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Build the circuit as shown, place one of the
disco covers on the disco motor (DM).
Turn on the slide switch (S1) and then turn
it off (keep it off). The green LED (D2)
flashes once, the red LED (D1) lights, and
the speaker (SP2) sounds. Push the press
switch (S2) to reset the circuit.
Variants:
1. Change the sound by placing the red
jumper wire between points A & B.
2. Change the sound by placing the red
jumper wire between points B & C.
Turn on the slide switch (S1) and then turn it off. The green LED (D2)
lights while S1 is on. The red LED (D1) stays on and the programmable
fan (M8) spins and displays a message. Push the press switch (S2) and
the circuit stops.
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Project 192
Sound and Light On-
Off Thyristor
Project 193
Fan On-Off
!
WARNING: Moving parts. Do not
touch the fan while it is spinning.
Disco Cover
SUPPORT BAR