Messages

1381

preenfm2 and preenfm3 / Re: New firmware 2.01 (October 10th)

« on: October 13, 2015, 06:18:59 PM »

I didn't know those waveforms. They seem to be all 600 samples.

Seems like we need a firmware 2.02 that would accept any number of samples in the waveform text files.

1382

preenfm2 and preenfm3 / Re: New firmware 2.01 (October 10th)

« on: October 13, 2015, 10:00:04 AM »

Yes, i described the format in the first message of this thread as well as in the newly updated doc - "2. Operator / Shape" :
http://ixox.fr/preenfm2/manual/synth-edit-mode/

600 is not a power of 2
As the preenfm2 does not interpolate between sample i suggest to use 1024 samples if possible for better sound quality.

If a non power of 2 is found, a '#' overwrite the first caracter of your name and the sample is not loaded.


Xavier

1383

preenfm2 and preenfm3 / Re: PreenFM2 More Waveforms Like the Ableton Live Operator?

« on: October 11, 2015, 09:05:22 AM »

I also like the idea of loading waveform from the USB.
The problem is preset compatibility between preenFM.
But that can be fun.

I try to make a new feature with each new Kits batch.
This one could be for next run 

Done in firmware 2.01. 

1384

preenfm2 and preenfm3 / Re: New firmware 2.01 (October 10th)

« on: October 10, 2015, 11:15:14 PM »

Firmware 2.01 uploaded 
See first message of this thread for more information.

Here are 2 examples that you have to copy on the preenfm2 USB drive in /pfm2/waveform/

Enjoy and don't hesitate to share your waveform and how you like it to be modulated.

Xavier

1385

preenfm2 and preenfm3 / Re: My first preenFM2 metal case built from kit #1 of 3 .. trouble shooting no audio

« on: October 08, 2015, 10:00:42 AM »

Horridus, your new PCB is on it way.
Served is right, in the meantime if you can send me back your faulty preenfm2, i'd love to take a look.

Thanks,

Xavier

1386

preenfm2 and preenfm3 / Re: My first preenFM2 metal case built from kit #1 of 3 .. trouble shooting no audio

« on: October 05, 2015, 11:46:42 PM »

One last question, have you tried to power it with a real 9V wall power supply ?

1387

preenfm2 and preenfm3 / Re: My first preenFM2 metal case built from kit #1 of 3 .. trouble shooting no audio

« on: October 05, 2015, 11:44:15 PM »

Congrats...
You're the winner of the contest : the unfixable preenfm2 
Your prize : a new PCB and its components.

Send me an email to preenfm1@gmail.com and let me know if you already have some of the IC sockets, resistors, capacitors, diode in your stock...

Time to go to bed for me

1388

preenfm2 and preenfm3 / Re: My first preenFM2 metal case built from kit #1 of 3 .. trouble shooting no audio

« on: October 05, 2015, 11:15:13 PM »

OK So there is actually a sound. That's not a no audio problem 

Forget what i said about the 115K resistors.
Can you double check the resistor values 1.8K and 115K ?

1389

preenfm2 and preenfm3 / Re: My first preenFM2 metal case built from kit #1 of 3 .. trouble shooting no audio

« on: October 05, 2015, 09:22:53 AM »

Everything looks good. Digital sample data reach the DACs.
This is the Biggest mistery in the whole preenfm2 history   

You can use your oscilloscope to follow the audio path.
Clear the default Combo preset (MENU>SAVE>Default>clear). REBOOT. so that we know you have a "sounding" preset.
Set the voice number to 1 for the current instrument and 0 to the others to maximize the voltage output of the preset.
Play a repeating note from you sequencer, loop it,  and be sure the instrument show up on the display.

Now put your oscilloscope on the output of the DAC.
Bottom left pin on the gerber1.png
http://ixox.fr/forum/index.php?topic=63509.msg65620#msg65620

If you see your analog waveform, Then try to continue the audio path. 1.8K => 3.3nF => 8.2k => opamp => 68 => 22uF => pot.

If the output is FLAT at the direct output of the DAC, try to unsolder the 1.8K resistor and try again the DAC output.

1390

preenfm2 and preenfm3 / Re: My first preenFM2 metal case built from kit #1 of 3 .. trouble shooting no audio

« on: October 04, 2015, 11:12:59 PM »

The last 2 pics you sent, which pins are they representative of?

The file name of the screenshot is the color you see on the SPI schema.

Xavier

1391

preenfm2 and preenfm3 / Re: My first preenFM2 metal case built from kit #1 of 3 .. trouble shooting no audio

« on: October 04, 2015, 04:41:21 PM »

And the 2 last...

1392

preenfm2 and preenfm3 / Re: My first preenFM2 metal case built from kit #1 of 3 .. trouble shooting no audio

« on: October 04, 2015, 04:40:51 PM »

Here are the expected signals measured directly on the pins of the MCP4922 while the preenfm2 is turn on without any sound.

Colors correspond to Audio_SPI.png:
http://ixox.fr/forum/index.php?topic=63509.msg65602#msg65602

1393

preenfm2 and preenfm3 / Re: My first preenFM2 metal case built from kit #1 of 3 .. trouble shooting no audio

« on: October 04, 2015, 10:12:19 AM »

Sorry, didn't have time to post SPI oscilloscope screenshots.
But if you post yours i can tell you if they are good.

You removed the DAC sockets  Ouch. Impressive...

The 115K resistors (with the 1.8K ones) are only to add the 2 DACs output : with a 64 times ratio (115/1.8 = 64).
I don't think they can be responsible for the bad voltage.

Didn't you try to build the other preenfm2 you have ?

1394

preenfm2 and preenfm3 / Re: Suggestion: Operator Solo function

« on: October 03, 2015, 02:55:38 PM »

Just realize this:
The faster way to turn off an operator is to change is shape (waveform) to "Off".
Then turn the encoder back to set again the original waveform.

1395

preenfm2 and preenfm3 / Re: New beta firmware 2.00 beta 1 (August 28th)

« on: September 29, 2015, 11:48:26 AM »

I might be misunderstanding, but if the tick was changed to 0.1 over values of 10 how would we get a modulation amount of say 10.04? It seems to me that we would be limited to multiples of 0.1, this is what I mean by loss of resolution. At the moment we can at least count the ticks to get values like 10.04. Apologies if I'm just misunderstanding.

Right... 10.04 would be impossible from the preenfm2 itself.
But do you really hear a difference between 10, 10.04 and 10.1 ?

Anyway for the moment i won't change anything