Projects from Make: Magazine
High-Power Blinking LED
Make a high-power LED blink as a warning light, a robot eye or whatever else you might need.
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Steps
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Step #1: Materials
1: PCB; 2: Solder; 3: White LEDs; 4: Wire; 5: 10kΩ resistor; 6: Switch (it can be a momentary switch); 7: Battery holder for 4 AA batteries; 8: 10μF Electrolytic capacitor; 9: 555 timer (NE 555).