[sdiy] ODP: Hammond Aurora Keybeds

[Roman Sowa]

Yes, this way you can take crappy DAC and calibrate each step 
individually with multimeter.
Or if you select DAC with really good linearity you can just multiply 
note number with step size.

Digital CV keyboard does not even require a microcontroller, just a 
small bunch of low end logic chips and parallel input DAC. I have this 
project in my head for too many years now.

Roman

W dniu 2025-05-15 o 14:23, drheqx pisze:
> Thank you Roman. So a lookup table then for the voltage values?
> 
> Mike
> 
> 
> 
> On Thu, May 15, 2025 at 1:55 AM Roman via Synth-diy 
> <synth-diy at synth-diy.org <mailto: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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