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 servos at rest usually means they’re receiving a continuous signal telling them to hold a position under load. This causes the motor to strain, generating noise. First, check your control signal: ensure the servo’s input is set to a stable neutral pulse width (usually around 1500 microseconds for standard servos). If your controller or transmitter is sending jittery or incorrect signals, the servo will buzz trying to correct its position. Next, inspect the mechanical setup—if the servo horn is mechanically blocked or under high load, it will buzz trying to maintain position. Try disconnecting the servo horn and see if the noise stops. Also, check your power supply; insufficient voltage or current can cause abnormal servo behaviour. Use a regulated 5–6 V supply capable of delivering the servo’s stall current (typically 1–2 A). If you’re using a microcontroller, make sure the signal pin is correctly configured and not floating. Finally, some cheaper servos buzz more due to lower quality electronics—consider upgrading if problems persist.