[sdiy] favorite adsr?

[nicolas3141 at yahoo.com.au]

If simplicity is desirable you might want to check out my adsr.  See half way down this thread:
http://electro-music.com/forum/viewtopic.php?t=31473  
Simple enough to understand and adapt to your own needs, all with one quad op-amp and it can function like an LFO as well.  I make no claim that it is the best adsr, but it does have about the lowest chip count and can be built in an hour or two using bits you already have in your junk box (I don't think it is too critical which op-amp type you use).

Cheers,
Nicolas


--- On Sat, 30/5/09, David G. Dixon <dixon at interchange.ubc.ca> wrote:

> From: David G. Dixon <dixon at interchange.ubc.ca>
> Subject: RE: [sdiy] favorite adsr?
> To: "'Dan Snazelle'" <subjectivity at hotmail.com>, "'sdiy'" <synth-diy at dropmix.xs4all.nl>
> Received: Saturday, 30 May, 2009, 4:02 AM
> Dan,
> 
> I just finished laying out a dual version of Ray Wilson's
> ADSR.  It's a very
> simple circuit which uses a quad NOR gate (4001), 1/2 of a
> hex schmitt
> trigger (40106), 3/4 of a quad binary switch (4066), plus a
> few opamps
> (TL07x).  The whole circuit can be built for about $5
> or less, and I managed
> to fit two of them on a PCB 4" x 5.8" with 0.1" connectors
> to the panel.
> 
> I'll let you know what I think of it once it's built but
> simulations suggest
> it should be plenty fast on the short time setting (1uF
> tantalum cap).  It
> also has a long time setting (15uF tantalum cap, but I'm
> using 22 uF because
> that's all my local shop had).  Check it out at
> www.musicfromouterspace.com 
> 
> I'll send you my own (more linear and easy to follow)
> schematic and dual
> circuit layout if you're interested.
> 
> > > 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?
> 
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