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) once to
make the display show “01”, then press the B
button on the selector to start.
Every few seconds one or more of the following will
happen, randomly changing: the red LED (D1)
lights, the yellow LED (D10) lights, the speaker
plays a tune, the speaker plays a siren, the green
LED (D2) lights, and the U29 LED display shows a
random pattern.
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Project 75
Siren
Arcade (III)
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 73 circuit,
but connect the end of the
black jumper wire to point D
instead of point C. The
sound is different now.
Use any of the five preceding circuits, but turn off
the slide switch (S1) to reset the LED-MC (U29).
Turn on the slide switch; the display on the LED-
MC shows “00”. Press the A button on the selector
(S8) two or three times to increase the ones digit
on the display. When the display shows “02” or
“03”, press the B button on the selector to start.
The circuit works the same, except that it changes
faster (“03” is faster than “02”).
Project 76
Siren
Arcade (IV)
Project 77
Siren
Arcade (V)
Project 78
Fast Siren Arcade
Project 73
Siren Arcade
Use the preceding circuit (no need to reset the
LED-MC), but add a connection between the
points marked B & C using a blue jumper wire.
The sound is different now.
Project 74
Siren Arcade (II)