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Messages - Xavier

Pages: 1 ... 92 93 [94] 95 96 ... 149
1396
preenfm2 and preenfm3 / Re: New beta firmware 2.00 beta 1 (August 28th)
« on: September 28, 2015, 04:03:16 PM »
i dont think you lose real resolution its just the displays limitations
Not at the moment, but look at the quote in my previous post. I interpreted that to mean Xavier was considering changing the resolution to 0.1 above 10.

Yes no resolution lost, only display limitation.

What is possible is to change the encoder tick step (from 0.01 to 0.1) for value above 10 .
A=>F for value 10=>16 is also possible.
Not sure i'll implement any of both though ;)

I have to check custom characters, but they are very limited and i already use several of them.

1397
preenfm2 and preenfm3 / Re: On/Off Button - Pictures
« on: September 27, 2015, 07:15:37 PM »

Congrats, very nice  :D


1398
preenfm2 and preenfm3 / Re: Suggestion: Operator Solo function
« on: September 25, 2015, 06:25:24 PM »

That's a good idea.
It would be complicated to add that in the preenfm2 firmware.
But easy in the PC/Mac Editor.
Will think about that.


1399
preenfm2 and preenfm3 / Re: Manual
« on: September 23, 2015, 10:39:55 PM »
Hi Tenchi,

No sorry, there is no PDF manual to download and print.
You can try to find a chrome extension that turn any page into PDF.

Writing documention takes a lot of time. I don't think i'll ever write such a doc.
But if anyone wants to do it, that would be great  :)

Xavier

1400
preenfm2 and preenfm3 / Re: Encoder value jumping by 2 (new build)
« on: September 23, 2015, 09:18:49 AM »
Is this normal?  Perhaps there is a system setting that allows the indents to increase by 1 rather than 2?
Paul

Hi Paul,

Seems like you missed the very last line of the build instruction  ;)
http://ixox.fr/preenfm2/build-it/the-pcb-r5/
That redirect to the second entry of the FAQ :
http://ixox.fr/forum/index.php?topic=63377.0
which is :
Code: [Select]
If you need 2 ticks to increase by one the value or if one tick increases by 2 the values, you need to change the encoder drivers.
In the menu (Menu > tools > set > "Rot. enc.") you can chose between 2 encoder drivers: 12 and 24.

The PC/mac editor helps you to understand the underlying structure of the preenfm2.
And donc forget to read the manual (that i still need to update with 2.00 firmware features) :
http://ixox.fr/preenfm2/manual/synth-edit-mode/

Best


1401

Hi Windspirit and welcome,

PWM on the squarewave would add a HUGE CPU overhead. It's definitely not doable on the 192Mhz preenfm CPU which is already at 99% in heaviest scenario.
When using sin only, the number of possibility is already crazy when playing with complex FM algo.
Don't forget the randomize feature to discover new sound.

Xavier

1402
If the digital audio signals from the preenFM to the DACs are clean and if the analog audio signal path after the DAC is OK too. There should be sound  ;)
Unless your problem comes from the mixer/soundcard you use to hear the sound, but as you hear a "Pop" when switching on, it seems to be OK.

You're talking  about the clock signal. It's one of the 5 i colorized in audio_spi.png picture.
I'll try to post this week a screenshot of each of the color showing what you should have.


1403
I would go back to the first idea that the DACs do not receive correctly the SPI data from the preenF405.
Audio_SPI.png  picture in message #6.

Maybe if one of the signals green (Clock) or blue (sample data) does not reach the DAC, that could lead to not null but undetermined DAC output voltage.

Following the Audio_SPI.png picture, try to check and resolder all the concerned pins. DAC + preenF405.
Then see with your oscilloscope if the 5 color signals reach correctly on the DAC pins.
They're all fast signal.
The blue one is the fastest signal : several mhz.



1404

Do you have access to an oscilloscope ?

1405
Not easy...
I attached two pictures so that you can check any potential shorcut between junctions and all contuity.
I colorized the 5v in red, so as your audio path is higher than 2.5v i would first try to see if there is no 5V at some place where it shouldn't.

Then, check one by one every part of the circuit following the 2 pictures.


1406
And you turned up the volume pot right ?  ::)

1407
Seems like the DACs are receiving the signal from the preenF405 firmware when it's running.
But so i really don't understand why you don't hear sound while shortcuting directly to the audio jack while I suggested with the blue/green points above...  :-\

In any case you can double check the area circled in the attached picture.
These are all points used by the audio path. Don't hesitate to heat the points again and remove a little soldering.



1408
I meant : "Power it up WHILE pressing a button."

1409
Last test of the day :
Power it up by pressing a button.
Check on the display you are in bootloader mod.

Then check one more time the 2.5v. Still 0v ?

1410
The 2.5v on VCC is regulated internally on the DACs?

No, this is the zero of the preenF405 audio output signal. It sends 2048 on the 4096 DAC range.

So another test, put back the opamp, remove the preenF405 and test the 2.5v points. You should get 0v.

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