3x powersupply for rpi

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3x powersupply for rpi

Postby fboe » 02 Nov 2016, 20:08

Hi

I have made some ekspirement with linear power supplies for the rpi3. First I have powered it with 5v at the gpio, which gave an enormous improvement. But then I removed the "crappy" onboard regulator (for 3,3 and 1.8v) at the rpi board, and powered it direcly at pp8 and pp9. Oh my.... another enourmous improvement in sound :-)

Are there someone who have tried something similar?
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Re: 3x powersupply for rpi

Postby rikardo1979 » 04 Nov 2016, 12:48

interesting
Do you have any pictures, schematics, etc?
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Re: 3x powersupply for rpi

Postby pistollero » 05 Nov 2016, 12:55

fboe wrote:Hi

I have made some ekspirement with linear power supplies for the rpi3. First I have powered it with 5v at the gpio, which gave an enormous improvement. But then I removed the "crappy" onboard regulator (for 3,3 and 1.8v) at the rpi board, and powered it direcly at pp8 and pp9. Oh my.... another enourmous improvement in sound :-)

Are there someone who have tried something similar?

Hi. Can you explain how you do it?
Thks... i would like to try
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Re: 3x powersupply for rpi

Postby fboe » 06 Nov 2016, 18:08

Hi

I have attached two picures wgere you can see where I have removed the onboard regulator, and a picture where you can see where I connect the power. PP8; 3.3v og PP9 1.8v

FullSizeRender.jpg
FullSizeRender.jpg (196.13 KiB) Viewed 3997 times

FullSizeRender (1).jpg
FullSizeRender (1).jpg (205.96 KiB) Viewed 3997 times
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Re: 3x powersupply for rpi

Postby pistollero » 06 Nov 2016, 18:12

fboe wrote:Hi

I have attached two picures wgere you can see where I have removed the onboard regulator, and a picture where you can see where I connect the power. PP8; 3.3v og PP9 1.8v

FullSizeRender.jpg

FullSizeRender (1).jpg

Very nice:). There is only one 3.3v cable and a 1.8v cable....
They dont have ground?
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Re: 3x powersupply for rpi

Postby fboe » 06 Nov 2016, 18:22

The grund is connected to GPIO pin 6, and the 5v to GPIO pin 2.

Raspberry-Pi-GPIO-Layout-Model-B-Plus-rotated-2700x900.png
Raspberry-Pi-GPIO-Layout-Model-B-Plus-rotated-2700x900.png (79.65 KiB) Viewed 3989 times
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Re: 3x powersupply for rpi

Postby hondagx35 » 06 Nov 2016, 23:37

Hi fboe,

i like the idea.
Thank you for sharing this.

Your soldering skills need some improvement 8-)

Frank
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Re: 3x powersupply for rpi

Postby fboe » 07 Nov 2016, 08:50

Yeah, sorry for the poor soldering (it's so damm small) - the pictures are from my first prototype, which is now dead because I tried to replace the crystal with a better one......that was not a success.....
Are there someone who have tried that with success?
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Re: 3x powersupply for rpi

Postby pelliott321 » 12 Nov 2016, 11:41

Fboe
Wow this is great, I have been the wanting to experiment with power supplies and this has given me the push
Could you share the details of the actual ps you used/built
Thanks
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Re: 3x powersupply for rpi

Postby pelliott321 » 12 Nov 2016, 11:49

Another couple od questions
First is ther a published schematic of the Pi3
PP8 and PP9 which is 3.3 and which is 1.8v
Also is there a chart of current requirements of the Pi3 showing current drain when various functions are turned on or off, whether different I/O is used or not
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