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 means the servo is constantly trying to hold a position under load or receiving a jittery control signal. First, check your servo’s neutral position in your controller or transmitter; ensure it’s centred properly. If the servo is fighting against a mechanical load or binding, the motor will buzz as it struggles to maintain position—try moving the servo arm gently by hand to detect any resistance or tight spots. Also, inspect your wiring and connections for any loose or noisy signals; a poor signal can cause the servo to 'hunt' and buzz. If you’re using an Arduino or similar, verify your PWM signal is stable and at the correct frequency. Finally, try powering the servo from a dedicated, stable power supply with sufficient current (usually 4.8–6V for standard servos), as voltage drops can cause buzzing. Adjust these factors step-by-step to reduce or eliminate the buzzing noise.