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COMPARATOR_LED_FLASHER

2017-02-05 03:01  
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COMPARATOR_LED_FLASHER
One section of LM339 quad comparator drives two RS2016 NPN transistors having LED load, to give simple flasher for classroom demonstrations. Circuit can be duplicated with other three sections to give four flashers. Connecting R2 to pin 1 of IC gives conventional ON/OFF flash cycle in which LED tums on and off rapidly. Connecting R2 to pin 6 makes LED tum on rapidly and tum off very slowly. C1 controls flash interval; typical value is 0.01 μF.-F. M. Mims, Integrated Circuit Projects, Vol. 5, Radio Shack, Fort Worth, TX, 1977, 2nd Ed., p 45-51.