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Messages - Xavier

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PreenFM2 / Re: Crashed Unit, weird message on 2.07
« on: February 10, 2017, 12:24:19 AM »
This is a actually a crash.
If i were at home i could see where it crashes from those pointers.
I'll take a look when back in 10 days.
Let me now if it's 100% reproducible.


PreenFM2 / Re: Custom Initial Preset
« on: February 10, 2017, 12:21:22 AM »
Yes please share your bank here when it's ready  :)

PreenFM2 / Re: Custom Initial Preset
« on: February 09, 2017, 12:01:10 AM »
You can overide dedault preset by going through the menu. Save>default>save.
Just create your empty patch before.

PreenFM2 / Re: Yellow OLED : high frequency solution
« on: February 01, 2017, 10:06:57 AM »
Just a quick question on the aluminum shield mod:  Do you just stuff the bag between the OLED screen and the PCB?  Do you secure it all?  Is it okay if the bag is touching the board?

As far as only plastic touch the board it's totally OK.

PreenFM2 / Re: Metal case wanted
« on: January 29, 2017, 02:20:48 PM »
Hello, I would pay good money for a PreenFM2 metal case. Van Daal electronics is out of stock and I am getting impatient because the instrument is not very portable without a case. :)
Does anyone have a spare?


Hi Matt,

I don't have news from Van Daal Electronics. Metal cases were supposed to be available in January.
(Keep in mind you'll need an OLED display).

The Plexy case works fine and makes the preenfm2 much more portable  ;)

PreenFM2 / Re: LCD display not working
« on: January 29, 2017, 02:19:03 PM »
And now it works :)
Thanks guys for the quick help   :-*

Nice ! Thanks for the update  :)
Don't forget you can adjust the LCD contrast with the variable resistor...

And what does P3 analog input (require dedicated firmware) mean?
If you compile the branch adcIn from github.
You'll get 4 additional analog entries in the modulation matrix. !!!! 0-3.3v or you'll break your preenF405 !!!!
No support from me on this firmware.
If someone come up with a clean op amp schema to plug some external analog hardware here, i'm interested  ;)

PreenFM2 / Re: LCD display not working
« on: January 26, 2017, 01:33:11 PM »
Yes it needs to be wire.

If you have a PCB revision R5d, you’ll have an additional resistor named Oled on the right of the above picture .
Populate it with a 22 ohm if you have an OLED display or shortcut it with a resistor pin if you have a LCD display.

Let us know when it's working :)


You only need to solder headers on JMP1 and JMP2.

JMP3 if you need to flash the bootloader one day.  bootloader is different from firmware.
You'll likelyt never need it.
You don't need it at all to upgrade firmware.

You don't solder/unsolder the pins. You just put or remove the jumber on it.

The others P1, P3 are for specific purpose..
. P1 allows you to plug a st-link v2 debugger.
. P3 analog input  (require dedicated firmware).


In French / Re: Son strident désagréable
« on: January 22, 2017, 08:32:35 PM »
Excellente nouvelle  :)
Merci pour l'update.

PreenFM2 / Re: why fm and not pm
« on: January 22, 2017, 10:23:15 AM »
There's a good explanation here :

In the preenfm2 ALGO5 here is how the low pass filter is simply implemented :
Only usefull where 3 or more operators in cascade.
The low pass filter gets rid of the DC offset and so gets rid of the pitch shifting in the following operator.

PreenFM2 / Re: seems to work, but no display
« on: January 19, 2017, 09:46:16 AM »

Sorry for being late here.

You bought your kit from Van Dall Electornics : I think they ship only OLED so i assume you have a yellow OLED display.
Please confirm...

Reminder :

I found a 68k resistor (purloined from my Jasper BOM) and put it in there.  Same behavior.

I assume you meant 68 and not 68k. I don't know where you saw 68k.
This 68 ohm resistor is for the LCD display  Anyway it cannot hurt with an OLED it's just not used.

Another thing I didn't mention, is that the kit I got came with the shield mod - a steel plate with some additional spacers.  It also came with a red wire, which the build instructions didn't address.  Am I supposed do do something with that wire?

This kit is provided by Van Daal Electronics, contact them for more info.
But this seems to be for the OPTIONAL mod.

UPDATE - Found the instructions for the wire.  "You have to cut the pin 2 of the OLED header then link pins 2 and 15... See the red wire on the picture above and the missing pin between the OLED and the preenfm PCB. I remove the whole pin but simply cutting it on the OLED side will work."
Doesn't help with the display.  :(  I don't want to have to order another kit or give up and buy an assembled one. 

This is an optional mod. Cannot fix anything if it didn't work before.
But NOW (if you cut 2 and linked pins 2 and 15) you must fill the 68 ohms which is redirected to the display power pin.
A 68 ohm will work (not a 68k), but a 22 ohm is better (brighter display).

I would check shortcuts between adjacent pins in the attached pictures.


PreenFM2 / Re: seems to work, but no display
« on: January 16, 2017, 09:57:13 AM »
Yes, there's some confusion with the PCB revision.

The 68 ohm resistor (beside the 10k) is a resistor for the LCD led powering. So it's not used at all with the OLED displays.

The revision "5c" of the PCB does not have the "OLED" resistor. It will work fine. But the OLED hight pitch modification  is a bit more complicated to make with this revision.
Your OLED display should work fine, there's nothing special to do.
Please, post clear pictures of all the display solder points so that we can take a look.

PreenFM2 / Re: [Feature Request] Adjustable Seq/Arp Length
« on: January 10, 2017, 08:36:36 PM »
Seems like i never answered to the orinal request.
I cannot say anything else that it's a good idea  :)

Requires some time to spec and to insert properly in the existing screens.

In French / Re: Son strident désagréable
« on: January 07, 2017, 11:45:07 PM »
Merci pour les photos. Tout a l'air plutot propre.

Le son de ton enregistrement est vraiment bruité, c'est le son direct du preenfm2 ?

Les ultasons dont tu parles sont aussi présent lorsque ton preenfm2 ne joue rien ?
As tu regardé cette page ?
Dans ton cas, tu vas au step 4 directement.

J'ai regardé ton mp3 et il y a un pic a 15Khz.
La majorité des gens (dont je fais partie) ne l'entendent pas.
Essaye de faire le petit montage a base de papier aluminium comme expliqué dans le post.

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