[sdiy] How does the JX3P VCA work?

[Mattias Rickardsson]

Maybe not necessary, but perhaps they could omit one trimpot per
voice, if the same color marking was used throughout?

Anyway, if you're Roland and you already have thousands of measured
trannies in bins, you could as well grab a full hand from the same bin
when making a machine. It's even easier than mixing them. :-)

/mr


On 15 January 2014 14:41, Florian Anwander <fanwander at mnet-online.de> wrote:
> Am 15.01.2014 14:09, schrieb Neil Johnson:
>
>>>> it doesn't make sense to have all 6 VCAs made from the same match
>>>> pattern
>>>
>>> Unless you want all 6 voices to behave the same. ;-)
>>
>> From these images it looks like all the transistors for a given
>> function have the same colour spot:
>
> I don't doubt, that Roland did handle it that way. My thought is more: was
> it really necessary? These are quasi linear VCAs. Different characteristics
> would have a lower impact than in an exponentiator. I don't doubt that there
> would exist a difference, but I doubt one would hear(!) the difference, if
> matched pairs with different HFEs would be used.
>
>
> Florian
>
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