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<div>Douglas Self wrote something about using opamps in parallel for noise reduction, in his small signal audio book. Don't remembner details, and no idea how much it's applicable to that VCA chip. A former colleage of mine mentioned it, he tried it and it did what it was supposed to. I think the outputs were not "tied together", one of them had a small resistor. Not sure though.</div>
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<div style="margin:0 0 10px 0;"><b>Von:</b> "David G Dixon" <dixon@mail.ubc.ca><br/>
<b>Betreff:</b> Re: [sdiy] Any noise avantage to parallel 2164 VCAs?</div>
<div name="quoted-content">I wouldn't bother. I did tie two 2164s together in parallel in a very early<br/>
iteration of the Quadra design, and I seem to remember the outputs<br/>
interacting in strange ways. I may have done something else wrong.<br/>
<br/>
> -----Original Message-----<br/>
> From: Synth-diy [mailto:synth-diy-bounces@synth-diy.org] On<br/>
> Behalf Of Tom Wiltshire<br/>
> Sent: Sunday, June 17, 2018 4:49 AM<br/>
> To: Synth-diy@synth-diy.org DIY<br/>
> Subject: [sdiy] Any noise avantage to parallel 2164 VCAs?<br/>
><br/>
> Hi all,<br/>
><br/>
> A quick query, if I may: Is there any noise advantage to<br/>
> using two 2164 VCAs in parallel?<br/>
><br/>
> I've got a circuit that uses two VCAs, so there are two<br/>
> others spare on the chip. And then it occurred to me that<br/>
> there might be a minor gain by using them in parallel pairs.<br/>
> It's a case of "well, they're there so we might as well use<br/>
> them" if there's no reason not to.<br/>
> Or would it be better to simply disable the unused sections?<br/>
><br/>
> Thanks,<br/>
> Tom<br/>
><br/>
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