Kód: 16882372
"The Amazing 2000-Hour Flashlight" shows how to add a 30-cent resistor to a $5 flashlight and create a light that produces useful illumination for 2000 hours on the same battery. Detailed instructions. 54 illustrations. A half-hou ... celý popis
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"The Amazing 2000-Hour Flashlight" shows how to add a 30-cent resistor to a $5 flashlight and create a light that produces useful illumination for 2000 hours on the same battery. Detailed instructions. 54 illustrations. A half-hour project. No soldering re
8.29 €
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