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Papareil
Joined: Mar 23, 2005
Posts: 21
Location: France
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 Posted: Sat May 31, 2008 5:51 pm Post subject:
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| Quote: | | so is it about 100 dollars for the set? |
If you count the $1.50 for €1 it is around $78 for one set 'all included' !
So hurry up to order before the $ sink more !!! 
With the actual economy the probability it cost you $100 per set in few monthes is far to be null 
Cheers,
Marc B.
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mono-poly
Joined: Jul 07, 2004
Posts: 937
Location: Rotterdam, Netherlands
Audio files: 2
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| Posted: Sun Jun 01, 2008 7:00 am Post subject:
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| I am really gonna get a few off these in the future. |
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loss1234
Joined: Jul 24, 2007
Posts: 1536
Location: nyc
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etaoin
Joined: Jun 30, 2005
Posts: 761
Location: Utrecht, NL
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| Posted: Tue Jun 24, 2008 12:57 am Post subject:
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So, am I the only one apart from Marc that has a working Quantix then?
Anyway, does anyone know an IC that will do five and six bit binary to dual bcd 7-segment display? I like the display in my CGS Wavetable and would really like to use some here as well.
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Last edited by etaoin on Tue Jun 24, 2008 12:46 pm; edited 1 time in total |
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factus10
Joined: Jun 20, 2007
Posts: 158
Location: Buffalo, NY
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| Posted: Tue Jun 24, 2008 12:45 pm Post subject:
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I have the PCB and PIC and plan to build mine in the next month or so.
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Sebo
Joined: Apr 27, 2007
Posts: 564
Location: Argentina
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| Posted: Wed Jun 25, 2008 12:27 pm Post subject:
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Hi:
My Quantix-8 set arrived today.
I'm don't think I could start working in it for some time, but I will start
collecting the parts. Right now I can find the RAM in any of the local
electronic stores. I will check online.
Also the REF01 is very hard to find, and when shows up is very expensive.
I know because I build MIDI to CV from Marc's site before and ended
replacing the REF01 for a little circuit around a TL431. It worked OK, so
I think I will be the same with the Quantix-8.
The ADC is listed as ADC820 I found it as ADC0820, I think is the same,
right?
Finally what better than a TL072 FET opamp could I use, something like
a NE5532 or something like a CA3140/OPA2134?
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mono-poly
Joined: Jul 07, 2004
Posts: 937
Location: Rotterdam, Netherlands
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| Posted: Wed Jun 25, 2008 12:31 pm Post subject:
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I am ordening 4 off them  |
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etaoin
Joined: Jun 30, 2005
Posts: 761
Location: Utrecht, NL
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| Posted: Wed Jun 25, 2008 12:36 pm Post subject:
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I got the RAM from Futurlec. I also had trouble getting the REF01 (only one local source and a very expensive one at that), so I ended up ordering the AD581 together with the RAM. Reasonable enough at current exchange rates. And as Futurlec also sold both the ADC and DAC, I was finished with one order.
From your opamp list I'd choose the OPA2134. The NE5532 draws much more current. The CA3140 doesn't seem a replacement to me. LF442 might be an option as well. Not sure expensive opamps would matter much here though.
ADC0820 is the right one.
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mono-poly
Joined: Jul 07, 2004
Posts: 937
Location: Rotterdam, Netherlands
Audio files: 2
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| Posted: Wed Jun 25, 2008 1:21 pm Post subject:
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| Etaoin, Did you got my message on SF ? |
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Sebo
Joined: Apr 27, 2007
Posts: 564
Location: Argentina
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| Posted: Thu Jun 26, 2008 8:27 am Post subject:
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Etaoin:
Thanks, I'll check Futurlec.
Marc:
I tried to send you mails confirming the set arrival, but your e-mail server
is returning them to me.
I will try again.
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Sebo
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Papareil
Joined: Mar 23, 2005
Posts: 21
Location: France
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Posted: Thu Jun 26, 2008 5:51 pm Post subject:
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Hi ,
| Quote: | | Finally what better than a TL072 FET opamp could I use, something likea NE5532 or something like a CA3140/OPA2134? |
Forget CA3140 , it is single opamp , not pin to pin compatible with dual ones like the TL072...The NE5532/OPA2134 are a good choice at least for audio applications...There are certainly many others , but here is a list of those who come to my mind, not in preference order :
- OPA2604
- OPA2277
- OPA2627
- AD825
- OP275
good and cheap old ones :
- LM358 (dual 741)
- 4558
[Sebo] I have noticed that your board is well arrived
Thanks,
Marc B.
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Luka
Joined: Jun 29, 2007
Posts: 1003
Location: Melb.
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Papareil
Joined: Mar 23, 2005
Posts: 21
Location: France
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| Posted: Mon Nov 24, 2008 1:05 pm Post subject:
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| Quote: |
how is the Mac editor going? |
Not very well 
The guys who was supposed to do the job has given up... I guess he was more talkative than really skilled to do that ...
So i am looking for a SERIOUS MAC coder, motivated to 'carry' the PC source to the Mac ... Any volunteers in the place ? 
I also seriouly plan to build a little remote control box for the Quantix-8 and my MCVs interfaces to set parameters with an LCD and a set of push buttons/pots... No more need of PC MIDI editors this way, at least to set main parameters. It will be a very cheal and small device . Don't dream , i do not plan to edit the Quantix-8 wavetable on an LCD screen anyway !
Else i am actualy writing the PC editor online help files/pages... and brainstorming new features to add
Marc B.
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Sebo
Joined: Apr 27, 2007
Posts: 564
Location: Argentina
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| Posted: Thu Feb 12, 2009 4:45 pm Post subject:
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Hi:
I finally started to build the Quantix-8.
I have some question:
1)
| Quote: | U19A is a unity gain inverter ... as most VCOs on the market provide down saw waveform
instead of upsaw , you may want to bypass U19A (= bad idea) or to add a switch to choose
direct or inverted input... |
I can't find an easy way to do this with only a switch, I think I have to switch
from direct to inverted input but change the configuration of the opamp too.
Am I right?
I find easier adding another opamp in an inverter configuration and bypass
it with the switch.
2) Sorry for this one, but I have to ask again wich opamp to use that is better
than a TL072.
I will use the Quantix-8 mostly as a Wavetable,
and in a less degree as a sample player and quantizer.
So, low offset is not too important (I think), but good sound is.
I can't find most of the opamp from the list Marc post.
At the moment my options are:
LF442
4558
CA3240 (I was referring to this in my previous post, but I mistyped 3140)
NE5532 (I will try to avoid this because the current consumption).
I know I could try to find wich one sound better by myself, but most of this
opamps are expensive (especially where I live), and are from different
stores, so any advice will be very helpful.
Thank you.
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Papareil
Joined: Mar 23, 2005
Posts: 21
Location: France
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| Posted: Fri Feb 13, 2009 7:53 am Post subject:
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Hi Seb
| Quote: | | I can't find an easy way to do this with only a switch, I think I have to switch from direct to inverted input but change the configuration of the opamp too. Am I right? |
It change the input impedance when switched on the inverted stage U19B ( z=10k...) But you can replace R54 and R57 by 100k resistors and adapt the feedback resistors to get the rigth gain R55 = 100k and R56 = 100k trimmer for example .It will be some good values to start with.. This way you will have still the same gain and get a 100k impedance
| Quote: | | I find easier adding another opamp in an inverter configuration and bypass it with the switch. |
It is another possible solution ...
On my system , i have modified a pair of VCOs, down-saw outputs, that i always use to drive the Quantix-8 to play wavetables :added a calibrated inverted opamp on the saw output with an additional op-amp on a tiny pcb... and now they are up-saw outputs
A third solution is to forget the inverted switch , and to not modify the VCOs output , but to think to reverse all waveforms systematicaly before to send them to the Quantix-8 .. The editor software can do that instantly! 
| Quote: | | Sorry for this one, but I have to ask again wich opamp to use that is better than a TL072. |
Well my 0.1 cent advise : use a good 8 pins socket for U16 opamp and try !
The NE5532 sound good, the LM358 was one of my first choise but it sound less 'fat ' compared to the TL072...I have not tried the 4558,LF442
but they can be sonicaly interesting. To get a musical result a very good or accurate opamp is probably not the best here... A cheap one - not very linear - will probably give a more interesting sound because there is no antialias filter on the DAC output , so it is the poor perfs of the op-amp who 'compensate' ...
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Sebo
Joined: Apr 27, 2007
Posts: 564
Location: Argentina
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| Posted: Sat Feb 14, 2009 11:40 am Post subject:
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I will change R54, R55 and R57 by 100K, I will keep R56 as 10K trim by now,
I don't think will need it, as I will use a 100K trimer as input attenuator (my
systems works with 10Vpp, -5V to +5V).
Also will try some opamps for U16, starting with the ones I have handy.
Thank you.
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Sebo
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thermionicjunky
Joined: Dec 07, 2006
Posts: 90
Location: san francisco
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| Posted: Sun Feb 15, 2009 8:25 pm Post subject:
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| Hello, just another request for a MAC editor. |
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Sebo
Joined: Apr 27, 2007
Posts: 564
Location: Argentina
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| Posted: Thu Feb 19, 2009 7:43 pm Post subject:
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Hi:
I just finished the Quantix-8, it is working, I managed to solve most of the
issues I had, except one or two.
I want to detail the mods I did and the solved problems I had.
First I uploaded a Bank and downloaded it without problems, then tried to
do the same with a full wavetable, but here is my first big problem, for
some reason the banks don't change when upload/download the wavetable,
so it uploads all banks to the same bank in the Quantix, and downloads
only the current bank again and again when trying to download the
wavetable.
The Banks change OK from the frontpanel and from CV. I think could be
something with the configuration, as I haven´t had much time to learn to
use the software editor yet. Anybody can help me here?
I installed the battery and checked if the RAM retains the data, all OK here.
One note here, I used a compatible RAM that the guy at a local store sold
me, it is working right, I don't have the Quantix here, but I will post wich
RAM is, in case somebody wants to know.
Then I calibrated the output as 1V/Oct, I didn't have any problem here
except that the output is inverted!!! 0V is at highest note and 10V at the
lowest.
I don't think this is normal, but I don´t care much about it by now, in any
case I will invert the scales.
Next I Checked the clock of the ADC (I used the ADC0820, and installed
the 1K trim), it was really high so I turn the trim all the way up, but the
clock still a little bit over 600KHz, at this point the ADC wasn't working.
I changed the trimm for a 1K6 resistor without luck, so I changed it for
a 2K resistor and the ADC started to work, but very erraticaly, the
waveform lost bits, and the RAM got corrupted (when I downloaded the
bank I saw the same missing bits as in the oscilloscope). I started to think
the problem was the RAM, but finally changed the resistor for a 2K7 one
and all started to work correctly.
The clock is running at 417KHz aprox (I used the grid of the oscilloscope to
calculate the frequency), is this frequency too low? I could try a 2k2 resistor,
but since it is working now I want to keep it that way.
Next I calibrated the input, I did the mod to switch between non inverted
and inverted input (as mencioned in previous post), at this point I can't get
both modes to work well calibrated, when one is OK the other clips a little,
I used the trim in the feedback of U19B to compensate but wasn't enough.
I choose to get well calibrated the inverted input to use with my VCOs, and
let the non-inverted input clipping a bit.
It is all by now, I'm happy with my Quantix-8, just want to find some time to
start playing with it.
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Sebo
Joined: Apr 27, 2007
Posts: 564
Location: Argentina
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| Posted: Fri Feb 20, 2009 1:53 pm Post subject:
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I forgot to mention that I had to set the Sysex Send Delay to 24 to get the
banks uploaded without corruption.
I dind't try to low it after I set the ADC clock correctly. Will try soon.
The RAM is a BS62LV4006PIP55
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lexvortex
Joined: May 14, 2008
Posts: 155
Location: Toronto
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| Posted: Sun Mar 01, 2009 2:58 pm Post subject:
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| Quote: | I also seriouly plan to build a little remote control box for the Quantix-8 and my MCVs interfaces to set parameters with an LCD and a set of push buttons/pots... No more need of PC MIDI editors this way, at least to set main parameters. It will be a very cheal and small device . Don't dream , i do not plan to edit the Quantix-8 wavetable on an LCD screen anyway !
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Hi Marc,
Any progress on this? I have two of them and it would be very handy to have such a box.
Thanks,
Dave |
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Sebo
Joined: Apr 27, 2007
Posts: 564
Location: Argentina
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| Posted: Thu Apr 09, 2009 4:07 pm Post subject:
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Hi:
Here are some pictures of my finished Quantix-8.
Are there any news about the issues I posted before?
None of them are taking my sleep away, and the module are working good apart
from that, but I want to get it to work as it should.
Thank you Marc for this great project.
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Sebo
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mono-poly
Joined: Jul 07, 2004
Posts: 937
Location: Rotterdam, Netherlands
Audio files: 2
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| Posted: Sun Apr 12, 2009 4:01 am Post subject:
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| Nice looking module! |
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funkyfarm
Joined: Jan 21, 2007
Posts: 583
Location: France
Audio files: 3
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| Posted: Thu Jun 04, 2009 8:19 am Post subject:
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| Hi Sebo, so in the end, what's behind your INV switch ? |
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Sebo
Joined: Apr 27, 2007
Posts: 564
Location: Argentina
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| Posted: Sat Jun 27, 2009 2:47 pm Post subject:
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| funkyfarm wrote: | | Hi Sebo, so in the end, what's behind your INV switch ? |
Hi:
Sorry to take so long to respond, but for some reason I didn't get a notification in my mail.
I ended doing what Marc said, I changed R54, R55, and R57 by 100K, but
kept R56 Trim at 10K (I didn't need much gain as my modular works at 10 Vpp).
I pulled a the leg of R54 connected at the out of U19A, and inserted wires there, going to a double inverter switch.
In one position the out of U19A is connected to R54 (non inverted input) in the
other position the input is connected directly to R54 (inverted input).
Hope I explained it well (sometimes my english is hard to understand).
Also I'm using it a bit more, and I love this module. I love to use it as a waveshaper.
I did a track using it as a distortion waveshaper, and the texture I get is amazing.
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Sebo
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blue hell
Site Admin
Joined: Apr 03, 2004
Posts: 24432
Location: The Netherlands, Enschede
Audio files: 297
G2 patch files: 320
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| Posted: Sat Jun 27, 2009 5:36 pm Post subject:
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| Sebo wrote: | | but for some reason I didn't get a notification in my mail. |
The email notifications are not always reliable unfortunately  sorry for that.
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Jan
also .. could someone please turn down the thermostat a bit.
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