Why do my servos buzz loudly even when stationary?

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

Answer: Loud buzzing from servos at rest usually means they’re fighting to hold a position due to constant torque or electrical noise. First, check if your servo is powered with the correct voltage and current as per its specifications—overvoltage or insufficient power can cause buzzing. Next, ensure your servo’s control signal is steady; a jittery or noisy PWM signal can make the servo motor constantly adjust, causing noise. Use a stable signal source or try a different controller channel. Also, verify the servo isn’t mechanically bound or under excessive load, as this forces the motor to strain and buzz. If your setup uses continuous power to hold position, consider adding a servo tester or controller that can reduce holding torque or cut power when idle. Finally, try swapping the servo for a known good one to rule out hardware faults. Taking these steps should reduce or eliminate the buzzing noise from your servo when it’s not moving.