Five bi-colour LEDs are used in this circuit. These LEDs first light-up from top bottom ingreen colour one by one and then these LEDs light-up from bottom to top in red colour.
|D1-D10||1N4001 × 10|
|L1-L5||Bi Colour LEDs|
As IC1 provides clock pulses to the input of decade counter IC2, at each clock pulse, IC2 counts from 0 to 9.
The first five pulses reach the green anodes of the bi-colour LEDs and they light in green colour. The next five pulses reach the red anodes of the LEDs so they light-up in red colour.
This process is continued regularly. The glowing rate of LEDs can be controlled with the help of potentiometer (VR1).
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