Developed by the Graffiti Research Lab a division of the Eyebeam RandD OpenLab, LED Throwies are an inexpensive way to add color to any ferromagnetic surface in your neighborhood.
A Throwie consists of a lithium battery, a 10mm diffused LED and a rare-earth magnet taped together.
how much current is going thru those leds with the 3 v supply?, i know the use of a resistor complicates things a bit (being such an easy design) i think throwies might survive longer with a current limiting resistor...
LEDs can be operated on AC voltage, but it will only light with positive voltage, causing the LED to turn on and off at the frequency of the AC supply (60 times each second (60 cycle flicker) in North America).
Some LED units contain two diodes, one in each direction (that is, two diodes in inverse parallel) and each a different color (typically red and green), allowing two-color operation or a range of apparent colors to be created by altering the percentage of time the voltage is in each polarity.
The LED chip emits blue light, part of which is converted to yellow by the Ce The single crystal form of Ce :YAG is actually considered a scintillator rather than a phosphor.
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