Fixing analog audio on the $2.58 HDMI-to-VGA adapter

Re:Fixing analog audio on the $2.58 HDMI-to-VGA adapter by lebuffon on Tuesday July 07, 2026 @09:37PM (#48826412)

Back in the good old days of analog audio we made differential audio inputs with Iron and copper. :-)

Transformers are amazing at reducing common mode noise like induced hum, but rather expensive compared to the price of these boards.

Fun fact: The entire landline telephone system used to rely on balanced lines with transformers for in/out. The hum nulling is so good that trunk lines had no shielding inside buildings.

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Re:Fixing analog audio on the $2.58 HDMI-to-VGA adapter by olelele on Wednesday July 08, 2026 @04:02AM (#48828970)

there are transformers and transformers.

A lundahl or murata, the kind used in Studer, Neve & Yamaha mixer preamps can cost a whole lot.

There are pretty decent cheap ones from china these days too.

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Re:Fixing analog audio on the $2.58 HDMI-to-VGA adapter by lebuffon on Friday July 10, 2026 @08:16AM (#48858854)

And don't forget AMI Tabfunkenwerk from USA.

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