This is a flashing led lights circuit powered from a 12V DC power supply that uses the well known 555 IC. Flashing lights have many and varied applications in life. They are used as warning lights on highways to increase road safety, as beacons on towers, as advertising signs on shop windows,and so on.
Mechanically operated flashers have a short life and many of them generate lot of electrical interference by sparking at the switch contacts. On the other hand, neon lights are power hungry types.
How does the flashing led lights works
12VDC powered true solid-state circuit of the Jumbo LED flasher presented here is wired around LM555(IC1). This IC workes as a low frequency oscillator, drives 5 to 10mm sized, 4 to 40 Red LEDs through a medium power npn transistor 2N2222 (T1).
LM555 IC is configured in a different style by adding a potential divider at its control terminal (Pin 5) to shift the comparator reference levels either higher or lower than the nominal 1/3, 2/3 levels. User can change the LED flashing rate by adjusting the P1.