No audio output from Daisy Patch SM (MCU working fine)

[ygjk]

Hello everyone,

I’m having an issue with my Daisy Patch SM — the board powers up and the red LED on the Daisy Patch SM turns on normally.
I can upload and run sketches through the Arduino IDE without any problem, but I get no audio signal at the outputs (B1/B2), even when testing with a simple 440 Hz sine wave.

Here are some details:

• The board is powered from an Eurorack ±12 V supply (A5 = +12 V, A1 = −12 V, A4/A7 = GND).

• Audio connections: OUT L = B2, OUT R = B1.

• The module is recognized by the computer and successfully flashes code, but there’s still complete silence on the outputs.

I’m a total beginner but i was able to make some effects works (but not potentiometers), but since an hour or so, impossible to ear anything anymore.

Could you please advise on further checks or repair options?

Thank you for your help

[ygjk]

No answer so I continue to looking for my problem and I found this topic on the forum :

CV didn't work on Patch SM

Hello! I have a patch submodule PCB. I have tried flashing it to check the LED blinking and it works great. My problem comes with the CV inputs. They don’t seem to work. I have tried examples from the web programmer (Pot input) and the LED always stays on. I have repeatedly checked all connections, tried 5V from another power supply… Nothing seems to make it work. The audio output works well, in other examples the output outputs a correct oscillator signal, but I find myself unable to change t…

This is exactly the problem I have since the beginning, CVs are not working and I checked again and again my wiring.

I do Eurorack modules with Arduino nano since long time now and I’m used to work on electronic components.

I took this Patch SM to make my life simpler but clearly, it doesn’t work.

No CVs (potentiometers) working and now, no output signal.

Maybe someone have an idea of what I can do about this problem?

Thanks

[Takumi_Ogata]

Welcome

@ygjk

i was able to make some effects works (but not potentiometers), but since an hour or so, impossible to ear anything anymore.

Could you please tell me more about this?

And I would like to know more about how the audio jacks are connected. Thanks!!

[ygjk]

Hi, thanks a lot for your answer!

Here’s what happened:
At first, I successfully uploaded several examples from DaisyDuino (like the Reverb).
The audio worked, but the potentiometers connected to CV1–CV4 (C5–C2 from the 5 V pin) were not responding.

Then I tried a few tests and rewired some parts — mainly moving the pots to ADC_9–ADC_12 and powering them from the 3.3 V pin.
After that, I suddenly lost all audio output.
Now the board powers up normally (red LED on, code uploads fine), but there’s absolutely no sound on the outputs, even with a simple 440 Hz sine test.

Here’s how the audio jacks are connected:

• OUT L: B2 (tip) → jack left output

• OUT R: B1 (tip) → jack right output

• IN L: B4 (tip) → jack left input

• IN R: B3 (tip) → jack right input

• All sleeves are connected to GND (A4/A7).

• ±12 V rails from the Eurorack power ribbon: +12 V = A5, −12 V = A1, GND = A4/A7.

I can confirm +12 V, −12 V, +5 V and +3.3 V are all present.
If you need photos of the wiring, I can upload them too.

Thanks again for your help!

[Takumi_Ogata]

Thank you for the clarification.
Unfortunately, I’m not sure exactly what happened while you were rewiring that led to the audio not coming out anymore.

I recommend referencing Patch.Init()’s schematic on how components like potentiometer can be connected to the SM. And then reference ReverbExample to see which pins are used for the potentiometers. After connecting accordingly, I recommend trying that firmware again.

Please keep me posted

[ygjk]

Hello,

I just tried “Electrosmith Daisy Programmer”.

But there is clearly a problem with the outputs.
I tried “SimpleOscillator” and “TripleSaw” and i have a signal but weirdly high pitch and distorted.

Here is the result with the “TripleSaw” exemple.

But as you can hear, i can use the potentiometers (this is already a win i guess).

[Takumi_Ogata]

Ok, I think we’re making progress though! There’s sound now and potentiometer is working.

Could you try that reverb example that was working for you before? And maybe a simple beep code in DaisyDuino (no need to have potentiomter).

[ygjk]

Hi, sorry life is so complicated and i didn’t touch anything since months.

I wanted to start again on a solid foundation so i bought the pot’, buttons .etc on the official BOM (on the Patch-init docs) to be sure i do everything right.

All i do is with DaisyLib.

I did connect a small screen (SSD1306) and it work perfectly. So i can be sure my pots and buttons are working normaly.

The momentary button on ADC_11 (D9) work perfectly.
I tried so many pots, on C2 → C9 (connected to GND and 3V3 of course.
And i tried on both ADC (D8 and D9).

Impossible to makes my pots working, on the code i did, it should move the percentage.
But nothing.

Since the beginning i had the feeling the pots never worked correctly.
Now i finally see it with the screen and the little test code.

(And of course i send -12v/GND/+12V to it).

Am i missing something ?
I just spend my whole day trying absolutly anything.
So, if it’s an hardware problem, so be it, it’s fine, i’ll buy an other one.

But i need to know, i spend way too much time on this.

Thank you very much.

Gaël

[ygjk]

Just… please d’ont listen to me..!
I suppose i wasn’t doint it the right way.

You can delete this topic, it’s a mess now because of me T.T

[Takumi_Ogata]

Hi Gaël!

It’s great to hear from you again!
Could you please share the code (or firmware from the Web Programmer) that you have been using to test. And please feel free to share a photo of how the components are connected.

Happy to resume troubleshooting with you

[ygjk]

Thank you for your kindness and patience !

It’s difficult to be back at it after such a long time but i manage to do some little things.

Thanks again