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RE: Implemented fiber optic...


I took the SMPS off the media converters and used an Anker external battery (5V/4.5A max). Dang, sure enough, the sound improved (slightly) some more.

What most people don't realize is those USB power packs do not provide 'clean' 5V DC battery output. They are basically a form of noisy switching power supply.

The Anker and pretty much all of them use an inductor and switching boost converter chip inside to covert the 3.7v nominal from Li batteries to +5VDC.

In other words, it's a 'switching power supply' and the +5VDC out is far from 'clean'. The output 'noise' from such devices can be quite high compared to even a wall wart AC power module.






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