[sdiy] Envelope attack smoothing for drum question

[Didier Leplae]

That’s interesting to know, however I doubt that is the issue we are having. The clicking does not always occur. With the oscilloscope we can see that it seems to occur only when there is a big step up on the attack. 

> On Aug 21, 2020, at 2:25 PM, 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
> 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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