[sdiy] favorite adsr?

[David G. Dixon]

By the way, since we're talking about ADSRs...

I've recently altered Ray Wilson's ADSR to accommodate negative envelope
output and a trigger repeat mode option.  This involves the addition of a
single TL072, half a dozen resistors, a diode and a switch.  If anybody's
interested, I'll happily send along my schematic and my layout (single or
dual).

> -----Original Message-----
> From: synth-diy-bounces at dropmix.xs4all.nl [mailto:synth-diy-
> bounces at dropmix.xs4all.nl] On Behalf Of Dan Snazelle
> Sent: Sunday, May 31, 2009 7:00 AM
> To: nicolas3141 at yahoo.com.au; sdiy
> Subject: RE: [sdiy] favorite adsr?
> 
> 
> thanks a lot for this simple circuit
> 
> i will check it out today!!
> 
> 
> 
> 
> >
> >
> > 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  wrote:
> >
> >> From: David G. Dixon
> >> Subject: RE: [sdiy] favorite adsr?
> >> To: "'Dan Snazelle'" , "'sdiy'"
> >> 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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> >>
> >
> >
> >
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