Why do my servos make a loud buzzing noise even when stationary?

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

Answer: Loud buzzing from a servo at rest usually means it's trying to hold a position under load or receiving a jittery signal. First, check your servo's control signal—ensure your transmitter or controller outputs a clean, steady pulse width modulation (PWM) signal. Interference or poor wiring can cause the servo to constantly adjust, creating noise. Next, verify the servo isn’t mechanically overloaded; if it’s pushing against a stiff linkage or stuck, it will strain and buzz. Try freeing the linkage or reducing the load. Also, confirm the power supply is stable and sufficient—low voltage or current can cause erratic servo behaviour. If you have a multi-servo setup, test the noisy servo alone to isolate the problem. Finally, some cheaper servos naturally buzz when holding position due to internal design. If the noise is excessive or accompanied by heat, consider upgrading to a higher-quality servo. Following these steps should help reduce or eliminate the buzzing noise.