[sdiy] favorite adsr?

[Tom Wiltshire]

I'd be extremely sceptically about any claims made purely on the  
basis of one technology or another.
You can use CMOS switches or transistors of one sort or another in an  
analogue ADSR, and I doubt you could generalise. Some will be faster,  
some slower. Usually there is a trade-off between being able to reach  
long segment times and being able to produce an extremely short  
segment time. This is down to the charging capacitor required. A big  
cap can give you very long times, but even with minimum resistance  
will still take a few mSecs to charge.

Myself, I gave up on analogue ADSRs some time ago. They use a lot of  
components and are relatively complicated compared to a digital  
solution, on top of which digital is more flexible (any curve shape  
you like, for instance). There was a time back in the early days when  
digital envelopes were pretty basic, used sample rates of 100Hz, and  
got a reputation for being sluggish and not sounding good, but that  
was years ago. It's easy to design a far better envelope than appears  
in the Waldorf Wave, say.

Finally, it is worth saying that any time under 1mS or so is just a  
"click" sound anyway, so you might not find it that appealing.

Regards,
Tom


On 29 May 2009, at 12:02, Dan Snazelle wrote:

>
>
>
> i am going to be testing out ADSR'S all weekend and i have heard  
> (maybe wrongly) that transistor based ADSR's are quicker/snappier.
>
> is this true? any recommendations on circuits to try?
>
> thanks
>
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