Increasing the voltage involves changing surface mount resistors at R1 and R2.
All the information necessary is in the Over clocking section of AntMiner-U1 user guide.
When I get more time I will try some other voltage & clock experiment's.
Right now I am happy with .9 volt and 300mhz for 2.4gh/s.
yeah my eyes suck so that is not happening.
I read that 0981 would work for a 2.0gh overclock.
do you think the famous pencil mod used on redfury sticks would work?
*Maybe* but you'd want to measure the resistance really well beforehand since it'll be the only path for current across those two points, as opposed to parrallel around an existing connection between two points (like in the Red/Blue Fury). I've done it with my Red Furys, and it worked great - one is quite happy at 3ghs and the other at 2.8ghs, but I'm not sure that I'd try it with these Ant U1s...
Edit to add reference that might help (looks like the resistance could be too high...:
http://tedprints.tedankara.k12.tr/23/1/2009-Gozde%20Nur.pdf