<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class=""><br class=""><div><br class=""><blockquote type="cite" class=""><div class="">On 16 Dec 2021, at 07:44, Paul Perry via Synth-diy <<a href="mailto:synth-diy@synth-diy.org" class="">synth-diy@synth-diy.org</a>> wrote:</div><div class=""><div dir="ltr" class=""><br class=""><div class="">There are no perfect followers, but sometimes there are ones that are useful for a particular application.</div></div></div></blockquote><div><br class=""></div><div><br class=""></div><div>Exactly, which begs the question, what purpose does JP have for this no-lag follower? Because musically, most followers are ‘good enough’…</div><div><br class=""></div><div>A</div><div><br class=""></div><div><br class=""></div><div><br class=""></div><div><br class=""></div><br class=""><blockquote type="cite" class=""><div class=""><div dir="ltr" class=""><div class=""><br class=""></div><div class="">paul perry melbourne australia</div></div><br class=""><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, 16 Dec 2021 at 02:35, Benjamin Tremblay via Synth-diy <<a href="mailto:synth-diy@synth-diy.org" class="">synth-diy@synth-diy.org</a>> wrote:<br class=""></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">I lost all interest in envelope followers when I tried out some designs and observed the lag. <br class="">
These are mostly “envelope smoothers” and most are barely any better than an old incandescent vactrol attenuator circuit used in FM broadcast.<br class="">
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.<br class="">
Only The Residents got much mileage out of envelope followers over the years.<br class="">
<br class="">
> On Dec 15, 2021, at 10:05 AM, Jean-Pierre Desrochers <<a href="mailto:jpdesroc@oricom.ca" target="_blank" class="">jpdesroc@oricom.ca</a>> wrote:<br class="">
> <br class="">
> Hi Tom,<br class="">
> <br class="">
>> Harry Bissell's envelope follower is well thought of for its combination of speed and accuracy.<br class="">
>> <a href="https://modwiggler.com/forum/viewtopic.php?t=109067" rel="noreferrer" target="_blank" class="">https://modwiggler.com/forum/viewtopic.php?t=109067</a><br class="">
> <br class="">
> This is a very clever project and neat design.<br class="">
> But still too much ‘lag’ on the falling edges incoming signal.<br class="">
> So far.. a PIC would do best with least components..<br class="">
> Hmmmm...<br class="">
> As usual.. Thank you for you good suggestion anyway !<br class="">
> JP<br class="">
> <br class="">
> <br class="">
> De : Tom Wiltshire <<a href="mailto:tom@electricdruid.net" target="_blank" class="">tom@electricdruid.net</a>> <br class="">
> Envoyé : 15 décembre 2021 04:08<br class="">
> À : Jean-Pierre Desrochers <<a href="mailto:jpdesroc@oricom.ca" target="_blank" class="">jpdesroc@oricom.ca</a>><br class="">
> Cc : <a href="mailto:Synth-diy@synth-diy.org" target="_blank" class="">Synth-diy@synth-diy.org</a><br class="">
> Objet : Re: [sdiy] Best & fastest envelope follower schematic.. anybody ?<br class="">
> <br class="">
> Hi JP,<br class="">
> <br class="">
> Harry Bissell's envelope follower is well thought of for its combination of speed and accuracy.<br class="">
> <br class="">
> <a href="https://modwiggler.com/forum/viewtopic.php?t=109067" rel="noreferrer" target="_blank" class="">https://modwiggler.com/forum/viewtopic.php?t=109067</a><br class="">
> <br class="">
> 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.<br class="">
> <br class="">
> 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.<br class="">
> <br class="">
> HTH,<br class="">
> Tom<br class="">
> <br class="">
> ==================<br class="">
> Electric Druid<br class="">
> Synth & Stompbox DIY<br class="">
> ==================<br class="">
> <br class="">
> <br class="">
> <br class="">
> <br class="">
> On 15 Dec 2021, at 01:34, Jean-Pierre Desrochers <mailto:<a href="mailto:jpdesroc@oricom.ca" target="_blank" class="">jpdesroc@oricom.ca</a>> wrote:<br class="">
> <br class="">
> Hi all,<br class="">
> I’m looking for a fast and accurate voltage follower circuit.<br class="">
> There are plenty of them on the web to build but they all<br class="">
> suffer of inaccuracy and lag on the final DC output (final stage of low pass to smooth off the incoming peaks).<br class="">
> The incoming voltage will be a varying 0 to +/-5v peak.<br class="">
> I thought about implementing a solution using a small PIC with ADC/DAC<br class="">
> but even if these micros are very cheap this solution would be overkill.. would it be ?<br class="">
> So far the available circuits have too much lag on their DC output.<br class="">
> (The envelope takes too much time to get back to zero after a fast incoming peak)<br class="">
> Any known & reliable circuits ?<br class="">
> JP<br class="">
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