[sdiy] AHDSR schemo

[Scott Gravenhorst]

Hi Roman,

I've not yet seen this design, can you point to an example?

"Roman" <modular at go2.pl> wrote:
>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.
>>
>

=========================================================  
- 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.