Doepfer posts the schematic of the internal workings of the Fatar assembly. Not
complicated but plenty of parallel switch closures with diodes from the 2x61 notes shown.
The system is scanning all the contacts looking for closure of each specific switch pair
which have a midi note mapped to them inside the Doepfer sub assembly/controller. The
difference between this digital-kbd and the analogue type of keyboard you want is the
lack of the resistor ladder to furnish the change of 1volt/octave change of output from a
common pitch bus.
If you wanted to butcher such a device, you are on your own, but one might think you
could replace the diodes-warranty void- with suitable resistors to constitute the required
ladder and sum the output to feed to your monophonic controller. I paraphrase here, but
surely it's liable to be a bit more complicated than this but that's the gist of it. I'm not a
service tech mind you but you would have a clean assembly but could destroy the Fatar if
you weren't careful. Again warranty void once you start soldering. Doepfer route is plug
and play no soldering but will require decoding midi to cv/gate/trigger.
Depends on what you want to put into it and what you expect out at jobs end, how much
DIY re-invention you undertake.
I have a pdf here but will forward directly to your address instead of further annoying the
group. Probably really an MFOS post if there is such a group mind you after all this text.
Best of luck
c~h
complicated but plenty of parallel switch closures with diodes from the 2x61 notes shown.
The system is scanning all the contacts looking for closure of each specific switch pair
which have a midi note mapped to them inside the Doepfer sub assembly/controller. The
difference between this digital-kbd and the analogue type of keyboard you want is the
lack of the resistor ladder to furnish the change of 1volt/octave change of output from a
common pitch bus.
If you wanted to butcher such a device, you are on your own, but one might think you
could replace the diodes-warranty void- with suitable resistors to constitute the required
ladder and sum the output to feed to your monophonic controller. I paraphrase here, but
surely it's liable to be a bit more complicated than this but that's the gist of it. I'm not a
service tech mind you but you would have a clean assembly but could destroy the Fatar if
you weren't careful. Again warranty void once you start soldering. Doepfer route is plug
and play no soldering but will require decoding midi to cv/gate/trigger.
Depends on what you want to put into it and what you expect out at jobs end, how much
DIY re-invention you undertake.
I have a pdf here but will forward directly to your address instead of further annoying the
group. Probably really an MFOS post if there is such a group mind you after all this text.
Best of luck
c~h
--- In cgs_synth@yahoogroups.com, "waynerdlance" <lance.iden@...> wrote:
>
> i actually posted on a couple forums. now that i read the first post i wasnt to specific.
> thanks for your input and im curious what the actuall switch mechanism.s consist of on
a
> midi keyboard. maybe it could be adapted. anyways anyone with a schematic or a
> password to dowload a schematic/mechanical design from the FATAR site would be
> awesome.
>
> Thanks Lance
>
>
>
>
> --- In cgs_synth@yahoogroups.com, "x24holsey" <waveguide@> wrote:
> >
> > Lance,
> >
> > Since we're on the cgs-synth mail group I thought you were referring to Ken's small
> mini
> > keyboard project board. Your verbage suggested the MFOS board mind you.
> >
> > You used to be able to buy when Pratt-Read was the keyboard manual supplier to the
> > planet, such an item. Most I am aware of are Midi. You might cannibalize an otherwise
> > written off vintage synth for cheap, if you dare and salvage the keyboard assembly.
> >
> > Not that much of a service tech to point you at modern sources of any suitable "OEM"
> > keyboard assembly that isn't midi'd out already.
> >
> > Otherwise you might find simple switches of some kind for a eclectic DIY touch
> keyboard
> > which appeals to me somehow, ... one day. Maybe someone else listening can be
more
> > helpful.
> >
> > --- In cgs_synth@yahoogroups.com, "waynerdlance" <lance.iden@> wrote:
> > >
> > > im actually looking for a keyboard that would be compatible with the mfos 1v/oct
> > > keyboard controller pcb. ive seen the fatar keyboards on the doepfer site but i cant
> find
> > a
> > > schematic for the actual outputs of the keyboard. im looking for a single buss
> keyboard?
> > i
> > > dont really want to go the keyboard/midi/cv route for simplicities sake.
> > >
> > > Thanks Lance Iden
> > >
> > >
> > >
> > >
> > > --- In cgs_synth@yahoogroups.com, "x24holsey" <waveguide@> wrote:
> > > >
> > > > --- In cgs_synth@yahoogroups.com, "waynerdlance" <lance.iden@> wrote:
> > > > >
> > > > > hey just wondering if anyone knows of a source for compatible keybaord
> > assemblies
> > > for
> > > > use
> > > > > with the keyboard controller. im looking for something new (dont really want to
> > > dissect
> > > > other
> > > > > keyboards) any leads would be greatly appreciated.
> > > > > Thanks Lance Iden
> > > > >
> > > >
> > > > It feels like you might be looking for some of the more DIY switch assemblies to
> make
> > a
> > > > small touch keyboard/button so have a look at the Doepfer site.
> > > >
> > > > http://www.doepfer.de/home_e.htm
> > > >
> > > > Doepfer sell plenty of DIY esoterica components in addition to real Fatar keyboard
> > > manuals
> > > > with plug-in sub-modules. Specific to what you mention above, they do have an
> 8x8
> > > switch
> > > > matrix: CTM64 button board , that might be along the lines of what you need.
> > > >
> > >
> >
>