[sdiy] Best & fastest envelope follower schematic.. anybody ?

[Adam Inglis (synthDIY)]

> On 16 Dec 2021, at 07:44, Paul Perry via Synth-diy <synth-diy at synth-diy.org> wrote:
> 
> There are no perfect followers, but sometimes there are ones that are useful for a particular application.


Exactly, which begs the question, what purpose does JP have for this no-lag follower? Because musically, most followers are ‘good enough’…

A





> 
> paul perry melbourne australia
> 
> On Thu, 16 Dec 2021 at 02:35, Benjamin Tremblay via Synth-diy <synth-diy at synth-diy.org <mailto:synth-diy at synth-diy.org>> wrote:
> I lost all interest in envelope followers when I tried out some designs and observed the lag. 
> These are mostly “envelope smoothers” and most are barely any better than an old incandescent vactrol attenuator circuit used in FM broadcast.
> They mostly just drive non-musical effects under the category “something weird happens when I play my guitar”.  Pre-filtering the audio probably helps but there’s no guidance on best all-round EQ.
> Only The Residents got much mileage out of envelope followers over the years.
> 
> > On Dec 15, 2021, at 10:05 AM, Jean-Pierre Desrochers <jpdesroc at oricom.ca <mailto:jpdesroc at oricom.ca>> wrote:
> > 
> > Hi Tom,
> > 
> >> Harry Bissell's envelope follower is well thought of for its combination of speed and accuracy.
> >> https://modwiggler.com/forum/viewtopic.php?t=109067 <https://modwiggler.com/forum/viewtopic.php?t=109067>
> > 
> > This is a very clever project and neat design.
> > But still too much ‘lag’ on the falling edges incoming signal.
> > So far.. a PIC would do best with least components..
> > Hmmmm...
> > As usual.. Thank you for you good suggestion anyway !
> > JP
> > 
> > 
> > De : Tom Wiltshire <tom at electricdruid.net <mailto:tom at electricdruid.net>> 
> > Envoyé : 15 décembre 2021 04:08
> > À : Jean-Pierre Desrochers <jpdesroc at oricom.ca <mailto:jpdesroc at oricom.ca>>
> > Cc : Synth-diy at synth-diy.org <mailto:Synth-diy at synth-diy.org>
> > Objet : Re: [sdiy] Best & fastest envelope follower schematic.. anybody ?
> > 
> > Hi JP,
> > 
> > Harry Bissell's envelope follower is well thought of for its combination of speed and accuracy.
> > 
> > https://modwiggler.com/forum/viewtopic.php?t=109067 <https://modwiggler.com/forum/viewtopic.php?t=109067>
> > 
> > It's a good circuit, but pretty complicated, especially for an effect pedal design. So like you, I thought "PIC!", and had a go at implementing it in firmware.
> > 
> > The round-robin three peaks detectors are easy enough. Doing the output filtering is more demanding on a chip with no multiply, but I managed it by being choosy about the filter coefficients and keeping things binary friendly. The end result was pretty good and used a little PIC to the maximum extent.
> > 
> > HTH,
> > Tom
> > 
> > ==================
> >       Electric Druid
> > Synth & Stompbox DIY
> > ==================
> > 
> > 
> > 
> > 
> > On 15 Dec 2021, at 01:34, Jean-Pierre Desrochers <mailto:jpdesroc at oricom.ca <mailto:jpdesroc at oricom.ca>> wrote:
> > 
> > Hi all,
> > I’m looking for a fast and accurate voltage follower circuit.
> > There are plenty of them on the web to build but they all
> > suffer of inaccuracy and lag on the final DC output (final stage of low pass to smooth off the incoming peaks).
> > The incoming voltage will be a varying 0 to +/-5v peak.
> > I thought about implementing a solution using a small PIC with ADC/DAC
> > but even if these micros are very cheap this solution would be overkill.. would it be ?
> > So far the available circuits have too much lag on their DC output.
> > (The envelope takes too much time to get back to zero after a fast incoming peak)
> > Any known & reliable circuits ?
> > JP
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