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PreenFM Eurorack module

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served:
Hello,

I am starting this thread to give more information about the PreenFM Eurorack implementation.

We have now finished the case design.

Beta panel looked like this but had some mounting issues etc. So we had to make a change.



Current and the latest revision.




Unit has total of 5 different PCBs. So its a bit complex build but it can be DIY kitted and assembled with good instructions.





CV1 is routed to GATE and it triggers a note.
Gate input is limited to 3V pulse. So it is only capable to trigger something like Gate but also it can be mapped to the matrix.

CV2 is routed to V/Oct input. It is designed to get 0V to 10V input. 1V is one octave. PreenFM is using only 8 octaves on that input.
CV3 and CV4 are similar -5V to +5V.

All the inputs are buffered and voltage protected. meaning that they can take anything coming from Eurorack system.

CV1-4 inputs can be mapped to matrix parameters.
Options:

None;
Gate;
IM1; IM2; IM3; IM4; IM*
Mix1; Pan1; Mix2; Pan2; Mix3; Pan3; Mix4; Pan4; Mix*; Pan*;
o1Fq; o2Fq; o3Fq; o4Fq; o5Fq; o6Fq; o*Fq; o*Fh
Att1; Att2; Att3; Att4; Att5; Att6; AttC; AttM;
DecC; DecM; RelC; RelM
mx01; mx02; mx03; mx04
l1Fq; l2Fq; l3Fq;
e2si; s1ga; s2ga;
Fltr

PSU section.
Takes a normal Eurorack +/-12V power and +5V. There is an onboard 5V regulator if your eurorack system doesnt have a 5V rail.
You can choose to use that regulator by connecting a jumper to "Reg." position. Or to "Bus" if you have a 5V bus.


On the Audio outputs there is an option to use a stereo cable by having a jumper installed to RIGHT-LEFT link pins.
Then Stereo output is LEFT channel out.

USB power has 5V supply cut to escape various powering issues.

31HP in width.
Total 400mA current draw, using +5V; +12V; -12V; bus.

V/Octave calibration process:
Menu > Tools > Set > to adjust v/oct (first 3 encoders change the parameter, last 4th encoder changes the value)
You need to adjust CV A(33) (midi note 33) and adjust CV A(81) (midi note 81).
This will scale the V/Oct with out the need to adjust each octave one by one.
Example values are: CV A(33) 256 and CV A(81) 735. Each unit has its own values and depend on your voltage generator settings.

I will post some videos in the near future how it performs.

We will start to produce the modules assembled this month.
They will become available here: http://vandaal-electronics.com/product/preenfm-eurorack-module/


Any feedback is welcome and will help with the developement!

benjaminr:
Very excited about this! Built mine in a panel with the CV inputs, but they're not hooked up to anything yet. I need to learn more about voltage scaling first lol. I will definitely watch the videos and read any docs you have when there available! Keep up the good work!

served:
Tested the PreenFm with Doepfer A-105 filter and it plays really well.
So Preen audio output should be enough for most of the Eurorack modules.

served:
On request by Matthis I have made a post into ModularGrid database.
PreenFM Module can be found at www.modulargrid.net/e/other-unknown-preenfm

This is just a demo-post to test how it acts. I will fill in the correct information in near future!

Measured Current Draw on each rail.

-12VDC 10mA
+12VDC 20mA
+5VDC 250mA

served:
First video uploaded.

https://youtu.be/Lq88y8aF-hE

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