Doepfer

--- Dieter Doepfer <hardware@doepfer.de> wrote:
> From: "Dieter Doepfer" <hardware@doepfer.de>
> To: "Bakis Sirros" <synth_freak_2000@yahoo.com>
> 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
[Doepfer_a100] group owner

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