Applied Science
Experimenting with a liquid lens and driver IC (2011x39)
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This is a project that I built a few years ago when I learned about liquid lenses. They are quite useful for optical paths with small diameters.
http://www.supertex.com/pdf/datasheets/HV892.pdf
http://varioptic.com/en/products.html
http://benkrasnow.blogspot.com/2009/07/experimenting-with-liquid-lens.html