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Adafruit Industries is an open-source hardware company based in New York, United States. It was founded by Limor Fried in 2005. [ 3 ] The company designs, manufactures and sells electronics products , electronics components, tools, and accessories.
Craigslist headquarters in the Inner Sunset District of San Francisco prior to 2010. The site serves more than 20 billion [17] page views per month, putting it in 72nd place overall among websites worldwide and 11th place overall among websites in the United States (per Alexa.com on June 28, 2016), with more than 49.4 million unique monthly visitors in the United States alone (per Compete.com ...
LED tubes. LED tube is a type of LED lamp used in fluorescent tube luminaires with G5 and G13 bases to replace traditional fluorescent tubes. [1] As compared to fluorescent tubes, the most important advantages of LED tubes are energy efficiency and long service life. LED tubes are sometimes also referred to as ‘LED fluorescent tubes’.
Simple LED (Light Emitting Diode) circuit diagram. In electronics, an LED circuit or LED driver is an electrical circuit used to power a light-emitting diode (LED). The circuit must provide sufficient current to light the LED at the required brightness, but must limit the current to prevent damaging the LED.
Newmark launched craigslist.org in 1996, where people could exchange information, mostly without charge. [12] It started as a newsletter about San Francisco events. [ 14 ] He operated it as a hobby while continuing to work as a software engineer until 1999 when he incorporated Craigslist as a private for-profit company. [ 15 ]
The tube is then sealed at the desired length using a carbon dioxide laser. Borosilicate is preferred for its strength and resistance to breakage. In the tube, the tritium gives off a steady stream of electrons due to β decay. These particles excite the phosphor, causing it to emit a low, steady glow.
Many more tube ratings exist, often country-specific. The Nominal Length may not exactly match any measured dimension of the tube. For some tube sizes, the nominal length (in feet) is the required spacing between centers of the lighting fixtures to create a continuous run, so the tubes are a little shorter than the nominal length.
This allows the display tubes to be multiplexed, simplifying the interface circuitry. [4] The German tube manufacturer Telefunken tried to sell an unlicensed copy of the design under the type number XM1000, [5] but was sued by IEE in 1969 and lost, having to destroy all tubes already produced. Only a few survived, most of them not yet labeled.
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