[sdiy] Any noise avantage to parallel 2164 VCAs?

[Schwarz Raphael]

Wouldn’t this cause impedance issues all over the place ? Like the idea of physically stacking op-amps is a good intuition but yields bad results (never tried it myself but it seems to be a recurrent topic in guitar pedal DIY )

> Le 17 juin 2018 à 17:34, Ian Fritz <ijfritz at comcast.net> a écrit :
> 
> Circuitry? Can’t you just parallel them pin for pin?
> 
> Ian
> 
>> On Jun 17, 2018, at 6:05 AM, Schwarz Raphael <raphschwarz at gmail.com> wrote:
>> 
>> Hi Tom, 
>> Don’t know if the effort of using them in parallel is worth the circuitry , I reckon noise is already low enough in the 2164 for synth use, however you usually use a pair per vca to linearize the vca response (or a mixed response) as 2164 has a log response that is generally unwanted (log envelope into a linear vca produces a natural envelope , log envelope into a log vca will produce loud clicks) but maybe you are pairing this with a digital linear envelope ? That would make sense !
>> 
>> Cheers !
>> Raph
>> 
>> 
>>> Le 17 juin 2018 à 13:49, Tom Wiltshire <tom at electricdruid.net> a écrit :
>>> 
>>> Hi all,
>>> 
>>> A quick query, if I may: Is there any noise advantage to using two 2164 VCAs in parallel?
>>> 
>>> I’ve got a circuit that uses two VCAs, so there are two others spare on the chip. And then it occurred to me that there might be a minor gain by using them in parallel pairs. It’s a case of “well, they’re there so we might as well use them” if there’s no reason not to.
>>> Or would it be better to simply disable the unused sections?
>>> 
>>> Thanks,
>>> Tom
>>> 
>>> ==================
>>>     Electric Druid
>>> Synth & Stompbox DIY
>>> ==================
>>> 
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