This is the recording of a 50Hz electric hum.
The sound was recorded connecting an old piezo pickup to the recorder line input.
Recorder: Zoom H4;
Line input;
Processing: no processing.
50 Hazh_hm 聲道：1 類型：wav buzz、hum、50Hz、electricity 蜂鳴器、哼、50搖、電力 資料來源：freesound ( https://freesound.org )
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