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A comment on PoE for Raspberry Pi for under $2. Parent comment

Re:PoE for Raspberry Pi for under $2 by albert007_d on Saturday September 28, 2019 @05:46AM (#21099441)
Thats the reason why diode is used for protecting the non-PoE switch's Port when raspi is accidentally powered through micro-usb port(or usb-c for pi-4)
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