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 is usually caused by continuous power applied to hold their position, often due to a constant signal or incorrect neutral position. To fix this, first check your servo’s neutral signal: ensure your controller or transmitter outputs a proper 1.5 ms pulse width (typically the centre point) when the servo should be stationary. Use a servo tester or your control software to confirm this. Next, verify your servo isn’t being asked to hold an impossible position; if it's mechanically constrained, it will strain and buzz. Also, check your power supply—insufficient voltage or current can cause servo noise. If you’re using a digital servo, buzzing can be normal due to higher holding torque, but it should not be excessively loud. Finally, try disconnecting the signal wire while powered; if buzzing stops, the issue is with the control signal. Adjust your controller settings accordingly, and consider using a servo with a mechanical neutral position suited to your setup.