Data Sheet

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59. Siren & Red Light Warning

Build the circuit shown. Press the

switch (62) and the siren will be heard

from the speaker (93). At the same

time you can see the red light ashing

in the LED (69). The voltage changes at

the speaker input SP2 are changing the

voltage across the LED (69), causing it

to icker.

60. Gun with Flash on Shot

Press the switch (62), then use a nger

and tap the touch plate (80). The sound

of a single gun shot should come from

the speaker (93), and the red light LED

(69) should ash like the ash of a gun.

Hold your nger on the touch plate (80),

and a machine gun sound should come

from the speaker (93) with the red LED

ashing at each shot. This type of a

circuit can be used to synchronize lights

and sounds to create special effects.

61. Fire Siren & Red Light Warning

Press the switch (62) and hold down the press switch (61). The sounds of a re siren will be heard from the speaker (93),

with the red light warning on the LED (69). The IC in the Three-in-One (11) uses AND and NAND (Not AND) gate logic to

make the re engine siren sound when T1 is active AND I/O1 and I/O2 are NOT active.

62. Magnet-controlled Fire Siren with Red Light Warning

Replace the press switch (61) with the reed switch (83) and press the switch (62). Now you can hear the siren from the

speaker (93) with the red light warning on the LED (69). Move the magnet (7) towards the reed switch (83) and now the

re siren is on.

Note: You may need to

twist the LED (69) heart

attachment to clear the

speaker (93) so it ts

properly.

1st level

2nd level