Mini-Modules : Minimoog DIY clone on its way.

From circuitbending to homebrew stompboxes & synths, keep the DIY spirit alive!

Moderators: Kent, Joe., luketeaford, lisa

Post Reply
User avatar
LED-man
Super Deluxe Wiggler
Posts: 1500
Joined: Wed Aug 08, 2012 1:48 pm
Location: Wolfsburg Germany

Post by LED-man » Tue Jun 26, 2018 6:40 am

aabbcc wrote:Is anyone else providing the rare parts kit now since www.diysynth.de closed down :despair:
Julien have my rare parts kits, please ask him
################################
TTSH Support Page and other DIY Projects:
https://www.DSL-man.de

User avatar
Kevin Mitchell
Wiggling with Experience
Posts: 297
Joined: Tue Jun 27, 2017 10:55 am
Location: Springfield, Massachusetts

Post by Kevin Mitchell » Tue Jun 26, 2018 8:52 am

Wanted to post an update on my project since I've got it all sorted out (kind of)

First off, I didn't quite understand how modualtion worked with VCO3 and neglect to set it to LO for the most usable modulation wave.

Besides that issue, I was having trouble elsewhere and not realizing it. With decay on - when I release a key (usually the higher notes) it would drop about a semitone unless glide was turned up. I had a couple of BF245A jfets for the glide circuit instead of BF245B so I went ahead and replaced them with BF245B just to find that I had bought fake ones on ebay
:doh:

I had replaced those with a couple 2n5457 jfets and for the most part it had improved though the highest octave of my 5 octave keyboard seems to still do it.

I guess I'll see what other jfets I can throw in there. I've measured my 1 volt per octave controller and that seems okay. I'll go back and check the glide circuit again when I find the time.

aabbcc
Wiggling with Experience
Posts: 313
Joined: Fri Feb 02, 2018 10:47 am
Location: Sweden

Post by aabbcc » Tue Jun 26, 2018 9:04 am

LED-man wrote:
aabbcc wrote:Is anyone else providing the rare parts kit now since www.diysynth.de closed down :despair:
Julien have my rare parts kits, please ask him
Thanks! Noticed on his website its included when you buy the euro kit :)

A more burning issue though, does anyone know any cheaper replacement for the 642-5636A and 642-5646A, togheter those add up to 75 EUR inc vat at mouser, madness...

User avatar
Kevin Mitchell
Wiggling with Experience
Posts: 297
Joined: Tue Jun 27, 2017 10:55 am
Location: Springfield, Massachusetts

Post by Kevin Mitchell » Tue Jun 26, 2018 9:50 am

aabbcc wrote: A more burning issue though, does anyone know any cheaper replacement for the 642-5636A and 642-5646A, togheter those add up to 75 EUR inc vat at mouser, madness...
I had used the standard PCB mount toggle switches. I'm not familiar with foreign vendors but BLMS has great prices for switches here in the US.
Kevin Mitchell wrote:My kit came in the mail today. Couldn't help myself 8-)
Image

The BLMS toggles fit perfect. $0.74USD each
DPDT
SPDT.

TheSlowGrowth
Common Wiggler
Posts: 158
Joined: Tue Apr 05, 2016 11:44 am

Post by TheSlowGrowth » Wed Jun 27, 2018 3:16 am

aabbcc wrote:Is anyone else providing the rare parts kit now since www.diysynth.de closed down :despair:
I still have three LS3954 from my buy at micross. PM me if interested (shipping from Europe)

aabbcc
Wiggling with Experience
Posts: 313
Joined: Fri Feb 02, 2018 10:47 am
Location: Sweden

Post by aabbcc » Wed Jun 27, 2018 4:25 am

TheSlowGrowth wrote:
aabbcc wrote:Is anyone else providing the rare parts kit now since www.diysynth.de closed down :despair:
I still have three LS3954 from my buy at micross. PM me if interested (shipping from Europe)
PM'd

Mogli
Learning to Wiggle
Posts: 2
Joined: Tue Jul 17, 2018 10:09 am

No sound :(

Post by Mogli » Tue Jul 17, 2018 10:21 am

Hi there,

i finished the Minimoog Clone a few days ago but the synth doesn't do a single sound. I thought the soldering was quite ok. maybe i missed sth essential as it was my first diy build.
i checked the voltage on the testpoints as described on the guin guin page, and everything is right (didnt tune so far though). I connected a CV but nothing happens..
All ICs, except for IC24 are soldered pretty well. Also the Transistors are based.
Does sb have an idea?

Kind Regards,
Hans

warpmachine
Learning to Wiggle
Posts: 2
Joined: Tue Jul 17, 2018 2:49 pm
Location: vienna

Post by warpmachine » Tue Jul 17, 2018 3:05 pm

hi all,
i finished my build yesterday and everything seems to work quite well but there is nothing coming from VCO 1 and 3. Only VCO 2 is working.
I checked JP11 JP12 and JP13 but only JP12 gives me waveforms.
I checked all the voltage check points and everything is in order.

the weird thing is that I can hear it popping when I change the waveforms of VCO 1 and 3 but no actual sound. And when I use OSC3 in LFO Mode to modulate the filter it seems to affect it for one second or so and then it stops.

what can I do?

warpmachine
Learning to Wiggle
Posts: 2
Joined: Tue Jul 17, 2018 2:49 pm
Location: vienna

Post by warpmachine » Wed Jul 18, 2018 10:10 am

figured it out. it was a bad soldering joint i think.
everything is working now.
thanks for this great machine Julian!

User avatar
Kevin Mitchell
Wiggling with Experience
Posts: 297
Joined: Tue Jun 27, 2017 10:55 am
Location: Springfield, Massachusetts

Re: No sound :(

Post by Kevin Mitchell » Fri Jul 20, 2018 3:24 pm

Mogli wrote:Hi there,

i finished the Minimoog Clone a few days ago but the synth doesn't do a single sound. I thought the soldering was quite ok. maybe i missed sth essential as it was my first diy build.
i checked the voltage on the testpoints as described on the guin guin page, and everything is right (didnt tune so far though). I connected a CV but nothing happens..
All ICs, except for IC24 are soldered pretty well. Also the Transistors are based.
Does sb have an idea?

Kind Regards,
Hans
You need to raise the gate high to get anything out of it. You said CV is connected but what about gate? Just a thought. Took me a while to wrap my head around the unit but CV and gate are things you must know about for analog synths.

You might be insane if this is your first DIY project. The chances of making a mistake are extremely high. And finding those mistake are going to be a massive pain.

Mogli
Learning to Wiggle
Posts: 2
Joined: Tue Jul 17, 2018 10:09 am

Re: No sound :(

Post by Mogli » Sat Jul 21, 2018 5:34 am

Kevin Mitchell wrote:
Mogli wrote:Hi there,

i finished the Minimoog Clone a few days ago but the synth doesn't do a single sound. I thought the soldering was quite ok. maybe i missed sth essential as it was my first diy build.
i checked the voltage on the testpoints as described on the guin guin page, and everything is right (didnt tune so far though). I connected a CV but nothing happens..
All ICs, except for IC24 are soldered pretty well. Also the Transistors are based.
Does sb have an idea?

Kind Regards,
Hans
You need to raise the gate high to get anything out of it. You said CV is connected but what about gate? Just a thought. Took me a while to wrap my head around the unit but CV and gate are things you must know about for analog synths.

You might be insane if this is your first DIY project. The chances of making a mistake are extremely high. And finding those mistake are going to be a massive pain.
I also connected a Gate, sorry for not writing that.
Also i have the Waveform Sounds on the Molex Connectors, i resoldered all Board to Board Connectors. Still no Sound..

kobinn
Learning to Wiggle
Posts: 5
Joined: Tue Jul 25, 2017 10:02 am

Not getting any sound from the main output or oscillator one

Post by kobinn » Thu Aug 09, 2018 12:54 pm

Hi!

Can't seem to get any output from the jack... I get all +10, -10, etc voltages and resoldered over and over again, so i don't know what im getting wrong...

Oscillators work perfectly checking the molex connectors!

Any chance I can get the schematics so it'll be easier to debug this?

User avatar
Kevin Mitchell
Wiggling with Experience
Posts: 297
Joined: Tue Jun 27, 2017 10:55 am
Location: Springfield, Massachusetts

Post by Kevin Mitchell » Thu Aug 23, 2018 9:11 am

Any updates for the expansion panels? I check in a few times a week for any progress.

Hope all is well!
-KM

User avatar
aethyr
Wiggling with Experience
Posts: 400
Joined: Fri May 23, 2014 5:45 pm
Location: Over the edges

Post by aethyr » Wed Sep 05, 2018 11:03 am

I need help repairing a MME. Anyone have enough experience with these that feels comfortable fixing it?

PM me.

User avatar
jdelgoulet
Wiggling with Experience
Posts: 270
Joined: Tue Jun 05, 2012 4:12 am
Location: Brive , France

Post by jdelgoulet » Thu Sep 06, 2018 4:00 am

aethyr wrote:I need help repairing a MME. Anyone have enough experience with these that feels comfortable fixing it?

PM me.
You've got a message.
Julien

User avatar
Kevin Mitchell
Wiggling with Experience
Posts: 297
Joined: Tue Jun 27, 2017 10:55 am
Location: Springfield, Massachusetts

Post by Kevin Mitchell » Thu Sep 06, 2018 8:56 am

The Model D itch continues... Looks like I'm going big next time around
Image

User avatar
fuzzbass
Super Deluxe Wiggler
Posts: 2089
Joined: Thu Feb 06, 2014 6:08 pm
Location: Florida, USA

Post by fuzzbass » Sat Sep 29, 2018 12:49 pm

Questions:
1. What are the purpose of JP1, JP11-13?
2. Is there a schematic published?

Thank you.

Found it!
JP10 : you must put a jumper (so that both pins are connected)
JP11 - JP12 - JP13 are not use yet : leave them like that. Those will be used for an up coming extension that will allow to access all 3 VCOs output waveforms at the same time (plus a sine wave generated for all 3), allowing you to patch the VCO like if they were single eurorack modules.
JP1 is not used yet : same as JP11, JP12, JP13 but for noise.
Wired for weird

User avatar
Swyndger
Common Wiggler
Posts: 71
Joined: Wed May 10, 2017 12:17 pm
Location: Germany

Post by Swyndger » Sun Nov 04, 2018 7:51 am

I have finished my MME months ago, but had no time to check and calibrate it. Now days are getting shorter and I put the MME back into modular.
Almost everything seems to work as it shound, except of the modulation.

VCO3 works fine in the audio way, even on low you can here it clicking :)
But when I switch VCO Mod on, the tune of VCO1 just gets deeper, and if I turn the MOD-Level up, the tone even gets deeper. If I switch VCF-Mod on, the filter closes (cutoff gets lower).
Mod-Mix seems to do nothing.

EDIT: Started calibrating the MME.
Everything if fine, except Step 5.
On TP10 I have no signal from VCO3. Instead there is a permanent -9,3V DC!
BTW: I can calibrate the offset on TP11 to ZERO

So before I start to make things worser, maybe someone has a hint, where I can start looking for errors. (Soldering seems to be ok ...)

By the way ... even it's not calibrated, the MME sounds great ...

User avatar
jdelgoulet
Wiggling with Experience
Posts: 270
Joined: Tue Jun 05, 2012 4:12 am
Location: Brive , France

Post by jdelgoulet » Mon Nov 05, 2018 10:23 am

If you set the MOD-MIX knob to "N" (left position), what do you have on TP-10 ?

TP-10 is the output of the modulation mix circuitry and should output either Noise/ Osc3 or a mix of both.
You can :
- check the orientation of Q92 , Q93 and Q91
- Make sure that Q92 and Q93 are matched.
- Make sure that you did not mix Q92/Q93 and Q91 (Q92 and Q93 are 2N3392 and Q91 is 2N4058).
- Check soldering of :
- Q91
- Q92
- Q93
- R337
- R338
- R342
- R339
- R340
- R335
- R336
- R341
Last edited by jdelgoulet on Thu Nov 08, 2018 10:02 am, edited 1 time in total.

User avatar
Swyndger
Common Wiggler
Posts: 71
Joined: Wed May 10, 2017 12:17 pm
Location: Germany

Post by Swyndger » Mon Nov 05, 2018 3:30 pm

Thank you, Julien, thank you very much!

There was a realy tiny - but visible! - solderjoint between one leg of Q91 and the resistor above (R339) ... now it's gone and modulation works fine. YES!

Still have to calibrate the last stepp ... when I switch OSC-MOD on and have MOD-LEVEL turned down, pitch goes one halftone up. But that will be done tomorrow. Now I am happy to have a wonderfull working little MME.

Cablebasher
Wiggling with Experience
Posts: 407
Joined: Sat Aug 03, 2013 6:51 am
Location: England, UK.

Post by Cablebasher » Tue Nov 13, 2018 5:36 am

Hey guys

Been following this thread since the start and have decided to take the plunge.

2 questions:

What do people think is the total cost of parts (excluding power and case)?

And

Is there an Approved mouser cart?

I have been through the thread and can’t seem to find one.

Looks like a pretty simple build as the pcb looks really nicely laid out.

My biggest issue (like most people) will be the SMD parts.

Thanks as always.

User avatar
jdelgoulet
Wiggling with Experience
Posts: 270
Joined: Tue Jun 05, 2012 4:12 am
Location: Brive , France

Post by jdelgoulet » Tue Nov 13, 2018 8:22 am

Unfortunately there is no Mouser Cart. The main reason is that components, in order to get a cheaper MME, should be ordered from multiple places.
Concerning the SMD soldering I would say that if you are meticulous this won't be hard : the more 'complicated' being the LM3046.

User avatar
Kipling
Ultra Wiggler
Posts: 978
Joined: Tue Dec 10, 2013 3:31 pm
Location: South-East England

Post by Kipling » Tue Nov 13, 2018 8:28 am

As with many projects there is no single supplier that stocks all the components required. Some are quite rare and you have to search around to find them from wherever you can.

User avatar
fuzzbass
Super Deluxe Wiggler
Posts: 2089
Joined: Thu Feb 06, 2014 6:08 pm
Location: Florida, USA

Post by fuzzbass » Wed Nov 14, 2018 10:29 am

Cablebasher wrote:Hey guys

Been following this thread since the start and have decided to take the plunge.

2 questions:

What do people think is the total cost of parts (excluding power and case)?

And

Is there an Approved mouser cart?

I have been through the thread and can’t seem to find one.

Looks like a pretty simple build as the pcb looks really nicely laid out.

My biggest issue (like most people) will be the SMD parts.

Thanks as always.
Synthcube is getting ready to bring out a full kit offering. This is one of the more complicated BOMs to fulfill (aftermarket parts, rotary pots are 6mm round, but rotary switches are spline shaft, so ideally same knobs but different shafts - they can be had, from two different sources, lots of matched pairs, etc). If you don't want to manage the procurement, just wait for Synthcube's kit.

I have built one so far. And, while the analog board is dense, I found the boards and the BOM to be bug-free and the panels I received are pristine.

As a DIY offering, MME is one of the most well thought out and presented that I have seen. My only beef with Guinguin's BOM is that I would prefer that footprints be shown for active devices. I thought I had CA3046s for this until I had the boards in hand and found the required CA3046 are SOIC14(!). Also there are TL1963 LDOs in two different SMD footprints - one can easily overlook this.

The one thing to consider here: the schematics are not released, so debugging may be a bit more of a challenge than other projects. But the designer participates here, so you can certainly get good quality help.

If you don't already have one, I recommend building a transistor matching rig, as discussed in other recent threads. There are a bunch of matches needed here.
Wired for weird

Cablebasher
Wiggling with Experience
Posts: 407
Joined: Sat Aug 03, 2013 6:51 am
Location: England, UK.

Post by Cablebasher » Wed Nov 14, 2018 10:52 am

thanks for the info guys

I will wait for the synthcube kits

I really hate sourcing parts!

From the pictures the PCB looks very straight forward and the build guide is very good

Look forward to building this as I haven't soldered any modules for months!

Post Reply

Return to “Music Tech DIY”