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 under continuous strain trying to hold a position. This can happen if the servo is commanded to hold a position against mechanical resistance or if the control signal is jittery. First, check if the servo horn or linkage is binding or stuck; free movement should be smooth. Next, ensure your servo is receiving a clean, stable PWM signal—noise or incorrect pulse width can cause constant corrections and buzzing. If you’re using a microcontroller, verify your code sends precise servo commands without rapid small changes. Also, confirm the servo is powered with a suitable voltage and current; underpowered servos can buzz trying to maintain torque. If the servo is holding a position under load, try reducing the load or adding a mechanical stop to prevent strain. Finally, consider testing the servo on a simple setup to isolate if the buzzing is due to the servo itself or your control system. Following these steps should reduce or eliminate the buzzing noise.