Various types of running or disco light is already available in www.bestengineeringprojects.com . Now here very simple running led light circuit using two transistors.
Circuit Description of LED Running Light Circuit:
The entire circuit of LED running light is designed using two general purpose NPN transistors. The design and working of this circuit is very simple and straight forward. Both of these transistors are configured in astable multivibrator mode.
Initially when no power supply is connected, both the transistor drives to cut off region and none of these LED glow. But when power supply is connected transistor T1 start conducting and transistor T2 still drive to cut off region, LEDs connected to transistor T1 starts glowing. After some time transistor T1 drives to cut off region and transistor T2 start conduction as a result LEDs connected to transistor T2 starts glowing. This entire process repeats after some interval of time.
PARTS LIST OF SIMPLE LED RUNNING LIGHT CIRCUIT
|Resistor (all ¼-watt, ± 5% Carbon)|
|R1, R2 = 56 KΩ
R3, R4 = 150 Ω
|C1, C2 = 10 µF/12V|
|T1, T2 = BC147
LED1 – LED8 = Different color LEDs