[sdiy] Envelope attack smoothing for drum question

Dakota Melin dksynth at gmail.com
Fri Aug 21 21:51:20 CEST 2020


I think Jacob might be pointing out that if your VCA itself has DC offset
problems that’ll thump as well.

On Fri, Aug 21, 2020 at 3:41 PM Tom Wiltshire <tom at electricdruid.net> wrote:

> How does use of the linearising diodes hep with the offset click?
>
> I agree about eliminating the offset as a source of the click, since if
> the VCA thumps, it doesn’t;t matter what signal you feed it, or even if you
> feed it no signal at all, you’ll still hear a click, but I don’t see what
> the linearising diodes have to do with that.
>
> Tom
>
>
>
>
> On 21 Aug 2020, at 20:25, Jacob Watters <jacobwatters at gmail.com> wrote:
>
> 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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