This circuit acts as a simple light effects generator. With the LEDs suitably arranged, it will produce the impression of a star and so makes an ideal Christmas ornament or decorative element. As you can see from the board layout, the LEDs have been arranged in the shape of a star.The first LED to light is the centre one. Thenfollow the LEDs in the inner ring (D3-D19), followed by the next ring, and so on, right up to the outer ring (D43-D50). The sequence is then started again. The speed of the light effect depends on the setting of P1.