PreenFM > preenfm2 and preenfm3

PreenFM2 new build, audio is mostly noise

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Glomerule:
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 !

served:
IF it works. Yes. You can leave them.
But Re-flow the DC jack. Volume potentsiometer and DAC. Also Output jacks are worth looking at.

Some tips for soldering.
1)Clean the tip regulary.
2) Heat the station to about 330to360 Degrees C (depending on your model)
3) Put the soldering-iron tip against the PCB and component leg and then apply some solder. First to a very little to the tip and then to the soldering area.
Keep adding the solder unitl the parts is soldered in.

Never solder with a tip that has a lot of solder on.
Apply most of the solder to the PCB and part leg, not to the soldering-iron-tip.

You anly need a very small amount of solder on the tip. It helps to transfer the heat. But its the only reason its there.

Glomerule:
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:
--- Quote from: lokki on May 18, 2021, 08:04:41 AM ---Does the noise disappear/diminish when you turn down the volume on the preenfm2

--- End quote ---

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...

lokki:
definitely redo the DC jack soldering... also redo the USB port soldering. (can't see it underneath the display)
DAC is certainly a good idea as well :-)

as you describe the issue (with the noise increasing when you touch a connected speaker) this sounds like a non existing/bad ground connection maybe..

Glomerule:
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.

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