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21
Project 14
Sound Maker
Build the circuit and turn on the switch (S1). You hear sound from the speaker.
Adjust the sound using the lever on the adjustable resistor (RV), and by
pushing the press switch (S2).
Note: In rare cases the circuit may not work at all settings on RV. If this
happens, move the RV lever to the side near the strobe IC, turn the slide switch
off and on to reset the circuit, and only move the RV lever over a small range.
The strobe IC (U23) produces an electrical “tone”. The
pitch of the “tone” is adjusted by changing how much
electricity ows into its upper-left snap, using a resistor.
The electrical tone it produces can be used to make sound
using a speaker, or to control the ash rate of an LED.
The color LED will not be changing colors like it does in
other circuits. When the strobe IC (U23) turns the color
LED on and off, it resets the color-control microcircuit in the
color LED. Even your slowest strobe speed is too fast for
the color LED.
Use the preceding circuit, but replace the speaker with the white
LED (D6). Now you have a strobe light! When S2 is pressed, the light may
be blinking so fast that it appears to be on continuously.
Use the preceding circuit, but replace the white LED with the color LED (D8).
Use the preceding circuit but replace the color LED (D8) with the red
LED (D1).
Project 15 Strobe Light
Project 16 Color Strobe Light
Project 17 Red Light Strobe
Project 18 Infrared Detector
You need an infrared remote control for this project, such as any TV/stereo/
DVD remote control in your home.
Build the circuit and turn on the switch (S1). Point your remote control toward
the infrared module (U24) and press any button to activate the red LED (D1).
Sometimes this circuit may activate without a remote control, due to infrared
in sunlight or some room lights. If this happens, try moving to a dark room.
TV remote controls transmit a sequence of
pulses representing the TV model and the
button that was pressed. The U24 infrared
detector is just looking any infrared signal.
Remote
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