User Manual

Turn on the slide switch (S1); the display on the LED-MC (U29) shows
“00”, and you hear a siren. Press the A button on the selector (S8) to
increase the ones digit on the display, and press the C button on the
selector to increase the tens digit on the display. When the display
shows “21”, press the B button on the selector to start.
Strange sounds will be heard on the speaker (SP2), and the red LED
(D1) changes in sync with the sound.
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Project 57
Funky Siren & Light
Project 58
Funky Siren
& Light (II)
Use the preceding circuit, but add
a connection between the points
marked B & C using a jumper
wire. The sound is different now.
Use the preceding circuit, but
remove the connection between B
& C, and add a connection
between C & D. The sound is
different now.
Use the preceding circuit, but
remove the connection between C
& D, and add a connection
between A & D. The sound is
different now.
Use the project 57 circuit, but
connect the end of the black
jumper wire to point D instead of
point C. The sound is different
now.
Project 59
Funky Siren
& Light (III)
Project 60
Funky Siren
& Light (IV)
Project 61
Funky Siren
& Light (V)
The sound is not as loud as in
project 52, because the red LED
is in series with the speaker,
reducing the voltage to it.