DIY MiniP7 Minipops7 clone *** Ext Trig and Audio Outs ***

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Boogie
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Post by Boogie » Fri Jul 20, 2018 12:50 am

Dr Gris
No more excuses, case is in and I'm gonna start soldering.
Nice to hear :yay:
Is the MiniP7 rippel sensitive?
well, that's a good question.
If you supply with plus and minus 15 V, there's an on board linear LDO to 12V with necessary filtering. In that case a 150 mV ripple won't be noticeable.

This is also the reason why most of my modules are designed to work with 15V so that one can do good local filtering and not see the 12V variations on the supply.

When applying plus and minus 12V, these LDO's are bypassed and thus reduced filtering. (both jumpers on the 12V location)
I have been running this directly from a Traco DCDC convertor with 75 mV ripple and didn't experience the noise being demodulated nor coming through.
Are both 12V/15V headers used? I guess so since I got 2 and there's places for them.
Yes, one is for the positive, the other is for the negative.
I need a "proper" output so I will enlarge the output for a 6,3mm jack
Should I go for insulated or not?
For this one (MiniP7), the 3.5mm Jacks are alo GND connected to the Front Panel.
As you will be using this as a stand alone, It's better to have the GND connected to the chasis, otherwise, the FP would be completely floating which is not a good thing.

Good luck ! :tu:
-------------------------------------------------------
“Digital generated ‘analog’, is missing its analog soul and therefore isn’t analog any more.”
Jupiter 8 clone: https://www.muffwiggler.com/forum/viewt ... p?t=209322
Minipops 7 clone: https://www.muffwiggler.com/forum/viewt ... p?t=199360
ClapTrap clone: https://www.muffwiggler.com/forum/viewt ... p?t=202248
www.nabla-instruments.com

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Boogie
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IMPORTANT CORRECTION

Post by Boogie » Fri Jul 20, 2018 5:40 am

Hello,

Unfortunately I've put a wrong picture in the manual.
For those who bought a unit, pls check your email (not PM).

Appologies for any inconvenience this may have caused.

Boogie.
-------------------------------------------------------
“Digital generated ‘analog’, is missing its analog soul and therefore isn’t analog any more.”
Jupiter 8 clone: https://www.muffwiggler.com/forum/viewt ... p?t=209322
Minipops 7 clone: https://www.muffwiggler.com/forum/viewt ... p?t=199360
ClapTrap clone: https://www.muffwiggler.com/forum/viewt ... p?t=202248
www.nabla-instruments.com

Dr Gris
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Post by Dr Gris » Wed Aug 01, 2018 3:18 pm

Had a quick test today, no calibration yet.
It sounds great even without calibration!!!
It took me longer to find my DIY stuff that was packed away in boxes then to solder.
Unfortunately the "out" printing on the panel had to go when I enlarged the output for 1/4".
That's because I had to enlarge the PCB as well so it aligned with the panel when sticking the much larger 1/4" plug in there.

Thanks again!!!

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Boogie
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Post by Boogie » Fri Aug 03, 2018 1:52 am

Great to see that the units are being assembled and functional as from the first time. :wow:
:chug: :chug: :chug: :chug: :chug: :chug: :chug: :chug: :chug: :chug: :chug: :chug: :chug: :chug: :chug:

For those with some MiniP7 assembly experience,
Pls feel free to publish some pictures, sounds etc...
Whatever you would be willing to share.
-------------------------------------------------------
“Digital generated ‘analog’, is missing its analog soul and therefore isn’t analog any more.”
Jupiter 8 clone: https://www.muffwiggler.com/forum/viewt ... p?t=209322
Minipops 7 clone: https://www.muffwiggler.com/forum/viewt ... p?t=199360
ClapTrap clone: https://www.muffwiggler.com/forum/viewt ... p?t=202248
www.nabla-instruments.com

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grenert
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Post by grenert » Sat Sep 01, 2018 1:48 pm

Just checking in to say I've completed my Minipops build, and it worked straight away! So much fun to listen to! I love fading the sounds in and out of a rhythm. The sounds are really distinctive, and I haven't even done any tuning yet. My only hiccups were:

1. Figuring out that not all of the panel screws were the same length.
2. On the back side, the nut needs to be used to add some space so that front and back screws can fit into the spacers.
3. I have zero Eurorack experience, so I did not know that I need to get a cable to go from the power connectors in my case to the PCB :doh: So right now it is powered by a bench supply outside of a case.

Edit to add: I am really impressed with how well the panel aligns with the hardware on the PCB. There is very little excess space around the switches, but no problems with rubbing against the panel. It is very professional.

Thank you for the super-cool project, Johan!

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Boogie
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Post by Boogie » Sun Sep 02, 2018 1:54 am

@grenert
thank you very much for the feedback.

About the screw length and nut on backside,
I must admid that I made amistake with the screw lengths and had to solve it with a nut. Unfortunately, this correction didn't make it into the assembly manual. Nevertheless, I'll still add that in the assembly manual.
Thank you for bringing it back to my attention.
Just checking in to say I've completed my Minipops build, and it worked straight away!

Well Done ! :yay:
So much fun to listen to! I love fading the sounds in and out of a rhythm. The sounds are really distinctive, and I haven't even done any tuning yet.
Very nice to hear this.
It's great no-one has had any 'big' problems with the assembly yet.
I am really impressed with how well the panel aligns with the hardware on the PCB. There is very little excess space around the switches, but no problems with rubbing against the panel. It is very professional.
Thank you. This is where my age plays a part as well as where the 3D combined design of PCB and mechanics come in.
Thank you for the super-cool project, Johan!
You're most welcome. :chug:
-------------------------------------------------------
“Digital generated ‘analog’, is missing its analog soul and therefore isn’t analog any more.”
Jupiter 8 clone: https://www.muffwiggler.com/forum/viewt ... p?t=209322
Minipops 7 clone: https://www.muffwiggler.com/forum/viewt ... p?t=199360
ClapTrap clone: https://www.muffwiggler.com/forum/viewt ... p?t=202248
www.nabla-instruments.com

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grenert
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Post by grenert » Thu Sep 20, 2018 11:57 pm

OK, she's all done! I tuned using an oscilloscope and got within 5% of all of the targeted frequencies. The only oddity was I could never reach 100 mV noise, and when I was at the max that I could get, it didn't sound right :despair:
So I just did the white noise by ear, and it was just fine.

A side point: I went with a Pittsburgh Cell 48 case. It works but I would _not_ recommend it for this or really anything else. The power supply it has is a bipolar, half-wave rectified, linear power supply. The input AC wall wart is 12 VAC. When using this in its stock form, there was audible noise that fluctuated with the LED blinking. I would say that a 12 VAC input is pretty marginal for a bipolar 12 V supply. Additionally, the filtering electrolytic caps after the rectification are rated for only 16 V. The no-load voltage of the wall wart is 14.5 VAC RMS, so peak of about 20 V. That's a recipe for early failure. :deadbanana: I replaced those with 25V rated caps. I also paralleled an extra diode to reduce the rectifier voltage drop and give the regulators a little more room to work with. Finally, I replaced the measly 1 uF output cap with a 47 uF one and a 0.1 uF ceramic. These changes fixed the noise problem and hopefully will prolong the life of the supply.

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Boogie
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Post by Boogie » Sat Sep 22, 2018 1:11 pm

Hello Grenert,

too bad you had this experience with the noise level trimming and enclosure.
I have to check for the noise level topic, and I'll come back to this.

Glad you got the ripple problem solved.
Though, neither Kreiff nor Dr Griss, both using the same enclosure, had a problem with the supply humming or being noisy.
The manufacturer may have put different supplies in the units they sold.

Anyhow,

I'm glad your new 'toy' is working fine.
-------------------------------------------------------
“Digital generated ‘analog’, is missing its analog soul and therefore isn’t analog any more.”
Jupiter 8 clone: https://www.muffwiggler.com/forum/viewt ... p?t=209322
Minipops 7 clone: https://www.muffwiggler.com/forum/viewt ... p?t=199360
ClapTrap clone: https://www.muffwiggler.com/forum/viewt ... p?t=202248
www.nabla-instruments.com

Dr Gris
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Post by Dr Gris » Sat Nov 10, 2018 7:59 am

So I have enjoyed my MiniP7 for some time but unfortunately I have a problem...

The problem occurs when I sync it to my external sequencer and not when it's internally clocked.
I get "a farting" sound on some of the triggers. I gets worse if I choose two patterns at the same time.
I've adjusted the voltages from my sequencer but it doesn't change anything.

I did experience this occasionally when I tried to tune it and it wasn't put together. I concluded that it had to do with the PCB moving a tiny bit when I handeled the tuning process since it wasn't fixed to a chassis...??

What am I doing wrong, any clues??

I really enjoy it and would love this sync to work.

Best//M

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Boogie
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Post by Boogie » Sat Nov 10, 2018 10:28 am

Hello Dr Gris
I'm sorry to hear this.

Several things are possible here:

- bad GND connection contact between the clk source and the MiniP7
- something touching the start stop signal at the jack
maybe a floating wire put in the start stop jack
- not a clean clock arriving at the MiniP7 but a clock with lot's of noise (GND-loop at the wrong spot) Can you connect the FP to the GND of the rest of your system ?

I haven't come across it before
can you intentionally repeat the error ?

any pictures available of the assembly ? and wire up you made ?

Let's solve this fast so you can keep on enjoying the thing.

brgds
Boogie
-------------------------------------------------------
“Digital generated ‘analog’, is missing its analog soul and therefore isn’t analog any more.”
Jupiter 8 clone: https://www.muffwiggler.com/forum/viewt ... p?t=209322
Minipops 7 clone: https://www.muffwiggler.com/forum/viewt ... p?t=199360
ClapTrap clone: https://www.muffwiggler.com/forum/viewt ... p?t=202248
www.nabla-instruments.com

Dr Gris
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Posts: 377
Joined: Tue Feb 14, 2017 5:14 pm
Location: Sweden

Post by Dr Gris » Sat Nov 10, 2018 12:46 pm

Thanks for your prompt reply.
I'll look into the specific areas you pointed me to.

Also thanks for your PM, I'll report back as soon as I have the time to look at this.

Cheers//M

Dr Gris
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Post by Dr Gris » Sat Dec 08, 2018 12:50 pm

Just want to report back that it's working as it should.
I've tried different ways to mount the front panel and for some reason when I use bolts that make the PCB sit a bit further from the front panel I don't have a problem.
This makes the push buttons sit a bit deeper from the front panel and the fastening screws to the sync and clock can't be mounted.
Don't know why this would influence the MiniP7, but for me it does.

Any way, I'm happy that it works and the clocking makes it a real fun to use.

Big thanks to Boogie!!! :hail:

//M

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Boogie
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Post by Boogie » Sat Dec 08, 2018 4:29 pm

Dr Gris
Big thanks to Boogie!!! :hail:
You're welcome :chug:
-------------------------------------------------------
“Digital generated ‘analog’, is missing its analog soul and therefore isn’t analog any more.”
Jupiter 8 clone: https://www.muffwiggler.com/forum/viewt ... p?t=209322
Minipops 7 clone: https://www.muffwiggler.com/forum/viewt ... p?t=199360
ClapTrap clone: https://www.muffwiggler.com/forum/viewt ... p?t=202248
www.nabla-instruments.com

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jam457
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Post by jam457 » Thu Dec 13, 2018 11:12 am

These are incredible!!! I guess I kind of missed out on these no? Any chance of doing another run of these kits?

anyways amazing work nonetheless!!
Dark Beep

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Boogie
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Post by Boogie » Thu Dec 13, 2018 11:35 am

jam457

Would there be more people who are still interested ?
I did get some email from other people already.

I can still assemble some kits.
-------------------------------------------------------
“Digital generated ‘analog’, is missing its analog soul and therefore isn’t analog any more.”
Jupiter 8 clone: https://www.muffwiggler.com/forum/viewt ... p?t=209322
Minipops 7 clone: https://www.muffwiggler.com/forum/viewt ... p?t=199360
ClapTrap clone: https://www.muffwiggler.com/forum/viewt ... p?t=202248
www.nabla-instruments.com

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jam457
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Joined: Sun Jun 16, 2013 9:37 pm
Location: Halifax, N.S.

Post by jam457 » Thu Dec 13, 2018 11:36 am

I imagine there may be some? How much are you selling the kits for? Maybe in the new year could do another shout out and see?
Dark Beep

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Boogie
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Post by Boogie » Thu Dec 13, 2018 11:56 am

jam457

Below price can be maintained
MiniP7_PCB SMD populated PCB
€ 233,05 ex VAT (or import taxes) and ex Transport

I have to recalculate the prices as the TH components have gone up in price.
Below price is indicative only
MiniP7_PCB_ext SMD populated PCB
Gold anodized Front Panel
Through Hole and mechanical components
with the exclusion of the tempo-knob but
inclusive 5 slider knobs
€ 364,15 ex VAT (or import taxes) and ex Transport and indicative only
-------------------------------------------------------
“Digital generated ‘analog’, is missing its analog soul and therefore isn’t analog any more.”
Jupiter 8 clone: https://www.muffwiggler.com/forum/viewt ... p?t=209322
Minipops 7 clone: https://www.muffwiggler.com/forum/viewt ... p?t=199360
ClapTrap clone: https://www.muffwiggler.com/forum/viewt ... p?t=202248
www.nabla-instruments.com

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Boogie
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Post by Boogie » Fri Apr 05, 2019 11:40 am

Hello all,

just to let you know that I will soon publish some info on how to trigger each of the instruments of the MiniP7.

I don't intend to provide a PCB, as the schematic is rather simple and can easily be built on a bread-board.
Wiring should not influence normal operation.

I've also had some requests to provide info on the audio outputs, but one has to know that adding wiring to the outputs will for sure introduce additional hum in the standard output.

Till soon.
Boogie
-------------------------------------------------------
“Digital generated ‘analog’, is missing its analog soul and therefore isn’t analog any more.”
Jupiter 8 clone: https://www.muffwiggler.com/forum/viewt ... p?t=209322
Minipops 7 clone: https://www.muffwiggler.com/forum/viewt ... p?t=199360
ClapTrap clone: https://www.muffwiggler.com/forum/viewt ... p?t=202248
www.nabla-instruments.com

Ayab
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Mini P7

Post by Ayab » Tue Apr 09, 2019 4:44 pm

Hi Johan

I would like to buy a Minip7 and regret that I could not do this before as I had other commitments. I am happy to see your project has been a success.

I hope you can add me to your list. Please feel free to pm me for payment details.

I am also very interested in your Jupiter 8 inspired polysynth but need to look at the thread a bit more.

Regards

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Boogie
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Post by Boogie » Wed Apr 10, 2019 8:37 am

Hello Ayab

nice to see you're back.

I've PM-ed you.

Boogie
-------------------------------------------------------
“Digital generated ‘analog’, is missing its analog soul and therefore isn’t analog any more.”
Jupiter 8 clone: https://www.muffwiggler.com/forum/viewt ... p?t=209322
Minipops 7 clone: https://www.muffwiggler.com/forum/viewt ... p?t=199360
ClapTrap clone: https://www.muffwiggler.com/forum/viewt ... p?t=202248
www.nabla-instruments.com

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Post by kreiff » Wed Apr 10, 2019 9:19 am

Boogie wrote: just to let you know that I will soon publish some info on how to trigger each of the instruments of the MiniP7.
Ooooh! Very cool! Looking forward to it!

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Boogie
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Post by Boogie » Wed Apr 10, 2019 12:39 pm

As promised,

the trigger connection points and trigger schematic.

Have fun :chug:

Image
Image
Image
You do not have the required permissions to view the files attached to this post.
-------------------------------------------------------
“Digital generated ‘analog’, is missing its analog soul and therefore isn’t analog any more.”
Jupiter 8 clone: https://www.muffwiggler.com/forum/viewt ... p?t=209322
Minipops 7 clone: https://www.muffwiggler.com/forum/viewt ... p?t=199360
ClapTrap clone: https://www.muffwiggler.com/forum/viewt ... p?t=202248
www.nabla-instruments.com

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grenert
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Post by grenert » Thu Apr 11, 2019 12:10 am

Thanks, Boogie! Guess I'll have to come up with my own rhythms now!

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Boogie
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Post by Boogie » Sun Apr 14, 2019 1:41 am

grenert
Guess I'll have to come up with my own rhythms now!
That's right, and might be a bigger chalenge then building electronics 8-)
-------------------------------------------------------
“Digital generated ‘analog’, is missing its analog soul and therefore isn’t analog any more.”
Jupiter 8 clone: https://www.muffwiggler.com/forum/viewt ... p?t=209322
Minipops 7 clone: https://www.muffwiggler.com/forum/viewt ... p?t=199360
ClapTrap clone: https://www.muffwiggler.com/forum/viewt ... p?t=202248
www.nabla-instruments.com

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Boogie
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Post by Boogie » Sun Apr 14, 2019 2:29 am

Individual instrument outputs

I'm providing this info since several requested it, though

It is strongly advised NOT TO implement this modif.

Main Risks
- damaging/breaking the resistor contact on PCB and/or resistor
- insertion of hum
- overall damaging beyond repair
- introducing shorts


Below are some instructions:
- use thin shielded wire for each signal
- DO NOT use unshielded wire
- find a GND connection as close as possible to the audio signal (white pads in 4th picture below)
- buffer each new output for signal balancing using the values as indicated in the schematic below
Image
Image
Image
Image
You do not have the required permissions to view the files attached to this post.
-------------------------------------------------------
“Digital generated ‘analog’, is missing its analog soul and therefore isn’t analog any more.”
Jupiter 8 clone: https://www.muffwiggler.com/forum/viewt ... p?t=209322
Minipops 7 clone: https://www.muffwiggler.com/forum/viewt ... p?t=199360
ClapTrap clone: https://www.muffwiggler.com/forum/viewt ... p?t=202248
www.nabla-instruments.com

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