The LM3916 is a monolithic integrated circuit that senses analog voltage levels anddrives ten LEDs, LCDs or vacuum fluorescent displays, providing an electronic version
of the popular VU meter.One pin changes the display from a bar graph to a moving dot display.LED current drive is regulated and programmable, eliminating the need for current
limiting resistors.The whole display system can operate from a single supply as low as 3V or as high as 25V.Search the web for 'LM3916' for lots of info
or copy this address into a new browser window for the datasheet:http://html.alldatasheet.com/html-pdf/838768/TI1/LM3916N-1/56/1/LM3916N-1.html
From Datasheet:
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