question about power adaptors

[Matt Joyce]

Hello,

I have a number of old laptop power adaptors.

Dell 65w 19v 3.34A for instance.

is there any  technical or safety reason not to repurpose them to power a rpi and powered hub?
Use a step-down such as this?

https://www.amazon.com.au/DIGISHUO-5A-XL4015-Adjustable-Voltmeter/dp/B0D6B14HGF

Regards

Matt

[Jenna Nelson]

There's no real reason not to- they have more than enough power (65W vs max of about 15W for Pi, which will never go near that ceiling, although it might get close if there are peripherals drawing power). So long as you use a good buck converter and you respect both the power limitations of the buck converter (mostly current draw) and thermal limits. Thermals are the biggest "downside" in that buck converters can hot, so you may need a heat sink- easiest to suck it and see for your particular situation.

The only other reason not to is that it's kind of a lot of work when USB power supplies are pretty cheap nowadays. I can find 65W GaN chargers with an AU plug on Aliexpress for about $6 (and they'll be good chargers, not pieces of crap). I'll pay that to just not to have to fiddle around with the soldering.

Jenna

 

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[Matt Joyce]

yeah, messing about with connectors and finding/printing an enclosure isn't appealing.

seems a waste to have these adaptors sitting there and then order new stuff.....

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[Sophie Parker]

with these adapters: https://www.aliexpress.com/item/1005006352495394.html and similar, you can reuse all those 19V PSUs as 65W USB type C adapters for laptops. quite useful.

I don't know if they actually down-convert to 5V, or only output 19V, but still better than chucking them.

Sophie Parker

Luminesce

sop...@luminesce.lighting

luminesce.lighting

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