User Manual

Build the circuit as shown, place one of the disco covers on the disco
motor (DM), and turn on the slide switch (S1). Nothing happens. Press
& release one of the buttons on the selector (S8) to start the circuit. To
stop the circuit, push the press switch (S2) to reset it.
Build the circuit as shown and turn the slide switch (S1). Push & release
the press switch (S2), the green LED (D2) flashes once, the red LED
(D1) lights, and the speaker sounds. Set S1 to off to turn off the circuit.
Use the preceding circuit, but
add a 2-snap wire between the
points marked A & B. The
sound is different now.
Use the preceding circuit, but
remove the 2-snap wire between
points A & B, and add a blue
jumper wire between points B &
C. The sound is different now.
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Project 188
Start Stop Ball
Project 189
Sound On by Thyristor
Project 190
Sound On by
Thyristor (II)
Project 191
Sound On by
Thyristor (III)
Disco Cover
SUPPORT BAR