Odp: [sdiy] ADSR Question

[Roman Sowa]

If there was standard, there wouldn't be reason for DIY.
Make it however you like it. My ADSR has switchable
threshold. They're at about 40% and 90% of exponential
curve AFAIR. Both have their musical use.
If your circuit allows it, make it swichable.

Roman

----- Original Message ----- 
From: Scott Gravenhorst <music.maker at gte.net>
To: <synth-diy at dropmix.xs4all.nl>
Sent: Saturday, June 07, 2003 11:11 PM
Subject: [sdiy] ADSR Question


> I have played with several designs for ADSRs.  My question
> regards the attack curve.  In my lastest design, I used a
> 4069UB to make all of the logic.  Because I use a gate as a
> threshhold detector, the attack portion ends when the
> integration cap reaches 1/2 Vdd.  This gives a fairly
> straight line for the attack curve.  I tried playing divider
> games to get it detect at a higher voltage, but the circuit
> became erratic when I pushed this too far.  I believe I was
> able to get it to work reliably up to about 2/3 Vdd where it
> looks pretty nice and rounded.
> 
> Is there a standard threshhold that is used in most ADSRs? 
> If so, what is it?
> 
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