Elenco Electronics EP-130 - White Noise Maker

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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

93
-4
8
-1
01

9
4-111-12
7

82
-
88
-
63
-
132
-
126

7
6
-
89
-
65

11
3
-
66
-
8
1-
83

77-
9
1-
6
7-11
0

68-95-9
2

69
-
80
-
8
7-
86

7
8
-7
9

109
-
128
-
125

11
9
-124

122-1
3
1

102-7
5
S
chemati
c