Yamaha CS80

-----Original message-----
From: The Old Crow oldcrow@...
Date: Tue, 17 Mar 2009 22:39:13 -0600
To: yamahacs80@yahoogroups.com
Subject: [yamahacs80] VCO153 project in board test phase

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 madethis 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 buildthe 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]

----- Original Message ----- 
From: "The Old Crow" <oldcrow@...>
To: <yamahacs80@yahoogroups.com>
Sent: Wednesday, March 18, 2009 6:39 AM
Subject: [yamahacs80] VCO153 project in board test phase


  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
/**/



------------------------------------

Yahoo! Groups Links

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]

> 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] 
>

>
>   Hey folks, its been a while, but I have this thing in testing right 
> now.

>
> 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 <http://www.cs80.com/VCO153_pic.gif>
>
> Crow
> /**/
>
>

-----Original message-----
From: The Old Crowoldcrow@...
Date: Tue, 17 Mar 2009 22:39:13 -0600
To: yamahacs80@yahoogroups.com
Subject: [yamahacs80] VCO153 project in board test phase

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 inputsumming

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]