Led Running Lights

This department is working 100% and was successfully try it myself

Led Running Lights

If you are looking for the miniature running LEDs light then here you can get one. The circuit  in this site is is using the timer 555 1 to 10 decoder 7493 and 1 to 16 decoder 7441.


R1 6.8k
VR1 100K
R2, R3 220 Ohm
IC1 Timer 555IC
IC2 1 to 10 Decoder 7493  IC
IC3 1 to 16 decoder  7442 IC
(N1,N2) IC4  IC 7400  – NAND Gate
D1 – D16 LEDs
C1 Capacitor  5μ 25 V
C2 Capacitor  0.01μ
BATT Battery 5 Volt


 Circuit Diagram

 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 (the 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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