[sdiy] Homemade synth clone

Mattias Rickardsson mr at analogue.org
Sat Feb 16 10:53:50 CET 2019

Impressive undertaking, good luck with it! :-)
I hope you eventually find a good dual-pot solution.
My only advice in addition to what others are saying is that if you're into
recreating the panel, make sure to use the correct typefaces. The typeface
is the text's voice. Been seeing too many sad "clones" or "replicas"
blatantly/ignorantly using Arial lately... :'-(


On Fri, 15 Feb 2019 at 15:03, 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:
> - do you guys know of any error, inconsistency or omissions in the
> schematics available on the Web other than what can be found in the
> factory service bulletins (autotune update, etc)?
> - anyone got a spare LT-1604 fluorescent display that are willing to sell?
> - any hints from anyone that already tried something similar?
> - I know there are a few modifications to the voice cards that improve
> stability, but could not find detailed info. Is anyone familiar with
> these modifications?
> Cheers and thanks!
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