/diy/ - Do It Yourself

any one know of a decent 5v boost board? Iv been through a heap of cheap ebay ones but none of them seem to be able to output anywhere near 500ma. My requirements are fairly simple:
-low input voltage (.5v - 5v)
-atleast 500ma output, preferably upto 2a continuous

pic related is the worst one yet. breaks down at only 100ma output!