Messages

1

preenfm2 and preenfm3 / Re: PreenFM2 new build, audio is mostly noise

« on: May 20, 2021, 03:31:29 PM »

Ok, as Alice would say, it is getting 'curiouser and curiouser' but it might just be me being really bad at all this.

I tried to correct my bad soldering after watching a few how-to videos on youtube. It seems that the tip of my soldering iron is busted making the whole thing quite difficult. I couldn't manage to really de-solder / re-solder the DAC and other component but I think I managed to make it a bit better.

The infernal buzzing is still here but I can hear the FM synth a bit better and the buzzing does not increase when I turn up the volume knob !

I have a new problem though, The screen does not work anymore  :-\ ...

I used a multimeter to test continuity and everything seems fine (as far as I can tell) for all the components aside from some pin on the screen socket (picture below) being 'connected' (I took notes of which on a post-it that I of course lost immediately after), do you know if it might be why the screen stays black ?

Thanks for your input.

2

preenfm2 and preenfm3 / Re: PreenFM2 new build, audio is mostly noise

« on: May 18, 2021, 04:33:20 PM »

Great list of tips (haha) I will try all that as soon as I have the time.
I can't wait to make music but I have to say that even if I'm really bad at it (now but not forever I hope) I am discovering that I enjoy the process and having some guidance by people like you is really precious.

I am really grateful.

PS:

Does the noise disappear/diminish when you turn down the volume on the preenfm2

Hard to tell, it is really messy but when I listen the audio file I linked again, knowing that I am increasing the volume little by little, it seems that the notes get louder but the noise volume stays constant...

3

preenfm2 and preenfm3 / Re: PreenFM2 new build, audio is mostly noise

« on: May 18, 2021, 12:26:59 PM »

Haha, 'bad soldering' doesn't even begin to describe it !

I will redo the whole soldering of the DAC as you advise after watching a few video tutorial...

For the rest I might redo them later anyway but since the screen and all the encoders seem to be working fine, don't you think I can leave them like that for the time being ?
Thank you for your help !

4

preenfm2 and preenfm3 / Re: PreenFM2 new build, audio is mostly noise

« on: May 18, 2021, 09:45:35 AM »

Thank you fellas !

here are front and back shots:




I couldn't remove the screen this morning but I'll do it if you think it matters.

Another clue might be this:
When I plug it for power, be it usb or DC, if I use my little Bose speaker that has a metal case, there is a strong noise appearing whenever I touch the metal... I don't have that if plugging in my mixer.
 It seems relevant but what do I know !

Thanks again.
 

5

preenfm2 and preenfm3 / PreenFM2 new build, audio is mostly noise

« on: May 17, 2021, 04:45:06 PM »

Hello fellow PreenFM enthusiasts,

I'll start by saying that I am more than impress the whole initiative and that this really is the kind of project the world needs more of (in every domain).

Biggest shout-out to Xavier.

So here is my story.
A few weeks ago, I saw a mention of the PreenFM2 on reddit r/synthesizer and was intrigued. One or two youtube videos later I was hooked and ready for a sleep deprivation fueled impulse buy. 
The Vandaal website was all out of assembled PreenFM2 R6 so I went to the second link, TubeOhm and bought what I thought was an already assembled synth.

Spoiler alert: it was not.

Yesterday I decided to give it a go. I have no soldering skills (a few jacks and midi cables is all that I have soldered before that, and not even very well...).
It almost went smoothly and the most complex thing ended up being the software part as I thought it was pre-flashed when in fact it was not.

Anyway, cutting short, I have a fully assembled PreenFM2 with the latest firmware (not the latest bootloader though, I did not find a version above the 1.11) that responds to midi (the channel number is blinking on note input).

The sound it produces though is not what it should be for sure.
It is constantly there even without input note. It is mostly noise with the FM patch behind. It reacts to preset loading or algorithm change etc but there is this constant noise that I cannot shake off.

There is no instruction on how to install the DAC on the new R6 but the very clear picture on the PCB makes it quite obvious so I think I did it the right way.

Sound example: https://www.dropbox.com/s/23efcyzytpwjm8h/postassembly_noise.mp3?dl=0

I have no idea where it comes from and I'd be really much obliged if someone from the community could help me a bit.

I can post photos or other sounds or even videos if needed of course.

Thank you for your help!