Project 110
Alarm Circuit
Build the circuit shown. When you
turn on
the slide switch
(S1), the integrated circuit (U2) should start sounding a very
loud alarm sound. This integrated circuit is designed to
sweep through all the frequencies so even hard of hearing
people can be warned by the alarm.
Project 114 Quieter Alarm Circuits
Use the project 107 circuit, but add
the 100W resistor (R1) in series with
the speaker (SP2), as shown. Now
the circuit is not as loud.
A B C
D
Project 111
Machine
Gun
Use the
preceding
circuit, but add a
connection between
the points marked B
& C using a 1-snap
and a 2-snap. Now it
sounds like a
machine gun.
Project
112
Fire En
gine
Use the
preceding
circuit, but remove
the connection
between B & C, and
add a connection
between A & B. Now
it sounds like a fire
engine
Project 113
European
Siren
Use the
preceding
circuit, but remove
the connection
between A & B, and
add a connection
between A & D. Now
it sounds like a
European siren.
Project 115
Quieter
Machine
Gun
Use the
preceding
circuit, but add a
connection between
the points marked B
& C using a 1-snap
and a 2-snap. Now it
sounds like a
machine gun.
Project 116
Quieter Fire
Engine
Use the
preceding
circuit, but remove
the connection
between B & C, and
add a connection
between A & B. Now
it sounds like a fire
engine
Project 117
Quieter
European
Siren
Use the
preceding
circuit, but remove
the connection
between A & B, and
add a connection
between A & D. Now
it sounds like a
European siren.
A
B
C
D
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