Speaking of noisy computers and electronics, I designed a PCB with an ESP32 bluetooth/WiFi chip on it. I'm far from an expert in board design, and my board unsu

Speaking of noisy computers and electronics, I designed a PCB with an ESP32 bluetooth/WiFi chip on it. I'm far from an expert in board design, and my board unsurprisingly emits a buzz when the Wifi/BT radio is transmitting or receiving. It's interesting though, when it's using BLE you can hear the frequency hopping as it changes channels, and then you get entirely different sounds when it stops BLE and uses just WiFi. But yeah I should probably fix that... Possibly caused by the piezoelectric effect on an SMD ceramic capacitor, making it vibrate and hit the PCB surface at an audible frequency.