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 under continuous load or receiving a jittery signal. First, check your servo's neutral position in your transmitter or controller; it should be centred at about 1500µs pulse width. If the signal is off-centre, the servo motor tries to hold that position, causing buzzing. Next, ensure your power supply is stable and adequate—low voltage or insufficient current can cause servo noise. Also, inspect the servo horn and linkage: mechanical binding or excessive friction can make the servo strain and buzz. If you’re using a digital servo, it might be more sensitive to slight signal noise; try using a filter or a signal stabiliser. Finally, test the servo on a different channel or controller to rule out transmitter issues. Adjusting these points usually stops the buzzing and keeps servos quiet when stationary.