It should read "I could NOT detect any difference ...". Sorry.
Dieter

> -----Ursprüngliche Nachricht-----
> Von: Doepfer_a100@yahoogroups.com [mailto: Doepfer_a100@yahoogroups.com ]
> Gesendet: Dienstag, 7. November 2017 16:26
> An: Doepfer_a100@yahoogroups.com
> Betreff: AW: 1 Envelope Generator Problem
>
>
> Hello,
>
> I took an A-140 and cannot confirm this behaviour. That's what I did:
>
> - wait about 10 seconds
> - permanent high signal to the gate input
> - measuring the ADSR output (especially the peak voltage) with
> oscilloscope -> peak is about +8.4V
> - replacing the permanent gate signal by an LFO rectangle with about 10 Hz
> - measuring the ADSR output (especially the peak voltages) with
> oscilloscope -> all peaks are about +8.4V
>
> I could detect any difference in the peak level of the "first" envelope
> (permanent gate) and the peak levels when the A-140 was triggered by the
> LFO.
>
> Best wishes
> Dieter Doepfer
>
>
>
> > -----Ursprüngliche Nachricht-----
> > Von: Doepfer_a100@yahoogroups.com [mailto: Doepfer_a100@yahoogroups.com ]
> > Gesendet: Dienstag, 7. November 2017 04:11
> > An: Doepfer_a100@yahoogroups.com
> > Betreff: 1 Envelope Generator Problem
> >
> >
> >
> >
> >
> > Hi Folks
> >
> > Sorry to post this again but my whole modular synth is unusable
> > until I fix this problem so I still need help.
> >
> > The problem: All of my envelope generators do the same thing -
> > When I play a note they peak at a certain voltage, lets say 5
> > volts. But when I play a second note that peak rises to 6 volts.
> > And in some cases when I play 16th notes it rises even more.
> >
> > So when I connect the output of an envelope generator to a VCA
> > the first note I play is always MUCH quieter than every following note.
> >
> > I have 3 Doepfer LC9 cases with various modules in each. This
> > behavior is consistent in all three boxes with all of my envelope
> > generators.
> >
> > The modules are:
> > Doepfer A-140 (3 of these)
> > Doepfer A-143-2 quad
> > Roland 540
> >
> > Also, the all 4 of the envelopes in the A-143-2 do not actually
> > sustain. The voltage constantly falls when a note is held, even
> > when the sustain level is set to maximum. That is a separate
> > problem but I thought I'd mention it.
> >
> > Also, for some reason the release time of the Roland 540 is only
> > 2 seconds (even on the Slow setting) when plugged into any VCA,
> > however when it is plugged into the Roland filter the release
> > time is much longer. Another weird problem but I thought I'd
> > mention it in case it was an important clue.
> >
> > I have tested the output of all of the envelopes with both analog
> > and digital volt meters to confirm the behavior.
> >
> > At this point I'm not sure what to do to fix this. I guess the
> > first question is: Is this the way these envelopes are supposed
> > to work I have owned analog synthesizers since 1978 and own a
> > lot of them right now and not a single one has this behavior.
> > Other than when using velocity sensitivity, every note played is
> > exactly the same volume.
> >
> > Is this a known issue Are there combination of modules that can
> > cause this to happen Could it be the power supplies I have
> > moved the modules around and found the behavior is the same
> > regardless of how many modules (or which ones) are in a case.
> >
> > What kind of troubleshooting can I do With only a trigger
> > voltage being sent to the Envelope module I don't think there
> > could be anything else interfering but I'm looking for any clues
> > at all, even the most obvious ones that I may have overlooked.
> >
> > I did a video to show the problem: https://youtu.be/x8_1ZnmPWLo
> >
> > Thanks for any ideas anyone might have!
> >
> > Scott
> >
> >
> >
> >
> >
> >
>
>
>
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