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21
preenfm2 and preenfm3 / Preenfm3 DIY build - kit from Van Daal Electronics
« Last post by jaradical on November 06, 2021, 12:32:36 PM »
G'day All,

Last night I made some time to build the preenfm3 kit I bought from Van Daal Electronics.
It was a successful build, the guide was detailed and easy to follow and everything worked first time.

Here are some pictures of the build if you are interested:

https://imgur.com/a/wayEzOS

I wanted to say thanks to Xavier and Ardi for putting all of this together and releasing it as they do. 
I'm looking forward to getting to know the synth and learning more about FM synthesis.

Cheers
22
Yes, the early ones were not flashed  :)
I now flash them because i found a quick method to do so and helping people who cannot flash can be tricky.

Excellent !! Hope you didnt mind me mentioning it :-)
(I do think it’s an amazing synth - thanks Xavier)
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preenfm2 and preenfm3 / Re: PreenFM3 Headphone Output and power consumption question
« Last post by lokki on November 05, 2021, 12:46:07 AM »
With 12v you will generate a lot of extra heat, which could be a problem without a heatsink...I am not even sure passive cooling will be enough at 12v
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preenfm2 and preenfm3 / Re: PreenFM3 Headphone Output and power consumption question
« Last post by isoa on November 04, 2021, 03:58:38 PM »
Thanks for that Xavier, that was all perfectly explained.

I've just ordered a stepdown converter for providing 5V to the ESP as you suggested. After all it is the safest option. One last question, the DCIN barrel input, it must be 9V straight? Is it possible to feed a different voltage and let the 7805 do the 5V conversion? I don't have 9V power supplies but i do have a lot of 12V ones.

Once my unit is fully finished i will post a video and pictures in the forum : )

Isoa
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preenfm2 and preenfm3 / Re: PreenFM3 Headphone Output and power consumption question
« Last post by Xavier on November 03, 2021, 10:29:19 PM »
Hi isoa,

- First : The aux output is a copy of the 1-2 output.
A simple op amp follower is wired to allow to add an aditional output without altering the main 1-2 output level.
The level is not very high so it's not ideal for headset. But if it works for you, that's fine.
Yes, you should be able to add a potentiometer to turn down the volume.
The idea was to put an headset amplifer there but finding one that works from GND/5V is not easy.

- Pfm3 consumption is  between 220ma and 280ma depending of your TFT.
The 9v->5v converter is done with 2 diodes + 7805.
So if you draw 500mA more from the 7805 it will get too hot.
In addition, Usb2 specification allow it to give 500mA of current.

A solution would be to use the 9V DcIn and to use a separate 9v->5v converter for your ESP8266+Led.
If you take the power from the DcIn Jumper, the current already went through a diode so it should be at 8V.
That can be a solution for you?
26
Just one datapoint - my pcb wasn’t flashed either by the way. Not a problem at all as I absolutely didnt expect it to be and wasnt aware you *were* flashing them.... :-)
Unless the flashing is a recent thing (I think mine was a very early one).....

Yes, the early ones were not flashed  :)
I now flash them because i found a quick method to do so and helping people who cannot flash can be tricky.
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preenfm2 and preenfm3 / PreenFM3 Headphone Output and power consumption question
« Last post by isoa on November 03, 2021, 06:05:45 PM »
First hello everyone as i recently made a PFM3 here : ) I'm still getting in touch with the new unit but as i'm finishing the enclosure design i have some questions:

-First: Headphone output. The info in the github is a bit weak. I did what Xavier said (bridge 12 to Aux . both jumpers, bridge VCC Aux, and connect AUX 1.2.G to my 3.5mm jack output) I do have headphone output and the quality with a 32 Ohm drivers is reasonable. What i would want to know is why Xavier specifies it would be better to connect a headphone amp rather than the direct headphones? It's because quality and power output restrictions? I would also want to know if its feasible to solder a stereo potentiometer to 1.2.G Aux outputs to be able to control the volume.

-Second: About the power consumption. I want to install inside the case an ESP8266 Wifi board with WLED software that would be able to power up lets say around 12 leds of WS28212b programable diodes. A nice colour touch to the milky white acrylic base i'm thinking. Will the RF wifi transmission of the ESP8266 affect the sound quality of the synth? And also, what is the power consumption of the PFM3? Where can i safely tap a 5V/GND line to power the ESP+LEDS setup? I'm powering my unit from the USB port, but i would likely tap this 5V source from anywhere in the board that feeds 5V independently if i power via USB or 9VDC barrel adaptor. The ESP8266+Led array should draw around 400-500ma so i don't know if i'm overdoing with this idea.

Thanks for this nice project. Happy user here :)
28
Just one datapoint - my pcb wasn’t flashed either by the way. Not a problem at all as I absolutely didnt expect it to be and wasnt aware you *were* flashing them.... :-)
Unless the flashing is a recent thing (I think mine was a very early one).....
29
New firmware v0.109 available
https://github.com/Ixox/preenfm3/releases

New PCB version supported

The new main pfm3 PCB (labeled "1.6 - 100" / availability november 2021) uses a different version of STM32H743 and have a few changes.
With these new PCBs, the knobs and butons won't respond with earlier firmware.
This firmware 1.09 and the next ones check the PCB version and can work with all PCB versions.

Sequencer midi control

New midi control change allow the following actions :
(106 is a general action. Others will act on the instrument corresponding to the midi channe used.)

CC 106 : Starts/Stops the sequencer. Value 0 stops, value >=1 starts.
CC 107 : Mute instrument. Value 0 mutes, value >=1 unmute.
CC 108 : Record instrument. Value 0 disable recording, value >=1 enable recording.
CC 109 : Change the current step sequence number played by the instrument.
CC 110 : allow transposition : 64 = no transposition. Transposition will be (value - 64) semitones. Transposition is only available through midi CC110. No equivalent in the UI.

The 3 filter params are now all available in the matrix destination

Thanks to Patrice Vigouroux (Toltekradiation) for this implementation
At the end of the matrix destination list there are now :

Filt1 : allow modulation of the first filter parameter
Filt2 : allow modulation of the second filter parameter
FiltAm : allow modulation of the filter Gain

Smoother reverb dry/wet param

Thanks to Patrice Vigouroux (Toltekradiation) for this modification
Turning up the Reverb dry/wet value now has a slower reverb curve.

Faster firmware

The default compiler option is now -Ofast instead of -O3 which gives a 5% faster firmware.
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preenfm2 and preenfm3 / Re: add matrix destinations
« Last post by Xavier on October 30, 2021, 12:53:25 PM »

Thanks  :)
I'll try to make the 0.109 pfm3 firmware available this week end.
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