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 trying to hold a position under load or receiving a constant signal that demands torque. First, check that your servo isn’t mechanically blocked or under strain; if it’s trying to hold a position against resistance, the motor will buzz as it works hard. Next, verify your control signal—ensure your transmitter or microcontroller is sending a steady, correct pulse width (usually around 1500µs for centre position). A noisy or incorrect signal can cause the servo to jitter or buzz. Also, check your power supply; insufficient voltage or current can cause the servo to struggle and buzz. If your servo has a potentiometer, it may be worn or misaligned, causing the feedback loop to oscillate. Try disconnecting the servo from the load and see if the buzzing stops. Finally, if none of these help, the servo might be faulty or damaged and may need replacement. Regularly calibrate your servo and avoid forcing it beyond its mechanical limits to prevent buzzing issues.