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 servos at rest is usually caused by continuous power being applied to hold their position, often due to a constant control signal. Here’s how to fix it: First, check your servo signal input—if your controller is sending a signal that constantly commands the servo to hold a specific angle, the motor will buzz as it resists small position changes. Try disconnecting the signal or setting the controller to neutral to see if the noise stops. Second, inspect your power supply; servos can buzz if voltage is too low or unstable. Use a regulated 5V supply and ensure wiring is solid. Third, if you’re using a microcontroller, try adding a small delay or reducing the update rate of the servo signal to avoid constant jitter commands. Finally, if the buzzing persists, the servo itself might be faulty or damaged internally. Replacing it may be the best solution. Remember, a quiet servo at rest means it’s not fighting to hold position unnecessarily.