01-04-2019, 05:01 PM
(12-10-2018, 05:38 PM)HemiRick Wrote: Someone needs to look at the output of an Anker battery on an oscillscope and see if it is really as quiet as we think, I mention this because most have 3.7 volt battery and a DC-DC power chip to up to 5V. I'm wondering if this chip makes any noise?
All cheap voltage regulators make noise, some worse than others, but what is used in a charger like you describe was not intended for audio purposes and so it won't look pretty in terms of measurements.
It could however still sound OK, largely because one of the main benefits in using a battery instead of AC power is the reduction of ground loop potential. So what may seem of no benefit purely in the context of noise from the cheap regulator, may in fact still sound different/better due to a reduction in ground loop currents.
Not all ground loops manifest as a loud hum, some are much lower in level but clearly sound quality improves once they are removed, and one good way to try that is with a battery.
