indicator in vehicles
The project here is developed using 555 timer. The timer is wired in astable mode. Now if the power supply is first connected to astable circuit then initially the timing capacitor C1 is discharged. The voltage at pin2 is 0V and the output of timer is driven HIGH. Now C1 starts charging through R1 and R2. Capacitor C1 is also connected to pin6 which is threshold input of the timer.