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LEDs By The Dozen
Light emitting diodes. Solid state devices that provide the ubiquitous power and indicator lights on your electronic gadgetry. Unlike lamps, there are no filaments that glow. Rather, some two volts of DC power at a miniscule 10 to 20 milliamps of current get the chemistry excited, and they just plain emit. Emit is a good word, too, as they don't really cast light, but glow brightly. We have a nice assortment of 3 and 5 MM diameter sizes in red, green, orange, and yellow. The longer lead is always positive, the shorter always negative, and you always need a current limiting resistor (about 500 to 1,000 ohms for 5 to 9 volt DC sources) to keep the current in the 10-20 MA range. If that's Greek to you you're either going to blow a lot of LED's or learn to change incandescent indicator lamps ! !
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6796 LED ASSORTMENT |
LEDs And More LEDs
LEDs in assorted colors and sizes for displays, hobbies, robotics, electronics and more.
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12534 4MM 3V LED RED | Red | 4mm Dia. | Details | |
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31632 5MM 3V LED YEL | Yellow | 5 mm | Details | |
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31620 5X3MM 3V LED ORNG | Orange | 5 mm x 3 mm Dia. | Details | |
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31623 9X5MM 6V LED GRN | Green | 9 mm x 5 mm Dia. | Details |
The Sun'll Come Out Tomorrow...
Bet your bottom dollar it will. Be ready for it with this nice solar cell made of glass-enclosed copper indium diselenide. Measures 2-3/8" square x 3/32" thick and is rated for 4.5VDC at 50mA. Has (2) 1" long contact strips for output; the negative strip is marked. Made in the USA.
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37731 4.5 VDC SOLAR CELL |
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Incredible White!
Wow! Really Bright! These are the type of LEDs you see in those ultra–bright key–chain flashlights. White 8mm diameter and operate on 3.5- 4.5 volt, 20% viewing angle, and approx. 5000 MCD. Great for electronics, model trains, miniatures, your own flashlight design.
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93076 WHITE 8MM LED |
Prehistoric Poster
So the poster is really brand new. The animals on it are (1) to (190) million years old, and if that doesn't qualify as pre-history, may we stumble over a glyptodon in the dark. Invicta Plastics Ltd. of Leicester, England, printed this 23" x 16-1/2" poster with a colorful diorama to promote their authentic scale models of prehistoric animals. A time line across the bottom lists dates and data for a dozen of them, from the plesiosaur to the woolly mammoth, and compares their sizes to that of a pair of five-year-old children. Post it on the fridge to spark supper discussions, or in the classroom as a source of extra-credit questions for science quizzes.
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30851 PREHISTORIC POSTER |
LEDs
LEDs for all your needs, 3.5 to 4.5VDC, in 5mm, 8mm and 10mm sizes, (5) to a pack! Super-bright white LEDs, 8,000 to 10,000mcd, for tinkerers (electronics, alarm signals, do-it-yourself flashlights) and hobbyists (model cars, railroads, dollhouses, Christmas villages). UV LEDs, 380NM, to build your own money checkers and other UV scanners. And every size perfect for robotics!
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93911 10MM UV LED'S | |
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93909 5MM UV LED'S | |
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93906 5MM WHITE LED'S | |
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93910 8MM UV LED'S | |
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93907 8MM WHITE LED'S |
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