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 are constantly trying to hold a position under load or receiving jittery signals. First, check your servo's control signal: ensure your transmitter or controller is sending a stable, clean PWM signal without noise. Use a servo tester or oscilloscope if possible. Next, verify the servo isn’t mechanically overloaded—remove any heavy loads or binding linkages that could force the motor to strain. If your servo is powered by a voltage higher than recommended, it may buzz more; confirm your power supply matches the servo’s specs (typically 4.8–6V). Also, some cheap or worn servos have internal gear or motor issues causing buzzing. Try swapping the servo for a known good one to isolate the problem. Finally, if your setup involves continuous power to hold position, consider adding a servo controller with a deadband or reducing holding torque to minimise buzzing noise. Taking these steps should help reduce or eliminate the buzzing sound.