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In Reply to: Raspberry Pi/HiFi Berry encore! posted by Ivan303 on April 10, 2017 at 20:02:51:
...these USB batteries are essentially switch mode power supplies.They typically take a nominal 3.7v Lithium battery and incorporate a boost converter chip (switching power supply circuit) to increase the battery voltage to 5VDC.
The one thing these USB batteries offer is isolation from the AC mains, but their DC output quality may or may not be any better than a wall wart switcher. In other words, you are not getting 'pure DC' off the battery itself but via the switching circuit.
Typical, but there are several such chips on the market
Edits: 04/11/17
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- You do realize that.... - AbeCollins 08:39:34 04/11/17 (9)
- Placebo Effect - Dynobot 09:46:57 04/11/17 (3)
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