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Technical Support / Re: Power Issues. JuiceBitz Quality Control
« on: May 28, 2019, 09:34:10 pm »
I have made up a small rig comprising a SMD Micro USB socket on a piece of breadboard to allow me to reliably measure the resistance of the cable cores.
I've got five JuiceBitz (All genuine, bought from their Amazon Store) ranging from 0.5 m to 2m in length. Only the shortest one gives the throttling issue.
All the good ones measure a resistance of the Positive lead at between 0.1Ω to 0.19Ω ..The -Ve is even better as it also uses the braid.
The bad one detailed in my first post measures 2Ω. This doesn't sound like a lot, but at 5Volts, with the PI needing to draw around 600mA, this could be knocking the voltage down to 4 volts or less!
I've got five JuiceBitz (All genuine, bought from their Amazon Store) ranging from 0.5 m to 2m in length. Only the shortest one gives the throttling issue.
All the good ones measure a resistance of the Positive lead at between 0.1Ω to 0.19Ω ..The -Ve is even better as it also uses the braid.
The bad one detailed in my first post measures 2Ω. This doesn't sound like a lot, but at 5Volts, with the PI needing to draw around 600mA, this could be knocking the voltage down to 4 volts or less!