Owner manual
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122
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White noise is a noise that has a wide frequenc
y
ran
g
e. One kind of white noise is the static noise yo
u
h
ear w
h
en you tune your
FM
ra
di
o to an area w
i
t
h
no station. When you play electronic musica
l
instruments, you can use white noise, a normally
useless noise, as a sound source.
Wh
en you comp
l
ete
b
u
ildi
ng t
hi
s c
i
rcu
i
t, set t
he
switch to position A to turn on the power. Look at th
e
schematic. You will use the noise that is
g
enerate
d
when you apply a reverse volta
g
e to the base an
d
the emitter of transistor Q1.
I
C
1 acts as an oscillator. The output of this oscillato
r
is rectified by diodes D1 and D2, and flows to Q1. IC
2 ampli
f
ies the noise so that you can hear it through
the earphone
.
No
t
es
:
EXPERIMENT #1
0
2: WHITE N
O
I
S
E MAKE
R
W
iring
S
equence
:
64-90-13-EARPH
O
N
E
121-114-112-46-47-70-96-84-85-14-EARPH
O
NE
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S
chemati
c