[sdiy] Fast envelope follower circuit needed..

[Dave Manley]

Go cheap and old school: series diode into parallel RC (look up AM detector).  Buffer output as needed. Replace R with fet or vactrol.  It might have character you wont find in a precision circuit.

It should at least be ' fast' to build (and discard?).  ;-)

-------- Original Message --------
 From: Tim Parkhurst <tim.parkhurst at gmail.com>
 Sent: Thu, Mar 28, 2013 04:42 PM
 To: Jean-Pierre Desrochers <jpdesroc at oricom.ca>
 CC: Synth-DIY <synth-diy at dropmix.xs4all.nl>
 Subject: Re: [sdiy] Fast envelope follower circuit needed..

>I'm pretty sure a digital envelope follower won't sound as fat as an
>analog one. And if it's surface mount, forget it. It will never have
>that pleasing ninth-harmonic distortion that makes it 'sit it the mix'
>just right.
>
>On the other hand, if you're looking for inspiration from an
>interesting circuit design, you might try this one from our very own
>Harry Bissell
>http://www.edn.com/design/analog/4344656/Envelope-follower-combines-fast-response-low-ripple
>
>This one uses three peak detector circuits with slightly different
>time constants. Could be useful, even just as inspiration for a
>digital method.
>
>Tim (sits in the mix to add more bottom end) Servo
>---
>"Sire, the church of God is an anvil that has worn out many hammers."
>- H.L. Hastings
>
>
>On Thu, Mar 28, 2013 at 5:44 AM, Jean-Pierre Desrochers
><jpdesroc at oricom.ca> wrote:
>> Hi List,
>> I'm sure this has been already discussed in the past
>> but I'm looking for a fast envelope follower circuit
>> schematic to rectify an incoming +/-2.5v AC waveform
>> to a rectified 0-5v wave.. The wave frequency could
>> go as low as 1 hz and sometimes will not be symetrical.
>> Any circuits welcomed !
>> JP
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