another solution to charge and run the tu-05:
while you can not use this solution to run the tu-05 connected to an usb port, this solution itself is complete and provides additional battery power for the tu-05.
for this solution you need an usb battey pack with additional 12v output like this one i am using:
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it provides two USB 5v 2100mA outputs and in addition an output with 9v or 12v 2100 mA and comes with lots of adapters. it can be charged while beeing used.
the 12v output is what is needed for the tu-05 car charger.
i think this is a similar one that can be found on amazon:
the easiest solution is to connect a fitting connector instead of the car connector that is provided with the car charger or as i did to have everything somewhat smaller, to extract the car charger pcb board and mount it using a new, smaller case:
here you see the car charger internal pcb board:
in general it is enough to provide a new input connector that fits the output jack of the usb power pack:
i used some red shrink-on tube to visually see that this is the input connector.
as i had no small case i made one out of a piece of plastic (tupperware):
here you see the pcb mounted with some superglue around the led and the cables:
case closed with superglue:
and here with some strong tape around (of course looking somewhat improvised):
this is the complete set to charge and run both the external usb power pack and the tu-05:
so while it is not possible to directly run and charge the tu-05 with usb power, i think it nevertheless is very usefull as it provides additional power for the tu-05 when on the road, you can not only charge and run the tu-05 but also your mobile phone, tablet and any device with usb, 9v or 12v input, it's real portable (and much easier to modify only the car charger than building the usb charger interface i posted before).
Short note: be very careful and check the right polarity of the new connectors. btw, i have tested everthing and it works!