Turn on the slide switch, and enjoy the light show from the color
LED (D8). For best eects, place the ber optic tree on the color LED
using the mounting base, and dim the room lights.
Variants:
A. Replace the color LED with the color2 LED (D12). The color2 LED
changes colors more slowly.
B. Replace the color2 LED with the blue LED (D9).
C. Replace the blue LED (D9) with the blink red LED (D11).
D. Replace the blink red LED (D11) with the lamp (L4).
E. Replace the lamp (L4) with the melody IC (U32, “+” on left).
Project 1 START CIRCUIT
1o
Snappy says when you turn on the slide switch, electricity ows
from the batteries, through the color LED and back to the battery
through the switch. If the switch is o, the ow of electricity is
blocked, and the color LED won’t light.
LEDs are light emitting diodes, which convert electrical energy into
light. The color of the light depends on the characteristics of the
material used in them. The color LED actually contains separate red,
green, and blue lights, with a micro-circuit controlling them; the
colors can be combined to produce yellow, cyan, purple, and white.
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