Description: Electronic hum or buzz, around 50 Hz frequency

Description: Electromagnetic noise, hum and whine

Description: Electromagnetic noise, hum and buzz

Description: Electromagnetic noise, hum and buzz

Description: Electromagnetic noise, pulses and buzz

Description: Electromagnetic noise, hum and buzz

Description: Electromagnetic noise, hum and buzz

Description: Electromagnetic noise, hum and whine

Description: Electromagnetic noise and random overtones

Description: Electromagnetic noise, repeating rising note

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