Elenco Electronics EP-130 - Square Wave Oscillator

-
141
-
Multivibrator oscillators produce square waves, an
d
you can use square waves as test si
g
nals. You should
be familiar with multivibrator circuits from
p
revious
experiments. The name square wave comes from th
e
pattern pro
d
uce
d
b
y t
h
e s
i
gna
l
on an osc
ill
oscop
e
(
shown below
).
Build this circuit and you will hear the sound produce
d
by a square wave si
g
nal. You can di
ff
er the pitch an
d
the frequency of the si
g
nal by modifyin
g
the control
.
This varies the current supplied to the PNP transisto
r
b
ases
.
N
o
t
es:
EXPERIMENT #119: SQUARE WAVE OSCILLATO
R
Schematic
Wiring
S
equence:

77-75-
48
-
2
7-
124

28-81-83

4
0
-1
0
7-
8
4

41-1
06
-7
6

1
19-42-45-80-EARPHONE

4
3
-1
05
-
8
2

7
8
-
8
7-1
08
-44

4
6
-
88

47-79-EARPHON
E

1
21-122