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Post by keurslagerkurt on Nov 26, 2021 9:11:42 GMT
Hi all! Finally found time to play around with Grains, and experiencing some issues. First of all, there is a permanent, high pitched noise. It reminds me of USB noise and the like, however, the usb of grains is not plugged in at all. I tested with a fully unpatched rack, running the grains straight into the HP Amp to my headphones. Tried out different firmwares. The noise is always there.  The second problem makes the noise problem worse: the Grains output is very low for me. I tested with my ear next to FMOS, and the grains is almost inaudible. So I have to push my HP Amp 75% up before i can decently hear the Grains output. Which of course makes the noise worse as well. The firmwares seem to be working fine besides that however (tested Scheveningen from Ginko and Polyramp from Wonkystuff). When I try to look at the output on the Wonkystuff scope, I don't get any signal. I think it might be to weak of a signal? Seems like I'm just watching noise on the screen. Probably because the high pitched noise is about as loud as the actual output. Scope works fine for sure, tested with the FMOS and it displays it nicely. Don't know if this is a known issue? It makes the Grains kinda unuseable for me sadly  Hope someone can help, & cheers! Zeno / Kurt |
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namke
wonkystuff
electronics and sound, what's not to like?!
Posts: 654
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Post by namke on Nov 26, 2021 9:20:26 GMT
Strange! Is the M/G switch in the correct position? Depending on whether the firmware is for Mozzi or Grains this needs to be set correctly…
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Post by keurslagerkurt on Nov 26, 2021 9:21:50 GMT
Yes, it is in G position. In the Mozzi position I get no oscillator sound at all (as should be i think?). Interestingly: I still get the high pitched noise even when the switch is set to Mozzi.
Edit: I do get some bleed-through from the oscillator sound as well when the switch is set to Mozzi.
I'll get my interface and record it a little
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Post by keurslagerkurt on Nov 26, 2021 9:31:52 GMT
This is how it sounds on the Scheveningen firmware. soundcloud.com/zzzvm/grainsnoisedemo/s-vEhFLKBdoid?si=0906e4c0ebe74d48b054bcd0a2298e05You can hear that it clearly is louder, or at least as loud as the oscillator. At the end I set the switch to Mozzi. You can hear that the noise stays equally loud (but the oscillator is only faintly hearable now, but this is normal i think). Also, when I connect the USB, the noise is really unbearable, but I guess this is normal as well (and not really a problem). Hope this is some fixable issue, and not a broken unit. |
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Post by pt3r on Nov 26, 2021 10:01:18 GMT
That sounds like a broken module to me :-(. You did try to run it on its own without any other modules?
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Post by keurslagerkurt on Nov 26, 2021 10:35:38 GMT
That sounds like a broken module to me :-(. You did try to run it on its own without any other modules? Yeah, its running completely on its own. Or do you mean taking it out of the rack? Might be a way to test whether the noise comes from neighbouring modules, but I honestly don't think so. But might be worth ruling it out. Quickly put in my Arduino Nano in the breadboard and recreated the Grains (3 pots, simple RC filter out with 2.2k & 3.3 nF). Works perfectly and shows the Scheveningen complex oscillator nicely on the Meter module. (btw, love the meter module so much, saves me so much time getting out my scope & connecting it all). Wow this oscillator sounds GREAT by the way!  |
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Post by pt3r on Nov 26, 2021 10:39:48 GMT
wow that scheveningen firmware is something else. Very cool.
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namke
wonkystuff
electronics and sound, what's not to like?!
Posts: 654
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Post by namke on Nov 26, 2021 20:00:20 GMT
Thanks for the mention of the schevingen code — I’d missed that! Now ported to core1.æ too  |
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Post by pt3r on Nov 26, 2021 20:06:46 GMT
When is RBSS ported to core1.æ?  |
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pomal
New Member
Posts: 6 
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Post by pomal on Jan 13, 2022 21:04:50 GMT
Hello,
Since the beginning, I have the same problem on my grain module.
I am not a beginner with Arduino and I think I did all the obvious tests, but you never know?
Did you solve this problem and if so how?
Thanks in advance.
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Post by keurslagerkurt on Jan 14, 2022 7:52:20 GMT
Hello, Since the beginning, I have the same problem on my grain module. I am not a beginner with Arduino and I think I did all the obvious tests, but you never know? Did you solve this problem and if so how? Thanks in advance. Not yet, I think it's best to send robertlanger a mail ( tangiblewaves@gmail.com ). I will do it too, but still have to do it.. i don't like to complain, so I've been 'forgetting' to do it 😅 |
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pomal
New Member
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Post by pomal on Jan 14, 2022 15:08:48 GMT
Thank you for responding, and I understand, I don't like to complain too, but I like this module and I would love to take full advantage of it. |
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hgrwe
New Member
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Post by hgrwe on Jun 11, 2022 14:54:47 GMT
Hi, have you got your GRAINS to operation meanwhile?
I had also almost no output signal from the GRAINS.
I found that the feedback resistor of the buffer OpAmp R13 is missing on the board.
If I add e.g. 5kOhm there I get a strong output signal.
Does anybody know the correct value for R13? If I get it right from a foto it should be 2.2kOhm.
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pomal
New Member
Posts: 6
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Post by pomal on Jul 5, 2022 17:36:56 GMT
Hi, have you got your GRAINS to operation meanwhile?
I had also almost no output signal from the GRAINS.
I found that the feedback resistor of the buffer OpAmp R13 is missing on the board.
If I add e.g. 5kOhm there I get a strong output signal.
Does anybody know the correct value for R13? If I get it right from a foto it should be 2.2kOhm.
Hello, thanks for the info. I had stopped looking but I will try this tip soon. |
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namke
wonkystuff
electronics and sound, what's not to like?!
Posts: 654
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Post by namke on Jul 5, 2022 22:19:43 GMT
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Post by pt3r on Jul 6, 2022 6:34:45 GMT
Well well well, christmas will come early this year.
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Post by robertlanger on Jul 13, 2022 13:14:19 GMT
The correct value of R13 is 2.2k ohms.
It seems on some modules this resistor is missing and it also slipped through our testing procedure; so if you encounter any issues with the audio output (low level etc.) of your GRAINS please PM me for swapping it!
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