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 Forum index » DIY Hardware and Software
MiniMoog clone
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sompost



Joined: Aug 17, 2010
Posts: 52
Location: Switzerland

PostPosted: Wed Apr 20, 2016 1:24 pm    Post subject: MiniMoog clone Reply with quote  Mark this post and the followings unread

I've got plenty of unfinished business, but there's always time to explore new projects.

Recently, I've stumbled over various sites by people who built MiniMoog clones, and I liked very much what I saw. To explore the feasibility of building one myself I would like to research a few options.

On the intertubes I found PCB designs of all boards contained in a MiniMoog, except that of the VCO that I'd use if I ever going to build one -- namely the the "old" VCO using the CA3046. The only VCO layouts I could find use the uA726, and I don't want to use that one (or the discreet one that I don't want to use either).

So I'd like to ask if anyone has got a PCB layout of the "old" VCO (CA3046-version) that could be posted here, or alternatively a picture of the VCO board's back side showing the traces. I'd take it from there.

Thanks, Ralph

_________________
Built: MFOS SLMS plus, SL Ultimate & Expander, 10 step seq; SLMS MkII; PAiA FatMan, Mutable-Instruments Shruthi-1
Building: Maddox MonoWave; Auduino; ASM-2; Minimoog Clone; Jasper Wasp Clone
Backlogging: MFOS 16 step seq; TH SN Voice; Takeda One Board Farm; Okita Vocoder; Page TR-9090; TH GM Voice, AY Voice
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AlanP



Joined: Mar 11, 2014
Posts: 413
Location: New Zealand
Audio files: 26

PostPosted: Wed Apr 20, 2016 10:43 pm    Post subject: Reply with quote  Mark this post and the followings unread

jdesgoulet on muffs is working on a two-PCB Minimoog clone -- I don't have the link handy, though. He's (eventually) going to sell them (not quite yet...)
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sompost



Joined: Aug 17, 2010
Posts: 52
Location: Switzerland

PostPosted: Thu Apr 21, 2016 3:20 am    Post subject: Reply with quote  Mark this post and the followings unread

Ah, yes, that one

https://www.muffwiggler.com/forum/topic-126711.html

My future self has already ordered.

_________________
Built: MFOS SLMS plus, SL Ultimate & Expander, 10 step seq; SLMS MkII; PAiA FatMan, Mutable-Instruments Shruthi-1
Building: Maddox MonoWave; Auduino; ASM-2; Minimoog Clone; Jasper Wasp Clone
Backlogging: MFOS 16 step seq; TH SN Voice; Takeda One Board Farm; Okita Vocoder; Page TR-9090; TH GM Voice, AY Voice
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sompost



Joined: Aug 17, 2010
Posts: 52
Location: Switzerland

PostPosted: Fri Apr 29, 2016 11:30 pm    Post subject: Reply with quote  Mark this post and the followings unread

Ok, after I've more or less finished making stripboard layouts of all known MiniMoog boards (add here your thoughts), I've finally found an image of a PCB layout of the "old" VCO on Matrixsynth, that I can use as a template for tracing one myself (the assembly guide and all the rest is avaliable at Fantasy Jack's).

For the remaining boards, Crazy Patroche has very nice PCB layouts in the style of the original MiniMoog boards. I'm not so much into self-etching but the PDFs he provides are easily convertable to Gerbers, so that's taken care of.

So now I have the choice of using stripboards (cheaper, much more work) or PCBs (easier to stuff, but much more expensive). Or I can wait, until the board by jdelgoulet over at MuffWiggler is available.

Anyway, if you do a recreation of a vintage synth, do you stay true to the original (as far as reasonable) or do you improve on it, e.g. use 1% resistors everywhere, even if the original uses 5% ones, and so on? I don't suppose using 1/4W resistors instead of the 1/2 W ones listed in the parts list would make any difference, or would it? I also see that none of the op-amps have decoupling capacitors next to the power lines. Would you add them?

Cheers, Ralph

_________________
Built: MFOS SLMS plus, SL Ultimate & Expander, 10 step seq; SLMS MkII; PAiA FatMan, Mutable-Instruments Shruthi-1
Building: Maddox MonoWave; Auduino; ASM-2; Minimoog Clone; Jasper Wasp Clone
Backlogging: MFOS 16 step seq; TH SN Voice; Takeda One Board Farm; Okita Vocoder; Page TR-9090; TH GM Voice, AY Voice
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Broadwave



Joined: Feb 16, 2007
Posts: 345
Location: Manchester UK
Audio files: 6

PostPosted: Sun May 01, 2016 1:43 am    Post subject: Reply with quote  Mark this post and the followings unread

I tried to build the original VCOs for my MM clone, but I had a bunch of fake u726, so I gave up and used modified Roland M100 VCOs. They sound great and are just as unstable as the originals Wink

Posted Image, might have been reduced in size. Click Image to view fullscreen.

Posted Image, might have been reduced in size. Click Image to view fullscreen.

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Kronos 2-88, Kronos 61, Studiologic Sledge V2/SL, Broadwave ARP 2600EX, Broadwave 18U ARP based Eurorack Modular, Broadwave Minimoog Clone, GEM S2 Turbo.

Synth DIY Projects

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LFLab



Joined: Dec 17, 2009
Posts: 440
Location: Rosmalen, Netherlands

PostPosted: Sun May 01, 2016 2:02 am    Post subject: Reply with quote  Mark this post and the followings unread

sompost wrote:
Ok, after I've more or less finished making stripboard layouts of all known MiniMoog boards (add here your thoughts)


Hi Ralph,

I have a board design for the Minimoog VCF + VCA, all discrete, so if you want any mixing or buffering, you'd need to add that on a separate board (simple enough). I have a board for the latter as well, can be added to the VC+VCA main board.

The thing is though, I have none of the boards left, if you have some time, I can reorder at iTEAD (takes about a month), saves you a lot of time stripboarding, and you can start matching transistors now Very Happy

This is it ("Look Ma, no IC's!"):
Posted Image, might have been reduced in size. Click Image to view fullscreen.
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sompost



Joined: Aug 17, 2010
Posts: 52
Location: Switzerland

PostPosted: Sun May 01, 2016 1:05 pm    Post subject: Reply with quote  Mark this post and the followings unread

AndyR1960: Wow, I'd be glad if my clone ended up just half as cool (and unstable...) as yours.

LFLab: Thanks, but don't rush and order more PCBs just yet -- not for me anyway. As I've written above, I finally did find a PCB layout, so I don't have to rely on stripboards, anymore. Although, come to think of it, a stripboard MiniMoog has a kind of subversive feel to it...

Ralph

_________________
Built: MFOS SLMS plus, SL Ultimate & Expander, 10 step seq; SLMS MkII; PAiA FatMan, Mutable-Instruments Shruthi-1
Building: Maddox MonoWave; Auduino; ASM-2; Minimoog Clone; Jasper Wasp Clone
Backlogging: MFOS 16 step seq; TH SN Voice; Takeda One Board Farm; Okita Vocoder; Page TR-9090; TH GM Voice, AY Voice
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sompost



Joined: Aug 17, 2010
Posts: 52
Location: Switzerland

PostPosted: Wed May 04, 2016 11:11 pm    Post subject: Reply with quote  Mark this post and the followings unread

Here's my MiniMoog VCO layout. It looks awful - no straight lines. I'll fix that. Also, I still have to check it with the schematics. But at least, I'm getting somewhere. Wink

Don't ask me how I made this (in PowerPoint). Yes, I'm going to seek medical assistance.

Ralph


MiniMoogVCO.png
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_________________
Built: MFOS SLMS plus, SL Ultimate & Expander, 10 step seq; SLMS MkII; PAiA FatMan, Mutable-Instruments Shruthi-1
Building: Maddox MonoWave; Auduino; ASM-2; Minimoog Clone; Jasper Wasp Clone
Backlogging: MFOS 16 step seq; TH SN Voice; Takeda One Board Farm; Okita Vocoder; Page TR-9090; TH GM Voice, AY Voice
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LFLab



Joined: Dec 17, 2009
Posts: 440
Location: Rosmalen, Netherlands

PostPosted: Wed May 04, 2016 11:59 pm    Post subject: Reply with quote  Mark this post and the followings unread

Wow! Awesome PowerPoint skills!
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AlanP



Joined: Mar 11, 2014
Posts: 413
Location: New Zealand
Audio files: 26

PostPosted: Thu May 05, 2016 1:10 am    Post subject: Reply with quote  Mark this post and the followings unread

Shocked You did that in powerpoint? I've heard of using Excel, but not powerpoint...
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nickster



Joined: Feb 11, 2010
Posts: 10
Location: sweden

PostPosted: Tue May 24, 2016 3:27 pm    Post subject: Keyboard for the mini Reply with quote  Mark this post and the followings unread

I'm curious about how to implement a keyboard for the Minimoog clone I'll be making. I'll be building from jdesgoulet's pcb as on Muffs or from the Crowminius project. As they are using Fatar Keybeds for the new mini then my thoughts were to get one of these. But how would these be set up to work with either of these 2 diy pcbs?
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sompost



Joined: Aug 17, 2010
Posts: 52
Location: Switzerland

PostPosted: Tue May 24, 2016 11:12 pm    Post subject: Reply with quote  Mark this post and the followings unread

I haven't looked into keyboards yet, but as far as I understand, there's these two options:

a) Keybed has a diode matrix-type encoder built in (the connector has far fewer lines than there are keys). In this case people have built small keyboard scanner boards using a microcontroller and a DAC to output a control voltage (see Tauntek's Minimoog for an example). These are usually salvaged keybeds from a defunct keyboard or midi controller.

b) Keybed has a switch per key. These switches are then connected to a resistor ladder in order to get approptiate control voltages (see original Minimoog schematics for details). I think the Katar keybeds are of this type.

Take with a few grains of salt, because -- as I've said -- I haven't looked into that yet.

_________________
Built: MFOS SLMS plus, SL Ultimate & Expander, 10 step seq; SLMS MkII; PAiA FatMan, Mutable-Instruments Shruthi-1
Building: Maddox MonoWave; Auduino; ASM-2; Minimoog Clone; Jasper Wasp Clone
Backlogging: MFOS 16 step seq; TH SN Voice; Takeda One Board Farm; Okita Vocoder; Page TR-9090; TH GM Voice, AY Voice
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nickster



Joined: Feb 11, 2010
Posts: 10
Location: sweden

PostPosted: Wed May 25, 2016 11:55 am    Post subject: Reply with quote  Mark this post and the followings unread

Thanks, great food for thought. I see that the Crominius project already has a Midi converter built into the pcb design so in theory I imagine one can just plug in a Midi board into this. Although there is still the question of how the wheels work as I don't think Crow set up these to be midi controlled. So these would need to be either salvaged wheels housings or if Deopfer still offer them one of theirs. The hard part of the mini will be getting the housing and switches right. Much to do. Shocked
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sompost



Joined: Aug 17, 2010
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Location: Switzerland

PostPosted: Mon May 30, 2016 7:21 am    Post subject: Reply with quote  Mark this post and the followings unread

Two weeks ago, I sent two of the smaller boards (power and VCF) to the EasyEDA PCB manufacturing service, and they have just returned. They're looking great! Cool

I made Gerber files based on the PDFs on Crazy Patroche's web site (I got his permission to reproduce them). I modified the design to include 0.156" edge connectors like in the original Minimoog (Patroche uses 0.1" pin headers as connectors). Also, I had to change the lettering on the solder side to use vector fonts.

I'll finish the VCO board now (I don't use Patroche's version), and then send it and all the remaining boards for manufacturing. Hololodioh!!

_________________
Built: MFOS SLMS plus, SL Ultimate & Expander, 10 step seq; SLMS MkII; PAiA FatMan, Mutable-Instruments Shruthi-1
Building: Maddox MonoWave; Auduino; ASM-2; Minimoog Clone; Jasper Wasp Clone
Backlogging: MFOS 16 step seq; TH SN Voice; Takeda One Board Farm; Okita Vocoder; Page TR-9090; TH GM Voice, AY Voice
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sompost



Joined: Aug 17, 2010
Posts: 52
Location: Switzerland

PostPosted: Fri Jun 03, 2016 11:19 am    Post subject: Reply with quote  Mark this post and the followings unread

In order not to pollute this forum with my inane mumble, I've opened a page at my DIY blog to tell tales of misery and imagination. And Minimoog replicas. It's here: http://inaptlycrafted.blogspot.com/2016/06/minimoog-replica.html .

Nice weekend everyone!

Ralph

_________________
Built: MFOS SLMS plus, SL Ultimate & Expander, 10 step seq; SLMS MkII; PAiA FatMan, Mutable-Instruments Shruthi-1
Building: Maddox MonoWave; Auduino; ASM-2; Minimoog Clone; Jasper Wasp Clone
Backlogging: MFOS 16 step seq; TH SN Voice; Takeda One Board Farm; Okita Vocoder; Page TR-9090; TH GM Voice, AY Voice
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sompost



Joined: Aug 17, 2010
Posts: 52
Location: Switzerland

PostPosted: Wed Jun 08, 2016 4:59 am    Post subject: Reply with quote  Mark this post and the followings unread

Looking good! Mr. Green Mr. Green Mr. Green


MMBoards.jpg
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Top row: oscillator, filter/VCA. Bottom row: rectifier, octave buffer, dual contour and power/noise.
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_________________
Built: MFOS SLMS plus, SL Ultimate & Expander, 10 step seq; SLMS MkII; PAiA FatMan, Mutable-Instruments Shruthi-1
Building: Maddox MonoWave; Auduino; ASM-2; Minimoog Clone; Jasper Wasp Clone
Backlogging: MFOS 16 step seq; TH SN Voice; Takeda One Board Farm; Okita Vocoder; Page TR-9090; TH GM Voice, AY Voice
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AlanP



Joined: Mar 11, 2014
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Location: New Zealand
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PostPosted: Wed Jun 08, 2016 10:45 am    Post subject: Reply with quote  Mark this post and the followings unread

I'm impressed Smile
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duff



Joined: Jun 02, 2013
Posts: 11
Location: UK

PostPosted: Sun Jun 12, 2016 5:04 am    Post subject: Reply with quote  Mark this post and the followings unread

Those PCBs look great. I'll be following your blog with interest.
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