Make: Technology on Your Time Volume 35

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PROJECTS ELECTRONICS: FUN & FUNDAMENTALS

The Chronophotonic Lamp Switcher

Written by Charles Platt

TIME: 2–3 HOURS COST: $20–$30

MATERIALS

» Quad comparator IC chip such as STMicroelectronics LM339N

» Phototransistor, visible spectrum RadioShack 55053303

» Trimmer potentiometers, 500kΩ (2) such as Bourns 3386F-1-504LF

» 555 timer IC chips (2) such as Texas Instruments NE555N

» Ceramic capacitors: 1μF (5), 0.1μF (3)

» Relay, SPST or SPDT, 3VDC coil, ...

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