Everything works fine as long as I don't activate more than 10 steps (and not choosing too many at the boarder eg. steps 1,2,3 or 14,15,16) and I get the "VU meter display".
Like that the voltage drops down to 4.4v
if i lit all 16 steps it stalls with 4.25v
just checked my PSU: it's a cheap cellphone usb adapter with 1A. too little?