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 usually happens because they’re trying to hold a position under load or their control signal is jittery. First, check if the servo is physically blocked or under strain; reduce any mechanical load or friction. Next, ensure your control signal (PWM) is stable and correctly centred—an unstable signal causes the servo to constantly adjust, creating noise. Use a servo tester or your controller to send a clean, neutral pulse (usually around 1500µs). Also, verify your power supply is sufficient and clean; low voltage or noise can cause buzzing. If you’re using an analogue servo, consider upgrading to a digital one, which holds position more quietly. Finally, check your wiring for loose connections or interference. Addressing these steps usually stops the buzzing and prolongs servo life.