Though your argumentation is a bit "strange" from my point of view I'll
answer nevertheless:

We had a +5V supply available and you still find it on our website:

www.doepfer.com > PRODUCTS > A-100 > Accessories > A-100NT5

But it is marked "no longer available" as the sales were extremely poor. It
took more than 5 years to sell the first series of these supplies. All A-100
rear panels were equipped with four holes to mount the A-100AD5 (in the
meantime these holes are no longer available in the rear panels) and the
A-100 standard PSU was prepared to connect the A-100NT5.
We could simply "resurrect" the A-100NT5 provided that there are sufficient
inquiries. But apart from this fiendly request nobody was asking for a +5V
supply during the last few months (or even years).
And if you look at our special list (Sonderliste) you will see that we offer
+5V supplies since many months for free to the "Volk" provided that the user
is able to install the supply himself:
www.doepfer.com > SPECIALS > "2-fach-Netzteil, Eingang 230V AC, Ausgang
+5V/2.5A stabilisiert"
(i.e. dual supply, 230 V mains voltage, +5V/2.5A stabilized)

And there is mentioned that it can be used for A-100 too if +5V are
necessary.

Best wishes
Dieter Doepfer

> -----Ursprüngliche Nachricht-----
> Von: Doepfer_a100@yahoogroups.com
> [mailto: Doepfer_a100@yahoogroups.com ]Im Auftrag von sonicwarrior@...
> Gesendet: Mittwoch, 10. November 2010 11:46
> An: Doepfer_a100@yahoogroups.com
> Betreff: Re: 1 Request for a +5V/+12V/-12V power supply in
> the standard housings
>
>
> Hi,
>
> the chicken/egg problem is discussed at Muffwiggler's, too. I'll
> just quote daverj from the 'some frustration w/ Zeus and POWER' thread:
> http://www.muffwiggler.com/forum/viewtopic.php p=327649#327649
>
> <quote>
> The 5 volt power issue being talked about in a couple of other
> threads is more about planning for the future, and maybe changing
> things for the better. The current state of affairs with 5 volts
> is in a "chicken or the egg" state.
>
> 1 - manufactures who design a module that could use lots of 5
> volts, only sometimes use the 5 volt bus because the cases today
> typically have no 5 volts or a limited amount of it.
>
> 2 - the case manufacturers don't add large 5 volt supplies
> because the majority of modules don't use the 5 volt bus.
>
> 3 - loop back to #1
>
> The 5 volt thread is trying to convince people to break the above
> cycle by making large 5 volt supplies standard so that module
> designers will start using the bus more.
> </quote>
>
> Btw. the ZEUS power supply from Tip Top Audio already has a
> dedicated +5V power supply, see:
> http://www.muffwiggler.com/forum/viewtopic.php t=23105
>
> The module manufacturers won't change anything until there is a
> broad on-board supply for +5V which means that Doepfer as the
> Eurorack grandfather has to step in or nothing will ever change.
>
> I myself will stop buying any housing until there is a +5V supply
> in there.
> I will also not buy any module with an on-board +5V regulator
> which draws current from the +12V rail without the option of
> using the +5V rail instead. That concretely means I won't buy the
> A-187-1 and A-189-1 which are on my want list until then.
>
> Wir sind das Volk!
>
> Greetings
> Joachim
>
> -------- Original-Nachricht --------
> > Datum: Tue, 09 Nov 2010 19:38:51 -0800
> > Von: James Husted < james.husted@... >
> > An: Doepfer_a100@yahoogroups.com
> > Betreff: Re: 1 Request for a +5V/+12V/-12V power
> supply in the standard housings
>
> > As far as I know there is only one module in the Doepfer lineup that
> > requires a separate +5V supply and that is the MIDI>CV
> converter. Of all the
> > manufacturers out there I think that Analogue Solutions and
> Analog Systems are
> > the only companies in the eurorack format that require a separate +5v
> > signal - all the digital modules I know of convert the +12V to
> +5 on the module
> > so the "not supporting the +5V rail" is a industry trend and not just
> > something Doepfer is doing. What Digital modules out there
> would use this
> > separate +5V line if there was one Is the Digital
> ground>Analog ground a real
> > problem on the modules that do convert it onboard. I assume it
> is isolated
> > on them. I think the major problem is that the digital modules that do
> > convert the +12v make an extra load for that side of the
> supply. More should
> > convert from the -12v supply to balance it out. There are very
> few modules
> > that even offer an option to choose to use the +5v supply bus -
> IIRC Scott
> > Harvestman said he once offered a jumper option on one of his
> modules and
> > nobody used it so he discontinued it. Until the module makers
> all convert over
> > to using the +5v bus there is no reason to burden the rest of the
> > non-digital users with the expense of a separate supply.
> > -James
> >
> > **Disclaimer** As you can see from my sig I design for
> Synthwerks and have
> > to disclose that we make a module (the PC5V) that converts the
> +12v supply
> > to +5v and pipes it to the bus (and front panel with a level control. I
> > have to admit it is not a big seller for these reasons. There
> seems to be a
> > lot of modules that require it.
> >
> >
> > James Husted
> > Designer, Synthwerks LLC
> > www.synthwerks.com
> > james@...
> > synthwerks@...
> >
> >
> > On Nov 9, 2010, at 1:31 PM, Joachim wrote:
> >
> > > Hello there,
> > >
> > > there is currently a lot of talk going on about Doepfer not supporting
> > > the +5V rail with the standard housings. Here is the thread:
> > > http://www.muffwiggler.com/forum/viewtopic.php t=24399
> > >
> > > Short summary:
> > >
> > > a. There is definitely a demand that the power supply in the standard
> > > housings supports +5V
> > > b. +5V is used for digital modules and therefore should have
> a separate
> > > digital ground on the whole way (module => cable => bus board
> => power
> > > supply) to avoid digital noise coming over the common ground.
> > >
> > > Necessary steps:
> > >
> > > For a:
> > > 1. Using either tri output power supplies like the ready-made
> Meanwell
> > > T-60C or an additional 5V power supply, e.g. the Meanwell S-25-5 with
> > > 5,0A of +5V. Meanwell is just an example, there are several other
> > > manufacturers like Power One and a current transformer with
> > > +5V/+12V/-12V outputs could be used, too, of course.
> > >
> > > For b:
> > > 2. Change the specification for the power connection so that
> one of the
> > > three ground lines is reserved for the digital ground while the other
> > > two remain for the analog ground. It would still be compatible to the
> > > old specification with the downside of more noise which is
> what happens
> > > at the moment anyway when the +5V is taken from the +12V rail
> without a
> > > separate digital ground.
> > > 3. Change the bus boards to implement the separate digital ground.
> > > 4. Change the existing +5V modules to make use of the
> separate digital
> > > ground.
> > >
> > > While we are at the subject of a bus board change: There is a
> big demand
> > > for keyed connectors, too. They would help to avoid wrong connections
> > > for modules which use the specification, force the
> manufactures who are
> > > ignoring the key position specification to support it and help to
> > > connect the modules which is currently a pain in the a**.
> > > I myself would gladly pay the slightly higher price for keyed
> connector
> > > bus boards.
> > >
> > > Cheers
> > > Joachim
> > >
> > >
> > > ------------------------------------
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> > >
> > >
> > >
> >
> >
> >
> > ------------------------------------
> >
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> >
> >
> >
>
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