4017 Led Pattern-Flasher

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The circuit uses a 555 timer oscillator to supply clock pulses of a variable frequency to the 4017 decade counter. The decade counter only needs to have three outputs so the fourth output goes into the reset pin to start the cycle all over again. The central red led is always on. Each row of four leds flash in sequence giving the impression that the light is rotating. It is an idea that works very well giving an eye-catching display. It will run continuously for three hours with a standard pp3 battery.

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This entry was posted on Thursday, April 24th, 2008 at 8:44 am and is filed under 555, LED Flasher, Lighting. You can follow any responses to this entry through the RSS 2.0 feed.