Would this work? I just hear noise from the PlayMODFromPROGMEMToDAC example, which uses pin 25 DAC:

#include <Arduino.h>
#include "AudioFileSourcePROGMEM.h"
#include "AudioGeneratorMOD.h"
#include "AudioOutputI2S.h"
#if defined(ARDUINO_ARCH_RP2040)
    #define WIFI_OFF
    class __x { public: __x() {}; void mode() {}; };
    __x WiFi;
#elif defined(ESP32)
    #include <WiFi.h>
#else
    #include <ESP8266WiFi.h>
#endif

// enigma.mod sample from the mod archive: https://modarchive.org/index.php?request=view_by_moduleid&query=42146
#include "enigma.h"

AudioGeneratorMOD *mod;
AudioFileSourcePROGMEM *file;
AudioOutputI2S *out;

void setup()
{
  WiFi.mode(WIFI_OFF); //WiFi.forceSleepBegin();
  Serial.begin(115200);
  delay(1000);

  audioLogger = &Serial;
  file = new AudioFileSourcePROGMEM( enigma_mod, sizeof(enigma_mod) );

   /* HERE! */
   // ↓
   // ↓
   out = new AudioOutputI2S(0, 1); //Uncomment this line, comment the next one to use the internal DAC channel 1 (pin25) on ESP32
   // ↑
   // ↑
//  out = new AudioOutputI2S();
  mod = new AudioGeneratorMOD();
  mod->SetBufferSize(3*1024);
  mod->SetSampleRate(44100);
  mod->SetStereoSeparation(32);
  mod->begin(file, out);
}

void loop()
{
  if (mod->isRunning()) {
    if (!mod->loop()) mod->stop();
  } else {
    Serial.printf("MOD done\n");
    delay(1000);
  }
}

 

I changed the configuration of all three pins I have available.
I get a bit more than noise now, but it's garbage.

 

Try a preamp decoupled with a capacitor into the speaker amp.

 

Please use details for the "garbage" sounds:
1) Clipping distortion because the output power is not enough?
2) Mains hum because a shielded audio input cable was not used?
3) No low frequencies because the computer speakers are too small?
4) Overall bad sounds because the computer speakers are too cheap?

 

Hello,

What is the level that is coming from the DAC pins?
It could well be that the signal input for the amplifier must be lower as 1 Vpp.
A higher input voltage will lead to clipping and high distortion.
Also the use if capacitors between the DAC and audio connector may help.

Bertus

 

Don't most amplified computer speakers have an input volume control so that the input levels are always low enough for the amplifiers?

 

Hi Adam,
Check out this video, Andreas explains the ESP32 audio function.
E

 

@GetDeviceInfo
I tried putting an 1000 Ω resistor and a 22uF capacitors in series.

@Audioguru again
The garbage sound seemed the same:
https://youtube.com/shorts/1lHb5mFtW6Y?feature=share

@bertus
The DMM measured 0.5-0.8 V (from DAC pin 25).

 

I tried this sketch too:

/*
  LAB Name: ESP32 Audio Music With DAC Example
  Author: Khaled Magdy
  DeepBlueMbedded 2023
  For More Info Visit: www.DeepBlueMbedded.com
*/

#include <driver/dac.h>

// Timer0 Configuration Pointer (Handle)
hw_timer_t *Timer0_Cfg = NULL;

// Variable To Control The TMR0 Auto-Reload Register Value In Order To Change The TimerInterrupt Interval
// Which Enable Us To Control The Output WaveForm's Frequency
uint64_t TMR0_ARR_Val = 10;

// Sine LookUpTable & Index Variable
uint8_t SampleIdx = 0;
const uint8_t sineLookupTable[100] = {
  128, 136, 143, 151, 159, 167, 174, 182,
  189, 196, 202, 209, 215, 220, 226, 231,
  235, 239, 243, 246, 249, 251, 253, 254,
  255, 255, 255, 254, 253, 251, 249, 246,
  243, 239, 235, 231, 226, 220, 215, 209,
  202, 196, 189, 182, 174, 167, 159, 151,
  143, 136, 128, 119, 112, 104, 96, 88,
  81, 73, 66, 59, 53, 46, 40, 35,
  29, 24, 20, 16, 12, 9, 6, 4,
  2, 1, 0, 0, 0, 1, 2, 4,
  6, 9, 12, 16, 20, 24, 29, 35,
  40, 46, 53, 59, 66, 73, 81, 88,
  96, 104, 112, 119
};

// The Timer0 ISR Function (Executes Every Timer0 Interrupt Interval)
void IRAM_ATTR Timer0_ISR()
{
  // Send SineTable Values To DAC One By One
  dac_output_voltage(DAC_CHANNEL_1, sineLookupTable[SampleIdx++]);
  if (SampleIdx == 100)
  {
    SampleIdx = 0;
  }
}

void setup()
{
  // Configure Timer0 Interrupt
  Timer0_Cfg = timerBegin(0, 80, true);
  timerAttachInterrupt(Timer0_Cfg, &Timer0_ISR, true);
  timerAlarmWrite(Timer0_Cfg, TMR0_ARR_Val, true);
  timerAlarmEnable(Timer0_Cfg);
  
  // Disable DAC1 Channel's Output
  dac_output_disable(DAC_CHANNEL_1);  // pin 25
}

void loop()
{

  TMR0_ARR_Val = 50;
  dac_output_enable(DAC_CHANNEL_1);

//  delay(1000);
//
//  TMR0_ARR_Val = 20;
//  dac_output_enable(DAC_CHANNEL_1);
//
//  delay(1000);
//
//  TMR0_ARR_Val = 10;
//  dac_output_enable(DAC_CHANNEL_1);
//  delay(1000);
//
//  TMR0_ARR_Val = 7;
//  dac_output_enable(DAC_CHANNEL_1);

  // Update The Timer Interrupt Interval According To The Desired Tone
  timerAlarmWrite(Timer0_Cfg, TMR0_ARR_Val, true);
}

https://deepbluembedded.com/esp32-dac-audio-arduino-examples/

Nothing even though the DMM reads about 0.5 V from Ch1 or pin 25.