Why Are My Servos Buzzing Loudly When Stationary?

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

Answer: Loud buzzing from servos at rest usually indicates they are under constant load or receiving a jittery signal. First, check your control signal for noise or instability—using a clean, stable PWM signal from your controller can fix this. Next, ensure the servo horn isn't mechanically stressed or binding; free the servo arm and verify it moves smoothly by hand. If the servo is holding a position against strong resistance, it will buzz as it tries to maintain torque—reduce the load or use a stronger servo. Also, some servos buzz when powered but not commanded to a neutral position; try sending a neutral pulse to see if the noise stops. Finally, verify your power supply is stable and providing correct voltage, as voltage dips can cause erratic servo behaviour. Taking these steps should reduce or eliminate the buzzing and protect your servo from damage.