Data Sheet

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212. Making ICs – Step 6
Build the circuit to the left, turn on the switch (62), and you will see all
three LEDs will be on and also the alarm (78) will sound. The sixth step
in making an IC for a circuit like this or more complicated circuits is to
perform packaging. All the chips that pass the testing step are cut out
of the wafer and packaged as discussed in project #206.
213. Siren
Build the circuit shown on the left. Press the switch (62) and you will hear the
siren from the speaker (93). The 3-in-1 (11) contains an Integrated Circuit
(IC) that produces the siren sound. As discussed previously, an IC is a set
of electronic circuits on one small at piece (or “chip”) of semiconductor
material, normally silicon. ICs enable much more complicated circuits to
be designed in orders of magnitude smaller, cheaper, and faster manners
than those constructed using discrete electronic components.
214. Machine Gun Sounds
Place a 4-wire (4) across points C and D in project #213, press the
switch (62) and you will hear a gun shot and machine gun sounds.
Sound technicians use electronics like this on the job to create all types
of sounds.
215. Emergency Fire Siren
Place a 4-wire (4) across points A and B in project #213, press the
switch (62) and you will hear the sound of an emergency re siren. A
siren like this is designed by an engineer to cover a large spectrum of
sound so all people can hear it, even if they have hearing problems.
216. Space Battle Sounds
Place a 4-wire (4) across points E and F in project #213, press the switch
(62) and you will hear space battle sounds. Note the 4-wire (4) on the 3-in-1
(11) in this circuit is activating the space war sounds by grounding the I/O2
pin. In electronics, this type of input is called “active low”.
217. Music
Place a 4-wire (4) across points G and H in project #213, press
the switch (62) and you will hear music. This music is electronically
generated and stored in this module during production and usually
checked by a quality control technician to insure good audio quality.
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