Messages

1171

preenfm2 and preenfm3 / Re: preenFM is going to Eurorack

« on: February 13, 2017, 12:03:42 AM »

I'm away from my computer still for 8 days.
Have a look at this post :
http://ixox.fr/forum/index.php?topic=69235.msg72051#msg72051

1172

preenfm2 and preenfm3 / Re: Acrylic case online

« on: February 10, 2017, 05:26:22 PM »

A clean version is available on github :
https://github.com/Ixox/preenfm2/tree/master/hardware/case

1173

preenfm2 and preenfm3 / Re: PreenFM2 will not turn on

« on: February 10, 2017, 12:42:02 AM »

Thanks pauto for helping. 
Jmp1 and jmp2 definetely need to be closed.  Or no current powers the preen.

1174

preenfm2 and preenfm3 / 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.

Thanks

1175

preenfm2 and preenfm3 / Re: Custom Initial Preset

« on: February 10, 2017, 12:21:22 AM »

Yes please share your bank here when it's ready 

1176

preenfm2 and preenfm3 / Re: Custom Initial Preset

« on: February 09, 2017, 12:01:10 AM »

Hi,
You can overide dedault preset by going through the menu. Save>default>save.
Just create your empty patch before.

1177

preenfm2 and preenfm3 / 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.

1178

preenfm2 and preenfm3 / 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?

Thanks,
Matt

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 

1179

preenfm2 and preenfm3 / 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...
 

1180

preenfm2 and preenfm3 / Re: Build Question - 20 pin header connections (only given 8 in my Van Daal kit)

« on: January 29, 2017, 02:16:24 PM »

And what does P3 analog input (require dedicated firmware) mean?

https://github.com/Ixox/preenfm2/tree/adcIn
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 

1181

preenfm2 and preenfm3 / 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

1182

preenfm2 and preenfm3 / Re: Build Question - 20 pin header connections (only given 8 in my Van Daal kit)

« on: January 26, 2017, 01:29:52 PM »

Hi,

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.
http://ixox.fr/preenfm2/manual/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).

Xavier

1183

preenfm2 and preenfm3 / Re: why fm and not pm

« on: January 22, 2017, 10:23:15 AM »

There's a good explanation here :
http://www.musicdsp.org/showone.php?id=160

In the preenfm2 ALGO5 here is how the low pass filter is simply implemented :
https://github.com/Ixox/preenfm2/blob/master/src/synth/Voice.cpp#L677
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.

1184

preenfm2 and preenfm3 / Re: seems to work, but no display

« on: January 19, 2017, 09:46:16 AM »

Hi,

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 :
http://ixox.fr/preenfm2/build-it/thebuild/

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.


Xavier

1185

preenfm2 and preenfm3 / 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.