When I use my tablet on my balcony I would like to have it connected to the charger, but using a long (3m) USB cable seems to drop the voltage so that it doesn't charge.
I am wondering whether I can modify a wall-wart to give (say) 5.5V, thus compensating the voltage drop. I reckon I can open a wall-wart with a hacksaw (and a great deal of care), and later glue/tyrap it shut, but is there any chance of adjusting the voltage when I am inside?
I have an electronics background, can (de)solder regular components (but not SMD), and can use a multimeter. I am also aware that playing silly-buggers with mains voltages carries the death penalty; ie I shan't do anything dangerously stupid. Is it worth my while to spend half an hour opening a wall-wart (obviously a 2A unit so that the available current is sufficient) in the hope of finding a twiddle-pot or a location where I can add a 0.7V diode, or is there an alternative?