Running led is a basic applicative circuit whose usage can be modified in such a way that it can form running letters, drawings or characters running by arranging the led in accordance with our wishes.
Running Led circuit scheme :
Component:
- LED
- R1=1K
- R2-R8=220 Ohm
- VR=10K
- C1=10pF
- IC1=555
- IC2=4017
- B1=Battrey 9V
Circuit Explanation:
IC4017 is an IC decade counter that outputs high value (logic 1) alternately with timer term corresponding to timer / clock that goes into the IC, as the clock generator we use IC 555 with asatable base circuit, duration of this clock / timer can we set by rotating the variable resistor.