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This is the sound of a Maha MH-C9000 (Powerex WizardOne ) battery charger amplified. It is the sound of the internal transformer pulsing to charge some AA NiMH batteries. Recording chain: Rode NT4 (stereo mic) – Sound Devices Mix Pre (Pre amp) – Edirol R-09 digital recorder (24 bit 44.1 khz > 16 bit post).
Type
Wave (.wav)
Duration
0:08.060
File size
1.4 MB
Sample rate
44100.0 Hz
Bit depth
16 bit
Channels
Stereo
16 years ago
So I'm NOT the only one who can hear sounds from purely electronic devices that don't have speakers. Thanks for pointing this out.