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This is a board designed for [opto-isolation](http://en.wikipedia.org/wiki/Opto-isolator). This board is helpful for connecti…
The SparkFun Beginner Parts Kit is a small container of frequently used parts that gives you all of the basic components you…
The SparkFun Discrete Semiconductor Kit addresses your needs of only needing one or a couple transistors without you needing …
These are very common, high quality BJT NPN transistors made by ST Micro.
The TLP290-4 is an optoisolator transistor from Toshiba.