Why are my servos buzzing loudly even when stationary?

Question: Why do my servos buzz loudly even when not moving?

Answer: Loud buzzing from servos at rest usually indicates they are receiving a constant signal that tries to hold them in a position under load. This can happen if the servo is powered but the control signal is jittery or not centred. To fix this, first check your transmitter or controller to ensure the servo trim is centred and the signal is stable. Next, verify your wiring and connections for any loose or intermittent contacts that might cause signal noise. If you’re using a microcontroller or flight controller, ensure your code or settings send a neutral PWM pulse (typically around 1500µs) when the servo should be stationary. Also, consider the mechanical load on the servo; if it’s forced against a hard stop, the motor will buzz trying to maintain position. Adjust the linkage or reduce the load to prevent strain. Lastly, ensure your servo is suitable for the voltage supplied and isn’t overheating. Following these steps should reduce or eliminate the buzzing noise.