Here's a great way to control LEDs in a constant current mode using the TLV431 shunt regulator.
http://www.ti.com/product/tlv431
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Watch video How to Drive LEDs - Easy Constant Current Circuit online without registration, duration hours minute second in high quality. This video was added by user Kevin Darrah 25 February 2014, don't forget to share it with your friends and acquaintances, it has been viewed on our site 86,82 once and liked it 1.1 thousand people.