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Make: Technology on Your Time Volume 25 by Mark Frauenfelder

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ELECTRONICS: FUN AND FUNDAMENTALS

By Charles Platt

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A Trippy Crystal Nightlight

Create any color, using 3 LEDs and the trick of pulse-width modulation.

image On a shelf above my bed stands something highly unusual: a giant, translucent, crystalline chunk of salt (Figure A), given to me by a friend who imports gemstones from Pakistan.

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Photography and diagrams by Charles Platt

Fig. A: By day, an 8" crystalline chunk of salt.

The salt was drilled with a ...

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