Led Running Lights from

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

PART LISTS

RESISTORS
R1	6.8k
VR1	100K
R3, R4	220 Ohm

ICs
IC1	Timer 555IC
IC2	1 to 10 Decoder 7493 IC
IC3	1 to 16 decoder 7441 IC
(N1,N2) IC4	IC 7400 – NAND Gate

DIODES
D1 – D16	LEDs

OTHERS
C1	Capacitor 5μ 25 V
C2	Capacitor 0.01μ
BATT	Battery 5 Volt

Circuit Diagram

Led Runing Light 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.