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97 points MYEUHD | 1 comments | 12 Dec 25 07:36 UTC | HN request time: 0s | source

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cl3misch ◴[12 Dec 25 12:24 UTC] No.46243471[source]▶

> Basic phone charger <1A USB power supply was not enough to even finish booting, but a ~2A was enough to boot and launch octo4a

So it's drawing >1A over a single diode? Let's say 1.4A and 700mV voltage drop over the diode, then it's roughly 1W over the diode. Won't it get pretty hot?

replies(1): >>46244082 #

ZiiS ◴[12 Dec 25 13:46 UTC] No.46244082[source]▶

>>46243471 #

The diagram calls it a 1N4001 which is rated to sustain 1A (but 40% over is probably fine). A safe 1N5400 would still be pennies.

replies(1): >>46244251 #

1. mystifyingpoi ◴[12 Dec 25 14:05 UTC] No.46244251[source]▶

>>46244082 #

Author should've just used a $1 adjustable buck converter with USB-C in. There would be no issues with heat, or the need for a big capacitor even.

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Smartphone without a battery (2022)