AW: Envelope follower schamtic
Juergen.Haible at nbgm.siemens.de
Tue Jun 24 12:03:43 CEST 1997
>this is ingenious....i cant read german either, but it looks
like the first
>section acts as an unfiltered full wave rectifier so that the
>are doubled, which makes the filtering more effectiv in the
>section......i wouldn't have thought of that on a million
I can read German, but I only got the first half of the text (Reload
Using two rectifiers is an old trick - I have seen a circuit in
which uses even more than two rectifiers in series. The good thing of
this specific circuit is its minimum part count !
The NE57x devices are single supply chips, so you need the offset
voltage at the final opamp stage, as shown in the circuit. I wonder how
stable the offset voltage is (temperature dependency ?) If you want to
use envelope followers on signals with large dynamics, zero offset is
And using only one capacitor for smoothing might not be the best choice.
Maybe the final opamp should be configured as an dditional 2-pole LP
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Size: 1955 bytes
Desc: not available
More information about the Synth-diy