Manual

Project 135
Mounted upside down:
Mounted
sideways:
You can enhance the preceding circuit (and the one before
it) by replacing the color LED (D8) with the light tunnel
(U30), as shown. Try to throw the ping pong ball through
the opening between the vertical snap wires.
-70-
Hole Ball with
Light Tunnel
Push and release the press switch
(S2); 9 LEDs (3 red, 3 green, and 3
blue) in the light tunnel (U30) light
while the switch is pressed. Now turn
on the slide switch (S1); the 9 LEDs
go on and off in a repeating pattern.
Project 136
Check the Light Tunnel
This circuit is a simple
check that the light tunnel is
working properly, and is
referenced by the Advanced
Troubleshooting procedure.