[sdiy] AHDSR schemo

[Roman]

If the ADSR is with attack level adjutment (I make those kinds only)
there's no need for amplifying whole envelope and sustain stays the same.
But delaying trip time is also good. If attack is exponential like resistor
charging capacitor, that'll cause bigger attack peak when trip is delayed.
If it's linear like cap charged from current source, one must make sure
the source's maximum voltage is at peak level, so it' doesn't raise any
firther if trip is delayed.

Roman

----- Original Message -----
From: "Scott Gravenhorst" <music.maker at gte.net>
To: <synth-diy at dropmix.xs4all.nl>
Sent: Thursday, March 18, 2004 10:43 PM
Subject: Re: [sdiy] AHDSR schemo


> [my opinion mode]
> Though both methods will work, I believe that a one-shot would be the
better
> way.  The reason is that to use clipping, the ADSR signal has to be
variably
> amplified.  In doing so, the sustain part of the signal, which is also a
> controllable level, will also be amplified.  Because of this, the clipping
> amplification setting will interact with the sustain level.  With the one
> shot method, no such interaction will occur, regardless of the time dialed
up
> for punch.  Jim's method, which I also presented, can do this with only
> passive components, a cap, a pot and a diode and can also be applied to
> designs I've seen that use a threshhold detector and RS flipflop.
> [end]
>
> "Roman" <modular at go2.pl> wrote:
> >just a thought
> >take any ADSR, the best would be the kind with adjustable peak level,
> >and clip it. Without punch it'd work at normal level and look like ADSR.
> >When punch is activated, peak level wil increase, but output buffer would
> >be clipped at constant level, giving flat top for some time and AHDSR.
> >
> >Roman
> >
> >----- Original Message -----
> >From: "The Old Crow" <oldcrow at oldcrows.net>
> >To: <synth-diy at dropmix.xs4all.nl>
> >Sent: Thursday, March 18, 2004 7:13 PM
> >Subject: Re: [sdiy] AHDSR schemo
> >
> >
> >>
> >>   Seems to me the simplest way to add punch delay is with a small
one-shot
> >> (series pot, cap to ground, diode clamp to ground to snub the
> >> negative-going impulse and perhaps a buffer/inverter gate) in the logic
> >> line that changes state when the attack cycle reaches the point it
> >> transistions in the decay.
> >>
> >> Crow
> >> /**/
> >>
> >
>
> =========================================================
> - Where merit is not rewarded, excellence fades.
> - Hydrogen is pointless without solar.
> - What good are laws that only lawyers understand?
> - The media's credibility should always be questioned.
> - The only good terrorist is a dead terrorist.
> - Governments do nothing well, save collect taxes.
>
> -- Scott Gravenhorst | LegoManiac / Lego Trains / RIS 1.5
> -- Linux Rex         | RedWebMail by RedStarWare
> -- FatMan: home1.gte.net/res0658s/FatMan/
> -- NonFatMan: home1.gte.net/res0658s/electronics/
> -- Autodidactic Master of Arcane and Hidden Knowledge.
>