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

Troubleshooting and Support
1

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 :slight_smile:

2

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

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

4

Welcome :slight_smile:

Could you please tell me more about this?

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

5

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!

6

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 :slight_smile:

7

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).

8

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).