New power supplies for LEDs. Free Technical Library News

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New power supplies for LEDs

27.04.2007

Mean Well has announced the launch of a new series of LED power supplies - PLN-30. These are case-type AC/DC converters with active power correction function.

They fully comply with the requirements of UL1310 class 2 - under no circumstances will the output power of this series of power supplies exceed 100 VA, and the output current - 5 A. This significantly reduces the risk of electric shock for personnel who install advertising panels and "marquee" systems. on LEDs.

The protection class of the housings of the new converters against dust and moisture allows them to be used both indoors and outdoors. The conversion efficiency is 86%, and the operating ambient temperature is from -30 to +50°C.

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A computer the size of a business card and a millimeter thick 31.12.2019

Embedded systems engineer George Hilliard has created a computer that resembles a business card in size and design. He managed to reduce its cost to a minimum - his creation can be considered almost the cheapest computer in the world.

The computer is only stylized as a business card - Hilliard designed the card and printed it on a full-fledged two-layer printed circuit board. The thickness of the PC varies from 1 mm at the location of the components to 2 mm at the USB connector. This was necessary so that when connected to the USB connector, the computer was firmly held in it.

The cost of a PC business card, according to the engineer himself, does not exceed $2,88. At the same time, it can be used not only as a computer, but also as a USB drive. But still, in terms of its capabilities, Hilliard's brainchild falls short of popular single-board computers, including the Raspberry Pi Zero, which costs a little more - $ 5. On the other hand, in comparison with this model, a business card computer has at least one advantage.

The Raspberry Pi Zero comes without built-in memory, while Hilliard's invention has it, although it is only 8 MB (megabytes). The engineer provided two options for using the PC, and the first of them is the use as an external drive. In this case, it will fit about the same amount of information as can be written on five classic 3,5-inch floppy disks.

The second option is to use it for its intended purpose, that is, as a computer. The invention is based on the Allwinner F1C100s ARM processor, and the choice in favor of it was probably made due to its physical dimensions and capabilities, plus the author did not really want to mess with BGA soldering. A 10x10 mm chip also accommodates a 32-megabyte RAM module, which made it possible to reduce the number of microelectronic elements on a business card.

The computer runs Linux and comes with two Python interpreters. The entire software weighs in at about 2,4 MB and, according to the inventor, the system boots in just 6 seconds.

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