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Quantix-8
MUFF WIGGLER Forum Index -> Music Tech DIY  
Author Quantix-8

ATOM

Considering to build this:



Quantix-8
I think I can manage the soldering more worried about calibration.
Have to learn how to use my oscilloscope to measure not just to see pretty waveforms.
Anybody built this?
question
ATOM


Luka

it has been on my maybe list for awhile
is there a mac editor yet?


ATOM

Not to worried about a mac editor.
I have a pc for audio my 27" Imac I use for Muff´ing lol

ATOM


mono-poly

ATOM wrote:
Not to worried about a mac editor.
I have a pc for audio my 27" Imac I use for Muff´ing lol

ATOM


Hahaha i am exactly the same.
New 27" imac in the living room and an old p4 in the studio.
I do got a bunch of Quantix-8 boards i need to build at some point.


neandrewthal

I've got 2 on the pile. The biggest hurdle for me is getting some interface for it.


Luka

is the only difference between this and miniwave the fact you have the option to make your own waves?


ATOM

It can be a 8bit sample player, pattern sequencer. midi to cv device.
Just placed a order.
thumbs up
ATOM


falafelbiels

So how nice is it to play with as a sample player? Hard to get enough proper samples in? I like my MPC for sequencing and such, but the sample/rhythm bit gets a bit long in the tooth and easily a bit straightforward compared to the modular sounds sometimes. I'd like to stick CV into the samples.
I have a CV/gate to midi thingy that I still need to stick to a frontpanel to midify my analog sequencers and drive the sampler, but for rhythm stuff the quantix seems real nice.

Any thoughts?


Funky40

I've finished 3 Modules, having a forth stuffed PCB sitting around.
None was wortking......... cry
on unit #1 it could have been only the midiconnections which caused the problems, i'm not shure.
Had to give space and power of the modular to other Modules, but i will go back to the quantix8 assoon i'm back into DIY ( i'm totally out of synth dIY and into RC glider DIY now )


Back then i had lots of mail exchange with Marc Bareille und was explaining him what a VCDO can do etc.
To his words, the quantix should be much more powerful.
to what came out of my unit #1 i'm in no doubt that the qunatix is something of the most interesting around.
I never heard a Miniwave, but i'm quite shure that thatone is not a comparison

with all the problems i had with my Q8s, i allready had the coolest waveshaper sounds ever within my synth.
There can come extremly cool sounds out of the q8, thats for shure.




quantix is NOT a simple story,
many factores involved,
in my opinion is not all clear regarding the build, (the switches/ i omitted some to make first tests easier)
but could be beacuse i'm not native english. but marc is not native english either.
I'd say it's nothing for beginners





the quantix is absolutely on top of my list,
i will check assoon my rack has power and i'm fit for it.
Hope to hear here from Guys who have built successfully.


e-grad

Funky40 wrote:
in my opinion is not all clear regarding the build

I have to almost fully populated PCBs yet stopped working on them bcs. of the modifactions necessary on the board. IIRC I didn't understand how to perform the modification back then. Hopefully I'll dig them out of my project box soon.


davebr

I just repaired a Quantix-8 for a fellow DIY-er (e.g. I don't own one). I found a few issues that I documented on my web page. I also found a couple of errors in the documentation that I sent back to Marc. Hopefully this information will help someone else bring theirs to life.

This is a pretty neat module - I was sorry to have to send it back! Having the PC software for creating new waveforms makes it very useful.

Dave


Hi5

I know Fonik has built one so hopefully he can chime in with some advice.


e-grad

The original Papareil documention does not seem to be online any longer. Hope every builder is aware of the "C18 bug correction"?

edit: @Dave, thanks for sharing!


fonik

Hi5 wrote:
I know Fonik has built one so hopefully he can chime in with some advice.

no, i need advice. lol it is simply not running (the ADC IIRC, maybe an issue with the clock speed!?).. i have had not the time to investigate in this, yet. so i will definately take a look at dave's site! great!


fonik

holy cow! i just took a quick look at your site, dave. and seems to be exactly the information i needed to make this module work! thank you very much for your efforts and sharing your work. appreciated! thumbs up


davebr

fonik wrote:
it is simply not running (the ADC IIRC, maybe an issue with the clock speed!?)


If you have a scope, adjust the level and bias until you get a nice 0 to 5 volt ramp on U12 pin 1. The output bits DB0 to DB7 should all be toggling uniformly, with each one being 2X the frequency of the next output. If the ramp frequency is 1 KHz, then DB7 should be 1KHz, DB6 should be 2 KHz, DB5 should be 4 KHz, etc. If you don't have a scope, then just plug them through a large value capacitor into your amplifier and listen to them. They will be +/- 2.5V signals. Start with a very low frequency ramp so the outputs won't be too high a frequency or you won't be able to hear them. They should be nice and pure (at least as pure as a square wave can be).

Another way is to simply tack another capacitor across C6 to increase the capacitance to lower the frequency. Running too slow shouldn't be much of a problem but too fast certainly can be. Good luck.


fonik

davebr wrote:
fonik wrote:
it is simply not running (the ADC IIRC, maybe an issue with the clock speed!?)


If you have a scope, adjust the level and bias until you get a nice 0 to 5 volt ramp on U12 pin 1. The output bits DB0 to DB7 should all be toggling uniformly, with each one being 2X the frequency of the next output. If the ramp frequency is 1 KHz, then DB7 should be 1KHz, DB6 should be 2 KHz, DB5 should be 4 KHz, etc.
<snip>
Running too slow shouldn't be much of a problem but too fast certainly can be.


thanks for this detailed description, dave. thank you so much.


ATOM

Thanks for the info.
My Quantix-8 is not working at the moment, I will have another go at this module.

ATOM


e-grad

BTW As of Jan 6th a software update for the Quantix 8 has been announced on Synth DIY list:
http://m.bareille.free.fr/modular1/quantix8/quantix8_soft.htm


fonik

thanks to mr brown the ADC is working now, and so the quantiy does - somehow. will have to calibrate it correctly (still some minor issues with the biasing), and then read the instruction and manual carfully!


fonik

hello dave,
i used the quantix as wavetable OSC and it is working in this mode now. thank you very much. i already played for about an hour modulating the wavetables thumbs up

just two short questions about your findings:

from your site:
Quote:
The Gate I/O jack is wired to J4 on the PCB, which connects to pin 24 of U15 (this is in error in V1.1A documentation but correct in V1.1B documentation). I added over/under voltage protection for the PIC with a 1K resistor in series to the jack and a diode to ground and a diode to +5 volts on pin 4 of U15. The PIC spec is +/- 0.3 volts so you might want to use schottky diodes for a low voltage drop.

The Zero Out jack is wired to J3 on the PCB which connects to pin 4 of U15 (this is in error in V1.1A documentation but correct in V1.1B documentation). Although this is an output, I also added the same over/under voltage protection for the PIC with a 1K resistor in series to the jack and a diode to ground and diode to +5 volts on pin 24 of U15. Again, you might want to use schottky diodes for a low voltage drop.

so those two connections are interchanged?

and the zero detect LED has to be reversed?

now that i look at this module again, i wished i had left off the first inverting opamp at the input, and added the bias control and the zero-detected-indicator-LED on the frontpanel (i fear i will have to do this), since they help you correcting the incoming signal. actually exact the same thing i did with the ADC input on my VCPS-8 sequencer meh


davebr

fonik wrote:
hello dave,
i used the quantix as wavetable OSC and it is working in this mode now. thank you very much. i already played for about an hour modulating the wavetables thumbs up

just two short questions about your findings:

from your site:
Quote:
The Gate I/O jack is wired to J4 on the PCB, which connects to pin 24 of U15 (this is in error in V1.1A documentation but correct in V1.1B documentation). I added over/under voltage protection for the PIC with a 1K resistor in series to the jack and a diode to ground and a diode to +5 volts on pin 4 of U15. The PIC spec is +/- 0.3 volts so you might want to use schottky diodes for a low voltage drop.

The Zero Out jack is wired to J3 on the PCB which connects to pin 4 of U15 (this is in error in V1.1A documentation but correct in V1.1B documentation). Although this is an output, I also added the same over/under voltage protection for the PIC with a 1K resistor in series to the jack and a diode to ground and diode to +5 volts on pin 24 of U15. Again, you might want to use schottky diodes for a low voltage drop.

so those two connections are interchanged?

and the zero detect LED has to be reversed?

now that i look at this module again, i wished i had left off the first inverting opamp at the input, and added the bias control and the zero-detected-indicator-LED on the frontpanel (i fear i will have to do this), since they help you correcting the incoming signal. actually exact the same thing i did with the ADC input on my VCPS-8 sequencer meh


Yes, and Yes. On the LED, it has to be reversed AND connected to +5V instead of ground. Marc updated the documention to V1.1B which now includes these corrections. - Dave

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