Jumbo LED flashers

Application: This is a flashing led lights circuit powered from a 12VDC 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. Principle of working: 12VDC powered true solid-state circuit of the Jumbo LED flasher presented here is wired around 555 timer. 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 Potentiometet

published 11 years ago