Various types of LED-based projects are already posted on bestengineeringprojects.com. Now, here is a simple project called LED chaser Circuit using NE555 in which 10 different LED is arranged in a column. The LED arranged in column glow from top to bottom, one at a time.
Description of LED Chaser Circuit Using NE555
The circuit of the LED chaser is designed around a timer IC NE555 (IC1) and decade counter IC CD4017 (IC2). Here, IC1 is used in astable multivibrator mode which generates a clock pulse in a fixed interval of time. The clock from pin 3 of IC1 is given to pin 14 of IC2 which counts each clock pulse and reset after each 10 clock pulse. Only one output out of ten of the decade counter is high i.e. nine outputs are always low. Preset VR1 is used to adjust the clock pulse of IC1.
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PARTS LIST OF LED CHASER CIRCUIT USING NE555
| Resistor (all ¼-watt, ± 5% Carbon) |
| R1, R2 = 1.5 KΩ
VR1 = 100 KΩ |
| Capacitors |
| C1 = 1 µF, 16V (Electrolytic Capacitor)
C2 = 10 µF, 16V (Electrolytic Capacitor) |
| Semiconductors |
| IC1 = NE555 (Timer IC)
IC2 = CD4017 BE (CMOS Decode Counter) LED1 – LED10 |