Why do my servos buzz loudly even when stationary?

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

Answer: A loud buzzing from servos while stationary usually means they are receiving a constant signal telling them to hold a position under load. This causes the motor to constantly draw current, making the buzzing noise. To fix this, first check your control signal: ensure the pulse width matches the servo's neutral or desired position. Use a servo tester or your transmitter to confirm.

Next, reduce any mechanical load on the servo horn to see if the buzzing stops. If the servo is fighting resistance, it will buzz. Also, check your power supply voltage and current capacity; inadequate power can cause the servo to struggle and buzz.

If you’re using a microcontroller, verify your code isn’t sending jittery or conflicting PWM signals. Finally, swapping the servo for another known-good unit can rule out hardware faults.

In summary: check signal quality, reduce mechanical load, ensure stable power, and test with a different servo. This approach usually eliminates the buzzing noise.