<div dir="ltr">... and as memory serves, Allen Organ company did just that in the late 1970's, switching to matrixing keyboards in the early 1980's.<div><br></div><div>My first DIY digital keyboard (~1980) was a CMOS counter driving a raft of CD4051 muxes to encode an old Vox Continental clavier. </div><div>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).</div><div>This 6 bit keyboard eliminated years of Sample and Hold frustrations. A second version switched to CD 4067 mux's to reduce chip count.</div><div> </div><div>p</div><div><div><br><div><br></div></div></div></div><br><div class="gmail_quote gmail_quote_container"><div dir="ltr" class="gmail_attr">On Wed, May 14, 2025 at 11:53 PM Roman via Synth-diy <<a href="mailto:synth-diy@synth-diy.org">synth-diy@synth-diy.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><p dir="ltr" style="margin-top:0px;margin-bottom:0px">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.</p>
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<p dir="ltr" style="margin-top:0px;margin-bottom:0px">Roman </p><br><br>---- Użytkownik drheqx via Synth-diy napisał ----<br><br>Hi all,<div dir="auto"><br></div><div dir="auto">I have the keybeds and draw bars etc. from a Hammond Aurora organ. </div><div dir="auto"><br></div><div dir="auto">These are not matrix type keybeds. Each key closes a switch to a common bus. </div><div dir="auto"><br></div><div dir="auto">Is this a good time for me to consider doing a volt</div><div dir="auto">/octave keyboard controller? </div><div dir="auto"><br></div><div dir="auto">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. </div><div dir="auto"><br></div><div dir="auto">Anyone know of a good kit to make a 1v/ oct controller, maybe with some added features. </div>
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