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 when stationary usually means the servo motor is fighting to hold its position. This can happen if the servo is under mechanical strain or if the control signal is jittery. First, check that the servo isn’t physically blocked or overloaded – remove any binding parts or reduce the load. Next, verify your control signal is stable; noisy or incorrect PWM signals can cause constant small movements and buzzing. Use a reliable servo tester or a microcontroller with clean code. Also, ensure the servo is receiving the correct voltage as per its specifications; too low or too high voltage can cause buzzing. If you’re using a continuous rotation servo, remember it’s designed to spin rather than hold position, so buzzing might be normal. Finally, try a different servo to rule out hardware faults. Adjusting these factors typically stops the buzzing and extends servo life.