Amateur Scientist

Experimenting with Light and Dark SENSORS

Use photoresistors, phototransistors, and photodiodes to make simple, powerful sensors for your projects.

Written by Forrest M. Mims III

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Gunther Kirsch

Time Required: 1–2 Hours

Cost: $10–$30

Easy, inexpensive circuits to give your projects sensitive “electric eyes.”

FORREST M. MIMS III (forrestmims.org), an amateur scientist and Rolex Award winner, was named by Discover magazine as one of the “50 Best Brains in Science.” His books have sold more than 7 million copies.

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Materials

Photoresistors, ...

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