Led Running Lights

Posted on Feb 5, 2014

The circuit consists of three parts. The first part has an oscillator while the second has mod 16 counter 7493. The oscillator is wired in self-triggered mode, and the potentiometer VR1 is used for speed control of the running lights. That is, frequency can be varied from 21 Hz to less than 1 Hz. The counter outputs A, B and C are decoded by IC3 (t

Led Running Lights
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he decoder 7442) and the outputs obtained on pins 1 to 9 of this IC. The D output of the counter is used for selecting the LEDs from D1 to D8 or D9 to D16. When D is low D1 to D8 are selected, and when D is high D9 to D16 are selected. For the selection of these LEDs, IC4 (7400) NAND gate is used. Thus, a sequential running effect is produced.

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