My goal was to replace the PNP 2N3906 in
the PCB w/ A TIP120 Darlington PNP in order to drive 700 mA instead of 300 mA, leaving everything else in the schematic unchanged. But the bigger transistor had a different footprint and handled a larger collector current.
Remove the 5 resistors, and put in an adjustable potentiometer (a trim pot).
Put either end of the trim pot across the USB Power (5V and GND) and trim it until the wiper (center) voltage is 2V.
Connect the wiper of the trim pot to the D+ and D- of the USB connector.
That's it. That's as simple as we can make it!
If you have a 5V source, putting this trim pot on the connector will allow charging the device.
If your source is more than 5V, you will require a regulator, just as before.
Above is the basic schematic and examples of adjustable trim pots.
Have fun charging or running your favorite devices from your favourite alternate sources!
Just remember that 5V regulators produce more and more heat, the more your source is above 5V
I usually don't recommend going above 9V (12V with a GOOD heat sink) into the regulator.
Also don't forget that you WILL get that error message about not being able to charge off your source once your batteries or source voltage drop below a certain point!
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