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> But USB-C isn't limited to 5V, power delivery is at 20V. That might explain what's going on here (since the user reports 20V on the output) - it thinks that the peripheral is a power hungry device and it's trying to charge it. That's a problem, but it could be that the peripheral is poorly designed and is mistakenly asking for power that it can't actually handle.

This was my interpretation, the host sets the output voltage to 20V incorrectly (due to a software bug or a hardware failure). Putting a crowbar circuit defensively on the peripheral side would save the peripheral.




Ah ok, I misunderstood - yeah it baffles me why manufacturers don't do this. I make it a point to fuse absolutely everything at work, it's a minor expense to save a ton of time later.

Last week I blew up a $100 CO2 sensor because I wired it in backwards. Entirely my fault for not checking the pinout, but a 10 cent diode or a fuse would have saved me.

This is the same issue with telescope controllers. Plenty are rated for 6V absolute maximum, whereas typical power supplies in astro, e.g. the power tanks, or LiPos are 9V or 12V. Boom. Another $100 when a zener would have saved the day.


A zener costs atleast 2 cents a piece when ordered in bulk. That's 2 ENTIRE CENTS LESS PROFIT!1!


You laugh, but that could be a significant part of the profit for some Chinese peripherals.




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