Sorry, I know that I just posted a question on an AVR project a few days ago, but...
I've been long wanting to design a general-purpose boost driver for lasers, and I decided to have a go at it. After much researching, I decided to base the design off of an LM2621. I don't have much experience with electronics, so I'm not sure whether there is something better to use or whether it will even function.
Anyway, I mainly relied on the application example from the datasheet (http://www.national.com/profile/snip.cgi/openDS=LM2621), except I added a potentiometer for adjustable output.
The idea was to make something compact (thus, use SMD parts) that can boost the voltage from a standard Li-Ion (~3.7 V) to whatever a laser diode would need. Ideally, a constant current driver would be great, but I think what I've made is constant-voltage...
I'm not sure, though. I'm definitely lacking in understanding at this point.
Anyway, I've included the Eagle schematic and PCB images, so if anyone has tips, suggestions, spots a flaw, or knows a better design, it'd be great if you shared.