Why Are My Servos Buzzing Loudly Even When Stationary?

Question: Why do my servos buzz loudly even when not moving?

Answer: A loud buzzing noise from your servos when they’re not moving usually means they’re constantly trying to hold a position under load or receiving a jittery signal. First, check your servo’s signal input: an unstable or noisy PWM signal can cause the motor to vibrate. Use a clean, stable signal source like a quality receiver or microcontroller. Second, ensure the servo isn’t mechanically overloaded or binding; if the horn or linkage is stuck, the motor strains and buzzes. Try moving the servo horn gently by hand to see if it’s tight. Third, verify your power supply provides adequate voltage and current—insufficient power can cause buzzing. Finally, if you’re using a continuous rotation servo or one with a faulty potentiometer, it might struggle to find the correct position. Replacing or recalibrating the servo can help. By checking signal quality, mechanical load, and power supply, you can usually stop the buzzing and enjoy smooth, quiet servo operation.