[sdiy] Envelope attack smoothing for drum question

[Jacob Watters]

You mentioned an OTA based VCA. I have experienced some clicking with these
in the past. Use a linearizing diode and calibrate the 1k trimpot (
https://i.stack.imgur.com/5drhW.jpg). That will rule out the VCA as the
source of the click.

*Jacob Watters*
JacobWatters.com <http://jacobwatters.com/>
Tel: 226-886-3526


On Wed, Aug 19, 2020 at 5:42 PM Didier Leplae via Synth-diy <
synth-diy at synth-diy.org> wrote:

> We are working on an analog drum module that uses a simple envelope
> created from a trigger to control the amplitude of a triangle oscillator
> with a basic OTA based VCA.
>
> We are having a problem with a slight clicking sound at the beginning of
> many of the drum hits. We think this is because the attack of our envelope
> is so sharp that the beginning of our drum hit looks like a straight jump
> from 0V to wherever the triangle wave happens to fall. Therefore the click
> is somewhat random in that it doesn't occur when the triangle happens to be
> low at the time of attack.
>
> Can anyone suggest a simple way to deal with this, like adding a slight
> bit of attack time to the envelope? How could this be done without adding
> too many parts?
>
> Thanks,
>
> Didier
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