Why do my servos buzz loudly even when stationary?

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

Answer: Loud buzzing from a servo when it’s not moving usually means it’s trying to hold a position under load or receiving a constant signal that makes it work hard. First, check if the servo is connected to a signal that’s continuously commanding it to hold a position; a noisy or jittery PWM signal can cause buzzing. Use a stable controller or signal source. Second, ensure the servo isn’t physically obstructed or under excessive mechanical load, as this causes the motor to strain and buzz. Third, verify your servo’s power supply voltage and current capacity—insufficient power can lead to buzzing and poor performance. If you’re using a microcontroller, try disconnecting the signal wire; if buzzing stops, the issue is with the signal. Lastly, some cheaper servos buzz more due to lower quality gears or motors. Replacing the servo with a higher-quality one can help if the buzzing is unacceptable. Adjusting these factors should reduce or eliminate the buzzing noise.