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[–] 4 points 8 months ago (2 children)

The trick is to put a tiny dummy load on the USB charger. Just buy the cheapest USB cable, cut the end off, and solder (or twist) a resistor between red and black. Boom.

Had a whiny USB power strip at my office desk that stopped whining when my phone was plugged in. Small resistor took care of that perfectly, cheaply, and nondestructively. Got a kick out of confused colleagues asking why I had a dangly cable plugged in with nothing but electrical tape on the end.

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  • [–] 1 point 8 months ago (1 child)

    What are we talking here when you say "small". 20 ohm? 50 ohm?

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  • [–] 2 points 8 months ago

    USB is 5V so I suppose a 10 mA draw (500 ohm resistor) would be sufficient. 20ohm would be 250 mA/1.25W which is certainly overkill for a dummy load. I don't recall exact values but mine barely needed any load to shut up.

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