Generate a true analog signal using Arduino I am looking for a way to create a true analog output with the arduino uno. I am constantly reading an analog input on a0 pin, all i want to do is send the same signal as output. I know arduino convert the signal into pwm so have can i convert it back to true analog signal.I have a dac too but not getting proper output.
secondly, i want to send same signal by converting it into bits through Ethernet so how do i send and receive the signal.
here is my code for dac.
#include &quot;Wire.h&quot;
#include &quot;MCP4725.h&quot;
MCP4725 MCP(0x60);
uint32_t microphonePin=A0;
uint32_t threshold=800;
const int ledPin=13; 

void setup() {
    Serial.begin(115200);
    pinMode (ledPin, OUTPUT);
    Serial.print(&quot;MCP4725 test program: &quot;);
    Serial.println(MCP4725_VERSION);
    if (MCP.begin() == false)
     {
       Serial.println(&quot;Could not find sensor&quot;);
     }

    MCP.begin();
 }

void loop() {
   uint32_t sensorValue=analogRead(microphonePin);
   MCP.writeDAC(sensorValue);
   Serial.println(MCP.getValue());
   if (MCP.getValue()&gt;threshold)
    {
      digitalWrite (ledPin, HIGH);
    }
   else{ digitalWrite(ledPin, LOW); }

  } 

here is my circuit for audio amplifier

and for the speaker it is connected on DAC out.
FYI:I am able to read the data on my serial monitor form mic and i am also able to so do some operation by just using mic and GUi. I just want to here what i am saying on speaker.
I see that MCP4725 uses Wire library with the default clock of 100,000 kb/sec.
At a rough estimation each call to MCP.writeDAC or MCP.getValue will be at least 32 bits long and you use three of them in each loop.
This one:
   Serial.println(MCP.getValue());
   if (MCP.getValue()&gt;threshold)

is redundant, you should store the value in a temporary variable and use-it in both &quot;print&quot; and &quot;if&quot;.
With 10us for each bit that means 1060 us for each loop. The analog read also takes 100us to complete. Over all 1160us minimum.  Is the MCP.getValue() really needed?
That means that your maximum sample frequency is 860hz and the maximum bandwidth of 430hz. I doubt that this is an acceptable bandwidth for a microphone.
Even so, the output signal will not look similar at all, you need a higher bandwidth or to limit,  if possible, the bandwidth of the input signal.
In some limits you can modify the MCP4725 library to use fast wire clock four times faster if it suits your requirements. If you also drop the two MCP.getValue() calls that will be again almost three times faster, up to 5khz.
Also you might search for faster ADC on Arduino.
Update after OP microphone amplifier schematic.
The ADC works only with positive voltages. Short the output capacitor of the amplifier!