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Raspberry Pi 3B+ does not start with a power bank
Raspberry Pi 3B+ does not start with a power bank
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Old 24th August 2019, 02:33 AM   #21
LinuxGeek is offline LinuxGeek  Germany
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Location: Germany, NRW
But as mentioned earlier, the stepup converters in this cheap powerbanks are switching type and create very much noise in form of high frequency switching. You dont want this in an audio chain. Every cheap china linear psu is by far better suited for your needs.
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Old 4th September 2019, 05:08 PM   #22
easp is offline easp
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You could use what I think TI calls a "narrow-range" power supply architecture.

Use a good USB boost converter to power the Pi. Power the boost converter off a lithium ion battery pack. Charge the pack using a buck/step-down charging circuit powered off a suitable "wall-wart." AC power supply and charger need enough headroom to deal with conversion losses and deliver plenty of power to the Pi.

For example: 12v 20W output SMPS AC-DC supply (like an ultrabook power brick or similar), 4A LiIon charger, USB QC boost module (Quick Charge can output up to 18W, which provides plenty of headroom for spikes from a Pi).

A similar architecture would work with a big linear regulator instead of the boost module, if you want to worry about that.

This boost module has good stable output at 5V ~2A. I don't know about noise though.
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