Computer Audio Asylum

Music servers and other computer based digital audio technologies.

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RE: Rpi PS: Not what I expected

Posted by gordguide on May 30, 2017 at 07:31:24:
Some information that you might find useful. Not a complete copy due to the usual legal issues, but enough.

" ...
OK, we threw the Teradak PSU on the scope today ...

Whilst I didn't drag my SBTalong for testing the output of its USB port when fed via the SBT switching PSU, we did have an apple 5V USB power supply and a generic 5V USB power supply.

The generic power supply revealed around 250-300mV of noise under no load, and an increase over this figure when under load.

The Apple power supply revealed around 80mV of noise under no load, and an increase over this figure when under load.

The Teradak linear PSU showed 2mV of noise... but unfortunately this was the limit of our testing, as there was 2mV of noise with nothing connected to the scope. ..."