[sdiy] Homemade synth clone

rsdio at audiobanshee.com rsdio at audiobanshee.com
Sat Feb 16 08:02:21 CET 2019

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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