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 indicates they’re under constant load or receiving a jittery signal. First, check if the servo is being held at a position where mechanical strain or binding occurs—try gently moving the horn to see if the noise changes. Next, verify your control signal is stable; noisy or weak PWM signals can cause the servo to jitter and buzz. Use a quality receiver or microcontroller with proper signal timing (typically 50Hz). Also, ensure your power supply is sufficient; servos draw current even when idle, and low voltage can cause buzzing. If you’re using a servo tester or controller, try adjusting the centre position or trimming the neutral point. Finally, some cheap servos buzz more due to lower quality gears or motors—consider upgrading if noise persists. By checking mechanical freedom, signal quality, and power, you can usually eliminate or reduce unwanted servo buzzing.