Doepfer

For this I'd recommend another approach: Usage of several voltage reference
sources (e.g. TL431) with adjustable output voltages. For adjustment (e.g.
1.00V, 2.00V ...) I'd recommend 25-turn precision trimming potentiometers.
This avoids the need of 0.1% resistors with the right values. The TL431 data
sheet can be found in the internet.

Best regards
Dieter Doepfer
Doepfer Musikelektronik GmbH
Email address: hardware@doepfer.de
Web Site: www.doepfer.com

P.S. we have been working hard during the last few days. Now I can confirm
that these devices will be shown at NAMM (provided that they do not get lost
during shipment ...):

A-101-9 Universal Vactrol Module with some examples (probably A-143-1,
A-162)
A-188-1A 1024 stages BBD
A-188-1B 2048 stages BBD
A-1?? Switched Capacitor Filter
A-1?? Quadrature Thru-Zero VCO / 12dB VCF, can be switched between lin/log
control and between VCF (12dB LP/BP) and Sine/Cosine VCO
CTM relay board
MTC relay board
d3c
(and maybe TKB Version 2, but we are not sure if it will work in USA with
115V/60Hz as we use the hum noise induced by the mains leads to the human
body and that much different for 115V/60Hz compared to 230V/50Hz)


> -----Ursprüngliche Nachricht-----
> Von: Doepfer_a100@yahoogroups.com
> [mailto:Doepfer_a100@yahoogroups.com]Im Auftrag von n keller
> Gesendet: Montag, 19. Dezember 2005 22:17
> An: Doepfer_a100@yahoogroups.com
> Betreff: RE: [Doepfer_a100] Re: high precision adder?
>
>
>   I would like a module with some precision constants available,
> perhaps a
> 4HP module with CV Source outputs for precise whole numbers like
> -3,-2,-1,1,2,3,4,5VDC.  I'm guessing this is a very simple module
> to make,
> like some of the other recent suggestions.  I think it would be
> useful in my
> system, especially if a precision adder was, .....well, added.
>
>   Perhaps someone can make a suggestion on how to slap one of
> these together
> and I'll make one up.  Let's see.....we've got 12V right on the rails.
> I've got my A-180 style faceplate and sockets.  Is it a simple matter of
> connecting -12V or 12V through the "correct" 0.1% resistor to
> each socket,
> or should I buffer the -/+12 through a dual op-amp in the 1Xamplifier
> configuration as shown on Doepfer DIY page before branching off
> through the
> 0.1% resistors??   Can anyone with a workbench find some resistor
> values and
> post them?
>
> nick
>
>
> >From: "selfoscillate" <synaptic_music@yahoo.com>
> >Reply-To: Doepfer_a100@yahoogroups.com
> >To: Doepfer_a100@yahoogroups.com
> >Subject: [Doepfer_a100] Re: high precision adder?
> >Date: Mon, 19 Dec 2005 13:42:46 -0000
> >
> >
> >hello dieter,
> >
> >with the right amount of jacks this module would close a real gap
> >in the a100 module range. what i always wanted is a buffered
> >version of an a180 and a precision adder could be used that
> >way too, if it had enough jacks.
> >
> >how about three inputs, four buffered outputs and one
> >inverted output? could be done on a 4 te faceplate.
> >if you manufacture a module with similar specs, then
> >i'll buy a minimum of six modules for my system right away.
> >
> >best wishes
> >
> >ingo
> >
> >
> >
> >
> >--- In Doepfer_a100@yahoogroups.com, "Dieter Doepfer" <hardware@d...>
> >wrote:
> > >
> > > An precision adder is from the technical point of view no problem
> >(nothing
> > > but the CV mixer on the DIY page but without attenuators and
> >precision 0.1%
> > > resistors and high quality OpAmps). If there are sufficient
> >inquiries we
> > > could develop such a module. How about a poll ?
> > >
> > > Best wishes
> > > Dieter Doepfer
> > >
> > > > -----Ursprüngliche Nachricht-----
> > > > Von: Doepfer_a100@yahoogroups.com
> > > > [mailto:Doepfer_a100@yahoogroups.com]Im Auftrag von okiikahuna
> > > > Gesendet: Samstag, 17. Dezember 2005 23:16
> > > > An: Doepfer_a100@yahoogroups.com
> > > > Betreff: [Doepfer_a100] Re: high precision adder?
> > > >
> > > >
> > > > Ingo,
> > > >
> > > > I think that this is an absolute necessity. It could also serve
> >as a
> > > > buffer, since the CV output of some modules, like the midi to CV
> > > > module, drops if fed into too many oscilators and filters and
> >such.
> > > >
> > > > There are not a lot of good alternatives out there: Analogue
> > > > Solutions makes an 8hp CV mixer that is completely unusable for
> >this
> > > > purpose because it is WAY too imprecise. (don't bother trying it,
> >I
> > > > already have)  The Analogue Systems Buffer is much more precise,
> >but
> > > > you can't mix more than one voltage.   The Doepfer Buss Access
> >mixes
> > > > and buffer, but still not enough inputs.  So, there is a real need
> > > > for this.
> > > >
> > > > It could be made as a 4hp module, since all you would need are
> > > > inputs and outputs. (don't need precision if you are gonna screw
> >it
> > > > up with pots anyway) An inverting output might be nice.
> > > >
> > > > K
> > > >
> > > >
> > > > --- In Doepfer_a100@yahoogroups.com, "selfoscillate"
> > > > <synaptic_music@y...> wrote:
> > > > >
> > > > >
> > > > > hello list,
> > > > >
> > > > > what would you guys think about a high precision adder/mixer?
> > > > > such a module is very useful for adding pitch voltages
> > > > > for vco's. standard mixers are just not precise enough
> > > > > and so they often screw a 1v/oct quantized voltage.
> > > > >
> > > > > best wishes
> > > > >
> > > > > ingo
> > > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > > Yahoo! Groups Links
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > >
> >
> >
> >
> >
> >
>
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