My three-color ring . Dazzling for 2002.
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Three high intensity LEDs (red 8,000 mcd, blue 3,000 mcd, green 14,000 mcd) are flashed at different frequencies although the little battery doesn’t handle the full rated power of the LEDs. It uses 3 x 555 IC’s, 3 capacitors, 6 resistors, a microswitch and the battery.
This is a lot more complicated electronically using 3 discrete IC’s.

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Photo Date:  2002