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

[Harald]

Well,

scroll a little back in this thread to page 7/8 and have a look at my 
comparison. Harry Bissell' envelope follower is in no way better than 
the classical approach. It is slower, has more ripple and is about 500mV 
off.
Harald

Am 15.12.21 um 10:08 schrieb Tom Wiltshire:
> 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 <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
>> _______________________________________________
>> Synth-diy mailing list
>> Synth-diy at synth-diy.org <mailto:Synth-diy at synth-diy.org>
>> http://synth-diy.org/mailman/listinfo/synth-diy <http://synth-diy.org/mailman/listinfo/synth-diy>
>> Selling or trading? Use marketplace at synth-diy.org <mailto:marketplace at synth-diy.org>
> 
> 
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at synth-diy.org
> http://synth-diy.org/mailman/listinfo/synth-diy
> Selling or trading? Use marketplace at synth-diy.org
>