ESP32-P4-Nano Mic + Wifi = Uniform Static on the Mic.

[NonaSuomy]

When you enable the analog MIC and Wifi (The Mic is physically right beside it) you get repeating static on it. If you switch to ethernet, the static goes away. Is there a hardware design failure in placing the mic too close to the wifi module?

01_stt-stt.faster_whisper.wav

[Y1hsiaochunnn]

Would you mind sharing your power supply diagram? Let's measure the voltage of the 5V pin connector.

[NonaSuomy]

It's a 2A Samsung phone adapter. I tried multiple different adapters and power sources with the same results. That repeated noise is coming from the wifi module. Voltage level doesn't seem to matter. Just whether the Wifi is on or not. Works fine with PoE and Ethernet on.

Wifi not enabled 5.14V
Wifi enabled 5.123V

Analog circuits are extremely susceptible to interference. Probably the worst spot putting it next to that module.

[Y1hsiaochunnn]

Then it's not a power supply issue. Could you please take a high-resolution picture of the front and back of the hardware and reply it here?

[NonaSuomy]

[Y1hsiaochunnn]

This is because a filter capacitor has been added on the hardware for noise filtering. You can adjust it as shown in the figure: change the red one to 1uf and the blue one to NC.

[NonaSuomy]

I don't have the skill or parts to change those out. This should work from the factory.