ramp output, linear CV input, current bias input (FT) for octave  
> 
> select and exponential modulation (vibrato) input.  It can use the  
> 
> original M-board FET and charge pump capacitor, or those can be removed  
> 
> and local ones installed.  I made this mainly to see about replacing  
> 
> things at the chip level, but not relying on custom devices.  It is 98%  
> 
> SMT parts, with only 3 parts left through-hole for the moment (mainly to  
> 
> swap things and see how the specs change).  It no longer needs an input  
> 
> offset trimmer, or external frequency compensation of the input summing  
> 
> amp.  The DIL-16 footprint in the middle of the board is used to install  
> 
> it into an actual IG00153 socket. Generally it is low-profile enough to  
> 
> fit between M boards (it does in my CS-50).  It has internal temperature  
> 
> compensation of the charge switch and comparator, making it much more  
> 
> stable than the original device.  The charge pump core circuit runs on  
> 
> its own internal 10V reference supply. 
> 
>  
> 
> Eventually I want to craft the entire M-board from standard circuits.   
> 
> The waveshaper is done (it is the one I made for the 153 module).  The  
> 
> EGs are done.  The filters are done.  I know how to build the VCA, thats  
> 
> next.  In any case here is an image of the board, a bit larger than  
> 
> actual size.  More later... 
> 
>  
> 
> http://www.cs80. com/VCO153_ pic.gif 
> 
>  
> 
> Crow 
> 
> /**/ 
> 
>  
> 
> 
>   
> 
>        
> 
>     
>     
> 	
> 	 
> 	
> 	 
> 
>  
> 
>  
> 
>  
> 
> 
> 	 
> 
> 
> 	
> 	 
> 
> 
>        
> 
> [Non-text portions of this message have been removed] 
>