L.P. Alpha DC power experiments and observations

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ccs_hello
Posts: 427
Joined: Sat Oct 13, 2018 9:16 pm

Sun Jan 13, 2019 9:31 pm

I used Apple 61W type-C power adapter MNF72LL/A and a quality USB-C cable (male type-C to male type-C on both ends.)
<-- this type is designed for MacBook Pro

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nyteshade
Posts: 3
Joined: Sun Jan 13, 2019 6:14 pm

Mon Jan 14, 2019 6:04 am

Thanks for your reply. Have any attempts been made to use some USB-C hub that allows high voltage charging in an effort to use the usb-c port for display port as well?

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ccs_hello
Posts: 427
Joined: Sat Oct 13, 2018 9:16 pm

Mon Jan 14, 2019 2:43 pm

Pls search forum posts. There was a discussion one brand of such "USB-C display port cable with power injection" work and another brand did not. Vaguely recall the one works has the "Amazon Recommended" tag on such item. However, search for the post first.

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Knightshadow1371
Posts: 28
Joined: Mon Sep 03, 2018 7:24 pm

Fri Apr 26, 2019 1:23 pm

nyteshade wrote:
Mon Jan 14, 2019 6:04 am
Thanks for your reply. Have any attempts been made to use some USB-C hub that allows high voltage charging in an effort to use the usb-c port for display port as well?
Nyteshade,
Did you ever find a reasonable USB-C hub with power pass through and a extra USB-C port that has display capability?

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Knightshadow1371
Posts: 28
Joined: Mon Sep 03, 2018 7:24 pm

Fri Apr 26, 2019 1:40 pm

ccs_hello wrote:
Sun Jan 13, 2019 9:31 pm
I used Apple 61W type-C power adapter MNF72LL/A and a quality USB-C cable (male type-C to male type-C on both ends.)
<-- this type is designed for MacBook Pro

Ccs_hello,

This power supply should be reasonable? I know the voltage and amps are good. I just want to know if 36W is enough for the lattepanda with an attached external GPU.

https://www.amazon.com/gp/product/B07HN ... UTF8&psc=1

And where can I find one of those compacitors you mentioned earlier In this post? Or Dobie not need one?

"I also connected a 2200uF 16V electrolytic capacitor on the USB end to take care of instantaneous power bursty needs"

Thanks!

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ccs_hello
Posts: 427
Joined: Sat Oct 13, 2018 9:16 pm

Fri Apr 26, 2019 1:56 pm

36W is okayish to supply power just to LP Alpha (assuming not many attached peripherals/power-hungry fire-breathing NVMe SSDs (just kidding...)
I.e., power budget for a flexible platform like LPA is very hard to give a concrete number.

Re: eGPU usage
eGPU definitely needs a separate power budget calculation.
Some low end graphics card can easily consume 90W, while a top-end can burn 500W easily.

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Knightshadow1371
Posts: 28
Joined: Mon Sep 03, 2018 7:24 pm

Fri Apr 26, 2019 5:17 pm

Great, thanks ccs_hello!

I will take that into account. Someone in a different post posted a link where a guy used a xbox 360 power brick, I think it was 100W. It's not bad to have too many watts even if they aren't being used?

What about the capacitor, you recomend were you got yours?

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ccs_hello
Posts: 427
Joined: Sat Oct 13, 2018 9:16 pm

Fri Apr 26, 2019 10:09 pm

Get the electrolytic capacitor(s) from the kit
https://www.amazon.com/WINGONEER-Electr ... 0734T3GJ9/

Ebay is also fine
https://www.ebay.com/itm/2200uf-25v-Cap ... 2432042234

Xbox 360 Slim Power Supply, YCCSKY AC Adapter (12V 10.83A) is very nice.

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Knightshadow1371
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Sat Apr 27, 2019 10:19 pm

Thanks ccs_hello!

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ender
Posts: 90
Joined: Wed Dec 27, 2017 3:55 pm

Mon Jul 29, 2019 5:13 am

I think the Surface Pro 6 will run the adapter, right?

https://www.amazon.com/Batpower-Charger ... pons&psc=1

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