> We also think about reducing the max. amplification
> e.g. to 2.5 or 3 as
> typical A-100 CVs are in the ~8Vss range (e.g. LFO,
> ADSR)

I think it should work identically to an A132 when used with an audio
signal and an ADSR.

> Beyond this point clipping occurs
> (but maybe this is
> desired).

I don't think you need to duplicate the Distortion/Waveshaper.

> Red LEDs are
> standard,
> blue/white/green/yellow/black :-) LEDs are possible

Do the black :-) LEDs consume less power

> > From the group's messages there seems to be some
> confusion. It is a
> difference if you want to measure the level of an
> audio signal or a DC/slow
> AC voltage. Slow AC is e.g. a LFO or ADSR with slow
> time settings.

I thought the group was nearly unanimous in wanting BOTH DC/Slow AC
and audio in the same meter. Timothy even suggested having both a
moving-coil meter and segmented LEDs in the same module, so that both
could be displayed simultaneously. (This would require separate audio
and DC input jacks.)

Personally, I'd be happy with a single moving-coil meter with two
scales: one for -10V to +10V, and the other with the usual dB scale
for audio Volume Units, and a switch for selecting AC or DC. Even
then, the separate input jacks would be useful.

> - average or peak or both (only with LED possible)

Some knowledgeable about audio engineering needs to chime in on this
one. What do the VU meters on standard mixing desks usually display

Joe

--- In Doepfer_a100@yahoogroups.com , Bakis Sirros
<synth_freak_2000@y...> wrote:

>
> --- Dieter Doepfer <hardware@d...> wrote:
> > From: "Dieter Doepfer" <hardware@d...>
> > To: "Bakis Sirros" <synth_freak_2000@y...>
> > Subject: my comments
> > Date: Tue, 27 May 2003 15:45:34 +0200
> >
> > Dear Bakis,
> >
> > please forward these comments to the group:
> >
> >
> > > Whoooezzzch... brakes on I take that back. The
> > A133 looks like a very good
> > > attenuator to me. Could be better but it will do
> > the job for me... the
> > only
> > > thing I don't get is that the LEDs are supposed to
> > show if it boosts or
> > > lowers the signal. I would prefer the LED to show
> > if the actual output is
> > > positive or negative, anybody else too I mean it
> > the dial is turned to
> > > positive I know it adds to the signal, right
> >
> > This would be possible. But from our first
> > experiments it seems to be better
> > to see what the module is doing. E.g. if you have a
> > 5Hz LFO signal from our
> > point of view it is better to know what the module
> > is doing than to see the
> > output voltage. But it would be no problem to
> > display the output voltage
> > (this would even simplify the circuit as it is much
> > easier to display the
> > output than the function).
> > We also think about reducing the max. amplification
> > e.g. to 2.5 or 3 as
> > typical A-100 CVs are in the ~8Vss range (e.g. LFO,
> > ADSR) and an
> > amplification more than 3 will not be possible
> > because of the +/-12V power
> > supply. The max. output voltage swing with +/-12V
> > power supply is
> > about -10...+10V. Beyond this point clipping occurs
> > (but maybe this is
> > desired).
> >
> >
> > > Blue LEDs standard You'll have to replace all of
> > your current
> > > modules with blue LED versions. How insidious :=)
> >
> > No. Everything remains unchanged. Red LEDs are
> > standard,
> > blue/white/green/yellow/black :-) LEDs are possible
> > (special order, see info
> > on our web site)
> >
> > > Sorry, but when can I order a Doepfer VU module
> >
> > We think about a VU module too and of course such a
> > module is not a problem.
> > But there are (once again) a lot of considerations
> > before we start such a
> > module, e.g.
> > - LED or meter display
> > - average or peak or both (only with LED possible)
> > - only positive or positive+negative display for
> > plus/minus DC or slow AC
> > measurements (VUs are normally only positive and
> > cannot be used to measure
> > DC or slowly changing AC voltages)
> >
> > From the group's messages there seems to be some
> > confusion. It is a
> > difference if you want to measure the level of an
> > audio signal or a DC/slow
> > AC voltage. Slow AC is e.g. a LFO or ADSR with slow
> > time settings.
> >
> > > theleds do show if the signal is positive or
> > > negative.that's why they are marked + and -...
> >
> > No! They show the current amplification
> > (-5...0...+5). They do not display
> > the output signal (but this would be possible too,
> > see remark above).
> >
> > > One minor point (not too critical, but correcting
> > it could prevent any
> > confusion later, if you
> > > are listening Dieter...) is that the little
> > 'distribution' graphics
> > > on the faceplate mock-up for the quantized random
> > voltages are round
> > > the wrong way: the '2^n' voltages a distributed
> > evenly, and so should
> > > have the 'flat' graphic next to them, and the
> > 'n+1' voltages have a
> > > triangular distribution, and so should have the
> > triangular graphic!
> >
> > Thank you for this note. You are right. Of course
> > the n+1 states have no
> > equal distribution as the medium voltage states
> > occur more often than the
> > higher and lower states (different high/low
> > combinations of the shift
> > register outputs will lead to the same analog
> > voltage because of the
> > identical resistor values). We will correct the
> > picture.
> >
> >
> > Best wishes
> > Dieter Doepfer
> >
> >
>
>
> =====
> synthfreak(parallel worlds)
> athens-greece
> 1 group owner
>
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