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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 |
Prince Plastic
Sure, when it comes to optical precision, glass is king. But in other categories (price!), plastic is definitely heir to the throne. If you're not looking for precision, but just for some funky lenses for your art project, model or for messing around with light, these 20mm dia PCV lenses will work royally. 6.6mm thick, clear plastic with a -60mm focal length. With (2) 1/8" dia mounting nubs on the side; they should file right off if you don't like them. So let the bluebloods waste their bread on glass; you've got plastic.
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27657 PLASTIC 20MM PCV |
Knobbies
1-7/8" dia. green, brown or orange hard plastic balls with a 1-1/4" ID x 1-1/2" deep hole on one side. Use them as slippery chair feet, as knobs on the ends of levers or tops of canes or even as protective caps for sharp pole ends. The tapered inner veins will provide a tight friction fit. You get an assortment of colors.
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29569 KNOBBY CAPS |
LED Displays
A big grab bag of LED display tiles. Assorted colors - red, green, amber - and displays. Small are 1" x 2" and smaller; 3-9 volts; and include seven-segment numeric, dot matrix, and alphanumeric. Sorry, we can't tell you what size or display you'll get, but Small has at least (4) different. Think of it as a surprise present from Uncle Barry. Hook 'em up and find out what he gave you!
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29233 LED DISPLAYS, SM |
Optical Glass Filters
Al Luebbers, our founder, collected glass. Not glass like you'd find on a knick-knack shelf, but optical glass. Lenses, prisms, reticles and filters, for example. Focus on the filters. Many of his filters came out of military surplus, and this is for-real stuff. We mean many are solid dyed optical glass, ground and polished to flatness standards that were probably excessive. Others are from the old days in photographic optics, and their standards were even tighter than your militaristic Uncle's. We've found that photographers, artists, and optical designers still have an occasional need for good glass filters, so we're making a list of some goodies. As always, don't be timid about calling for quotes on quantities. If we have 'em, we'll sell 'em. Just don't sell them back. Please! If you're just playing, the assortment set may be a better way to go. Can't decide?? New to filters?? Doing a science project on light?? Let us assort (6) different filters of at least 20mm. dia for you.
| DIAM.or SIZE (mm) | CENTER THICK (mm) | |||
|---|---|---|---|---|
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3477 FILTER, AMBER | 26 | 1.5 | |
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3492 FILTER, AMBER | 30 | 2.3 | |
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3480 FILTER, NEUTRAL | 26 | 1.5 | |
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3490 FILTER, NEUTRAL | 30 | 2.3 | |
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3510 FILTER, NEUTRAL | 50x54 | 3.1 | |
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3512 FILTER, NEUTRAL | 67x70 | 4.1 | |
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3458 FILTER, RED | 6 | 1.4 | |
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3464 FILTER, TYPE A | 9 | 1.8 | |
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3470 FILTER, YELLOW | 18x18 | 1.6 | |
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3504 FILTER, YELLOW | 37 | 5.5 |
First Surface Mirrors
Optical imaging folk insist that their reflective surfaces be on top of the glass, because an optically minor “ghost” is created with back surface mirrors. These “First Surface” optical mirrors generally also have better glass and flatter surfaces than their household brethren. Delicate, with the fragile reflective surface exposed, they carry the prices that precision demands. If you are playing with lasers, photography or optical alignment, the first surface items below are what you need. Dimensions are included in the description as width x length x thickness, all in mm.
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69134 FS MIRR., 1.5X1.5X1 | |
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4112 MIRROR, FS, 77 X 194 X 3 |
A Painful Choice
A thumbscrew, if you have an enemy with fat thumbs -- a thumbscrew-style hose clamp, if not. Metal, adjustable between 3/4" and 1-1/2". We suggest that this would be a good time to fix that leaky hose, before your wife starts eyeing your diphalangal digits.
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32715 HOSE CLAMP |
Worth Springing For
No large ones, but (101) amazingly assorted small extension, compression and torsion springs -- most, but not all, 1" to 2" long. Assorted lengths, assorted widths, assorted finishes, asorta handy bag of replacement parts to have around the house.
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92272 101 ASST SPRINGS |
DCX Lens
This nice handful of plastic lenses is just the ticket for a primary-school teacher who needs unbreakable samples, and who wouldn't mind having a few interesting pieces left for craft projects. Each DCX lens is 20mm dia, 34.5mm focal length. Not individually wrapped, so a few may have small surface scratches.
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68093 PLASTIC LENS |
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