Manual

Build the circuit and turn on the switch (S1). Four
devices should be on (light tunnel (U30), white LED
(D6), color LED (D8), and horn (W1)); cover the
phototransistor (Q4) to shut them off. If none of the
devices are on then shine more light on the
phototransistor. You can place the Q4 attachment on
Q4 if you want to make it less sensitive to light.
Remove the horn if you find its sound too annoying.
Variants:
1. Move the end of the red jumper wire from point A
to points, R, G, or B.
2. Place a 2-snap across points R & G, or points G
& B. Move the end of the red jumper wire from
point A to the 2-snap.
You need an infrared remote control for this project, such as any
TV/stereo/DVD remote control in your home.
Use the project 116 circuit but place the Q4 attachment on the
phototransistor (Q4). Position the circuit away from lights in the
room so that the four devices (U30, D6, D8, and W1) are off.
Point your remote control directly into the Q4 attachment, and
press any button to turn on the four devices.
Note that when the phototransistor (Q4) is activated by room
lights the four devices are on continuously, and when the
phototransistor is activated by your infrared remote control the
light tunnel and LEDs wil be blinking and the sound will be erratic.
-65-
Use the preceding circuit but
swap the locations of the
phototransistor (Q4) and 5.1kW
resistor (R3), “+” on Q4 should
be towards U30. Now the four
devices (U30, D6, D8, and W1)
will be on unless there is bright
light on the phototransistor.
Project 117
Light Up the
Night
Project 118 Infrared Control Four
Project 116 Photo Control Four
Here the NPN transistor
(Q2) is used to enable
the phototransistor to
control 4 devices.