In the kit LED based running display creates an eye-catching running display effect using LEDs. It can be used to light up borders of animations, pictures, etc, and also for short word displays.
In the kit led based running display uses IC NE555 and a popular decade counter IC CD4017. This display consists of 16 LED’s of four layers. The NE555 is wired as an astable multivibrator whose output triggers CD4017 counter. On powering up the circuit, timer starts oscillates to produce triggering pulses. This pulses trigger counters IC 4017 and it counts from 0 to 5. These outputs are fed to general purpose NPN transistors BC547 which are used as current drivers for each led layer. As each of the counter output goes high, the corresponding led layer glows sequentially. After it counts up to 4 values it resets to zero and the process repeats.