[sdiy] Moog Memorymoog clone almost completed

Luís Marka luis.marka at gmail.com
Fri Oct 16 17:08:32 CEST 2020 

Keyboard was donated by a dead Juno 106, only had to rewire its connectors
to match the Memorymoog PCB. The logos in the back are nearly done, I still
have to get the side aluminum cheeks done before I can send those + panel
logo plate for anodizing, and then I can apply the logo. Also, I have to
figure a way to apply the jack labels.

At first I was going to keep the same cabling as in the original. In fact,
I was expecting to be able to use my boards in any stock Memorymoog but the
cabling was an absolute mess, I simply had to improve it. All connectors
are now latched Molex Nanofit, much more reliable than the originals.

The heat sink is way too big, I know. I am still trying to find something
closer to the original, I am sure that if I try to hacksaw that dissipator
it will not be a nice, straight cut and will end up looking horrible. Only
decent option would be to use a milling machine! By the way, it seems to me
it generates less heat than an original Memorymoog, probably because modern
components have better specs. Deliberate modifications were the use of the
CMOS version for the Z80, CTC and EPROMs, as well as ALS-series for the
TTLs instead of LS whenever available. I believe this shaved off a few
watts from the +5V power.

Cheers!

[image: 20201015_152953-1328.jpg]

Em sex., 16 de out. de 2020 às 11:30, KRiSh <krish0005 at gmail.com> escreveu:

> Agree with Roman, your cabling job is much better than what you can see in
> the originals.
> My congratulations. Really an incredible work !
> What keyboard assembly did you use ?
> Now you'll also have that MemoryMoog logo done right ? :-D
>
> Make sure to send us audio demo, video even better !!
>
> K
>
> Il giorno ven 16 ott 2020 alle ore 12:49 Roman Sowa <modular at go2.pl> ha
> scritto:
>
>> That looks almost the same as original inside, except your wiring is
>> much cleaner. What a massive amount of work, I'm amazed by your
>> enthusiasm needed to finish it. I bet there were countles times when
>> anybody else would give up on this.
>>
>> Roman
>>
>> W dniu 2020-10-15 o 18:21, Luís Marka pisze:
>> > I can prepare a package with all Kicad files for boards, as well as the
>> > Autocad drawings for the case, metal and wood parts, and send it to
>> > anyone interested. Still need to find a way to get the buttons done, my
>> > attempts have not been successful so far.
>> >
>> > Obviously it uses a LOT of parts...
>> >
>> > Cheers!
>> >
>> >
>> > Em 10/15/2020 12:55 PM, ulfur hansson escreveu:
>> >> that is beeeeeyoond impressive!!!! such a quirky beast... ...I would
>> >> LOVE to hear what it sounds like compared to the one I have access to
>> >> at the moment.
>> >>
>> >> also, is this a one off, or potentially a project others could
>> >> participate in?
>> >>
>> >> you are insane, thank you for being crazy and cheers!
>> >>
>> >> fim., 15. okt. 2020 kl. 15:39 skrifaði Luís Marka
>> >> <luis.marka at gmail.com <mailto:luis.marka at gmail.com>>:
>> >>
>> >>     I used Bourns PTH901-030S-103B1. Ideally the shaft would have to
>> >>     be longer, at least 35mm but I could not find those.
>> >>
>> >>     It was impossible to find the original potentiometer with the
>> >>     built-in reduction gear so I had to improvise... have not done it
>> >>     yet, but I will add a few resistors to make a "coarse" and "fine"
>> >>     control in the same pot. Ideally the outer shaft will range from
>> >>     10 to 90, and the inner shaft will cover the +-10 range.
>> >>
>> >>     Cheers!
>> >>
>> >>
>> >>     Em 10/15/2020 12:24 PM, James Coplin escreveu:
>> >>>     Thats an astonishing large clone project - congrats on being
>> >>>     nearly finished. Where did you find the dual concentric pots?
>> >>>
>> >>>     James
>> >>>     On Oct 15, 2020, at 10:19 AM, "Luís Marka" <luis.marka at gmail.com
>> >>>     <mailto:luis.marka at gmail.com>> wrote:
>> >>>
>> >>>         Hi folks!
>> >>>
>> >>>         After dedicating some time to this project, my very own
>> >>>         Memorymoog clone is nearly completed! Still missing the
>> >>>         buttons, so far the 3D printed attempts turned out bad. Also,
>> >>>         the 9mm thickness aluminum side cheeks are not done, as well
>> >>>         as adaptors for the dual concentric frequency potentiometer
>> >>>         knobs.
>> >>>
>> >>>         It seems to be more stable than the old Memorymoog I used to
>> >>>         own a couple decades ago - no autotune update on that unit,
>> >>>         which is built into my clone. I get "6 tuned" at pretty much
>> >>>         every attempt, as long as I allow for some 15 to 20 minutes
>> >>>         warmup.
>> >>>
>> >>>         The sound is, as far as I can tell, exactly the same as a
>> >>>         stock Memorymoog: all circuits are exactly the same.
>> >>>
>> >>>         I tested several LEDs to decide on a color, and figured the
>> >>>         diffuse white looked better than the original red ones.
>> >>>
>> >>>         Cheers!
>> >>>
>> >>>
>> >>>
>>  ------------------------------------------------------------------------
>> >>>
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>> >>>         Synth-diy at synth-diy.org  <mailto:Synth-diy at synth-diy.org>
>> >>>         http://synth-diy.org/mailman/listinfo/synth-diy
>> >>>
>> >>     _______________________________________________
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>> >>
>> >>
>> >>
>> >> --
>> >> •
>> >> ulfurhansson.com <http://ulfurhansson.com/>
>> >> instagram.com/ulfur_ <http://instagram.com/ulfur_>
>> >> .•°~ Úlfur - Arborescence on Spotify
>> >> <https://open.spotify.com/album/118CEJliIg47Jcr70y7Kww>
>> >
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