[sdiy] Homemade synth clone

john slee indigoid at oldcorollas.org
Sat Feb 16 10:49:21 CET 2019

I haven't tried them myself but Alpha make (or made? Can't find it on their
website anymore, hrm... but lots of suppliers claim to still stock them) a
dual-concentric pot:


I don't think there are many knob choices.


On Sat, 16 Feb 2019 at 18:03, <rsdio at audiobanshee.com> wrote:

> Great project. I have a few ideas:
> A) design a smaller board for the frequency pot(s) so that you can replace
> them later if you happen to find a dual concentric. There aren’t that many
> wires for a pot, so it shouldn’t be complex. Of course, your front panel
> will have to adapt to change from two separate pots to a single dual
> concentric.
> B) I’d be tempted to collapse most of the digital parts into a modern
> micro controller, assuming that everything you need can be found in one
> chip. Most of the processor peripherals on vintage synths are now available
> in multiples inside modern chips. Even if one or two subsystems are
> missing, it’s still easier to interface those to a modern micro controller
> using a parallel bus peripheral. Then your board will be much smaller and
> much less expensive to build.
> C) Digital noise should be easy to duplicate without the original chip.
> Ben covered that topic rather well.
> Sounds like fun!
> Brian Willoughby
> On Feb 15, 2019, at 6:02 AM, Luís Marka <luis.marka at terra.com.br> wrote:
> > Hi gang,
> >
> > Just started a pretty complex project: cloning a Memorymoog. With the
> recent availability of CEM ICs, think this is pretty much feasible now. A
> lot of work and a mountain of components, of course, but still possible.
> >
> > Over the last few days I managed to try Kicad for the first time (have
> been using Eagle for a long time but the Memorymoog boards are too large
> for my Eagle license) and recreate the digital board. I am halfway thru the
> task; see attached a screenshot of what I got so far!
> >
> > The only parts I was not able to source yet are the 14-segment
> fluorescent display, and the dual concentric frequency potentiometers. For
> now I am going to replace the display with a larger 14 segment LED display,
> and maybe use two separate potentiometers for frequency ("Coarse" and
> "Fine"). Also, the noise generator MM5837 seems to be made of Unobtanium.
> Will use an Electrodruid NOISE 1B chip instead!
> >
> > I would like to ask the list:
> >
> > - any hints from anyone that already tried something similar?
> >
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