[sdiy] Sliders and envelopes

[Sean Ellis]

Tom has a very low parts count VCADSR using a PIC. It's probably the most 
fully featured ADSR I've seen :-)
http://www.electricdruid.net/index.php?page=projects.envgen7

----- Original Message ----- 
From: "Tim Ressel" <madhun2001 at yahoo.com>
To: "synthdiy DIY" <synth-diy at dropmix.xs4all.nl>
Sent: Sunday, January 04, 2009 10:38 AM
Subject: Re: [sdiy] Sliders and envelopes


> Ouch, Paul. MAX541s are $25. Check out AD5061 at $6.78. Or is that a typo? 
> MAX541 is a 16-bit DAC.
>
> Also there is the trick of using a PWM output through a filter to produce 
> a DAC-like output. Should be good enough for an EG output.
>
> --TimR
>
>
>
> --- On Sun, 1/4/09, Paul Maddox <paul.maddox.mail-list at synth.net> wrote:
>
>> From: Paul Maddox <paul.maddox.mail-list at synth.net>
>> Subject: Re: [sdiy] Sliders and envelopes
>> To: "synthdiy DIY" <synth-diy at dropmix.xs4all.nl>
>> Date: Sunday, January 4, 2009, 1:02 AM
>> Maarten,
>>
>>   or could could do it with an AVR Mega8, 8 sliders and two
>> MAX541s.
>> This would give you TWO ADSRs with 12 bit resolution and
>> the ability to choose slope shapes (linear, expo, rev expo,
>> etc), very few parts required for that.
>>
>> Paul
>>
>> On 3 Jan 2009, at 21:50, Maarten Halmans wrote:
>>
>> > I would like to build an envelope generator with Alps
>> sliders, I can only get these sliders in 10k log or 50k lin.
>> Is it possible to get normal times (something between 1
>> millisecond and  10 seconds) for the attack, decay and
>> release stages without using a large timing capacitor? Of
>> course I could go for a voltage controlled envelope
>> generator, but than a lot more components are involved and I
>> am not specifically looking for voltage control of these
>> parameters.
>> > Any ideas?
>> > Thanks,
>> > Maarten
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