Archive for August 30th, 2016

Reduce a Computer’s Audio Output Line Hum

📅 August 30, 2016
isolator“Why do I hear a faint hum from my computer’s audio output?”

Computers are electrically noisy environments, and all of those wires and fans and whatnot operating at various frequencies can have unpleasant side-effects on a computer’s audio output.

If you enjoy listening to music played from your computer and if you use the computer’s analog stereo outputs (the 3.5mm line out jack) to connect to an external amplifier or receiver, then you have no doubt encountered the low-frequency hum effect.

Not a mere hiss due to a noisy sound card, but a low hummmmmmmmm that is heard consistently whether or not audio is playing and regardless of the volume level.

This can happen with any home audio equipment, not just computers. Often, it is caused by a ground loop, and the best way to reduce or nearly eliminate this hum is to electrically isolate the audio output (from the computer) from the audio input of the receiver/amplifier.

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