DeepSOICAs simple as it possibly can be. A big 4700uF 25V cap (instead of a battery - lasts days!), a photodiode, a 100k resistor, and that's it! Held together by a piece of scrap PLA 3d-print.
photodiode transducer
A project log for Measuring DVD-RW laser
Scientific approach to figuring out max drive current
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