[sdiy] Curious problem with VCA click

John Staapel j.staapel at gmail.com
Tue Jun 1 19:59:18 CEST 2021


The AS3360 has a bad attenuation.  About -70 db.  You will hear probably a
leakage when the VCA is off

Op di 1 jun. 2021 om 19:44 schreef Benjamin Tremblay via Synth-diy <
synth-diy at synth-diy.org>:

> Hah. Case closed.
> Capacitors from filter to VCA get rid of the click and let me use a sharp
> attack.
>
> And really I can’t say enough good things about the AS3360 dual VCA. Super
> quiet and so cost-effective.
>
> If I power up my project only via 5V over the USB line (to update
> firmware), enough power gets into the analog circuits so they all basically
> work. It amazes me the 3360s still work on monopolar five volts.
>
> On Jun 1, 2021, at 12:17 PM, Benjamin Tremblay <btremblay at me.com> wrote:
>
> I guess my question is, what makes the high pass signal different from the
> low pass signal to account for this? I could try bypassing the 2164 mixer
> stages.
>
> Benjamin Tremblay
>
> On Jun 1, 2021, at 12:12 PM, Florian Anwander <fanwander at mnet-online.de>
> wrote:
>
> 
>
> Hello,
>
>
> Am 01.06.21 um 16:57 schrieb Benjamin Tremblay via Synth-diy:
>
> VCA produces a loud click (with with a slow-ish envelope attack)
>
> Sounds a littlebit like the gate would appear as a (small) DC-jump in the
> envelope-out signal. Did you check the envelope?
>
>
> Florian
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