Yamaha CS80

You do not really need the 159/151 to make an attack-release EG just 
for a modulator.  Google for a "attack release envelope generator 
schematic."  The IG00150 is another part I plan to make as a small 
retrofit board.  --Crow

On 11/18/2011 3:35 PM, elie wrote:
> Thanks for the insight, I'll have to come up with a suitable substitute - turns out the VCO part is not available - the part I had my eye on has +/- a zero vs. the proper part...
>
> http://www.organforum.com/forums/showthread.php?18878-latest-OrganGrinder-list
>
> I'll get there eventually!
>
> Elie
>
> --- In yamahacs80@yahoogroups.com, The Old Crow<oldcrow@...>  wrote:
>>     The 159 is a linear timing/voltage sequence generator that uses the
>> exponential input of the 151 to create the exponential sloped envelopes.
>>
>> Crow
>> /**/
>>
>> On 11/15/2011 9:16 PM, elie wrote:
>>> Hi, I'm implementing a CS-80 Ring Modulator design on another Yamaha Synth.  No problem getting the Modulator&   buffer amps, VCO chip but the VCA (IG00151)and Envelope Generator (IG00159) are not practical to purchase.
>>>
>>> My question is if the VCA and Envelope Generator are Linear or Exponential in function?...not sure if the service manual might answer that so just in case anyone knows?
>>>
>>> Thanks!
>>> Elie
>>>
>>>
>
>
>
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