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In Reply to: RE: Being one who posted by Dynobot on February 15, 2017 at 18:38:49
It looks like the RPi has several of it's own onboard regulators for 3.3V, 1.8V, 2.5V derived from the 5v "bulk power" supplied by the wall wart. But it also uses 5v directly in other areas including the USB interface.The Jameco 5V +/- 0.3V spec isn't that bad for what it is powering (with a preference toward the + side rather than lower). According to the USB spec bus power across VBUS and GND should be a nominal 5V +/- 5%.
The data sheet for the Jameco PSU shows 250mV ripple at 1500mA load which is a greater load than the 1000mA the PSU is rated for so the ripple figure should be lower at lower loads. But 250mV is very high.
RPi Power
Edits: 02/16/17 02/16/17 02/16/17Follow Ups:
When I get home I will test it under load UI see what kind of real world ripple it has....
Yes I think I mentioned it in another post that people should bypass the miniUSB power input due to the switching regulator in the RPi.
Using the GPIO is the only way to go if you are going to use a linear regulated power supply.
One of my 'edits' that I attempted in a previous post didn't get posted so I re-edited and reposted.
Are you talking about using a linear power supply on the GPIO for other devices?
No only for the RPI
Hmm, I didn't know you could power it via GPIO.
Yep I only use the GPIO
These are different RPI that I use around the house.
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