[sdiy] ODP: Hammond Aurora Keybeds

[Phillip Gallo]

... and as memory serves, Allen Organ company did just that in the late
1970's, switching to matrixing keyboards in the early 1980's.

My first DIY digital keyboard (~1980) was a CMOS counter driving a raft of
CD4051 muxes to encode an old Vox Continental clavier.
1st keypress stopped the counter, latched the count value to a CD4050
buffer which drove 6 binary weighted resistor values (the 2 smallest values
getting two parallel buffers).
This 6 bit  keyboard eliminated years of Sample and Hold frustrations.  A
second version switched to CD 4067 mux's to reduce chip count.

p



On Wed, May 14, 2025 at 11:53 PM Roman via Synth-diy <
synth-diy at synth-diy.org> wrote:

> The best what you can do today is scan the keyboard digitally and use DAC
> as CV source. No analog keyboard circuitry ever designed will be comparably
> reliable. They would have gladly make keyboards that way back in the 1970's
> as well but the technology needed was too expensive.
>
> Roman
>
>
> ---- Użytkownik drheqx via Synth-diy napisał ----
>
> Hi all,
>
> I have the keybeds and draw bars etc. from a Hammond Aurora organ.
>
> These are not matrix type keybeds. Each key closes a switch to a common
> bus.
>
> Is this a good time for me to consider doing a volt
> /octave keyboard controller?
>
> I definitely don't want to midify these. That would be a waste.   I was
> considering building a voice per key synth because i love these key beds
> and it would be so unique, but I'm short on time like so many of us.
>
> Anyone know of a good kit to make a 1v/ oct controller, maybe with some
> added features.
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