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ESP32-Wroom coil whine (high beeping noise)
Posted: Tue Mar 24, 2020 8:01 pm
by xeroe343
Hello,
Im using the esp32-wroom module on a custom pcb and i recognized a high pitched sound coming from the module.
The chip seems to be working normally, but the sound is quite uncomfortable and also worrying.
Has anybody ever experienced this or an idea what might be causing it?
My first thought was maybe a bad voltage regulator, but directly connecting it to 3v3 doesnt fix the problem either.
Re: ESP32-Wroom coil whine (high beeping noise)
Posted: Wed Mar 25, 2020 1:54 pm
by Sprite
That sounds odd... normally coil whine is because there's a switching power converter that works in the audible range, and either coils or sometimes capacitors vibrating at that frequency. Thing is, the Wroom module does not have any switched power supplies inside, so I wouldn't know where that sound would come from.
Re: ESP32-Wroom coil whine (high beeping noise)
Posted: Thu Jan 11, 2024 8:14 pm
by Jens Deuhr
Yes I also experience high pitch whining sound from ESP32 wroom board . What might be possible reason of it .
Re: ESP32-Wroom coil whine (high beeping noise)
Posted: Mon Jan 19, 2026 5:38 pm
by rvxfahim
I hear same.
My board is a ESP32-CAM from DIYMORE.
The noise comes only when some wifi activity is there, like downloading a file.
Re: ESP32-Wroom coil whine (high beeping noise)
Posted: Tue Jan 20, 2026 2:36 am
by Sprite
I hear same.
My board is a ESP32-CAM from DIYMORE.
The noise comes only when some wifi activity is there, like downloading a file.
That probably is because of the
piezoelectric effect that capacitors have. As WiFi takes a fair amount of power, the voltage over the power supply caps vary a bit depending on the current usage and they expand/contract a little accordingly; the PCB acts as a soundboard for that and that makes it audible.