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 a servo at rest usually means it’s constantly trying to hold a position under load or receiving a jittery signal. First, check your control signal: ensure your transmitter or controller is centred and stable, as noisy or off-centre signals cause the servo to twitch and buzz. Next, verify the servo isn’t mechanically bound or overloaded—any resistance makes the motor strain and buzz. Try disconnecting the servo horn and see if the noise stops; if it does, reduce mechanical friction or adjust linkages. Also, confirm the power supply voltage and current are within the servo’s specs—insufficient power can cause buzzing. Finally, if the servo is analogue, consider upgrading to a digital servo which holds position more smoothly. By checking signal quality, mechanical load, and power supply, you can usually eliminate unwanted buzzing noise.