Elenco Electronics EP-130 - LED Flasher

-
98-
Be
g
in by slidin
g
the switch to position B and wirin
g
the circuit. This LED flasher uses two diodes. As yo
u
b
u
ild
t
hi
s exper
i
ment,
b
e sure to connect t
h
es
e
diodes in the correct direction
.
When you finish assemblin
g
the experiment, turn on
the power by slidin
g
the switch to position A, an
d
press t
h
e
k
ey.
Th
e
LED
starts
bli
n
ki
ng
i
mme
di
ate
l
y
.
Even i
f
you don’t press the key, this LED
f
lashe
r
starts
f
lashin
g
shortly a
f
ter you turn on the power; i
f
you press the key, it be
g
ins blinkin
g
ri
g
ht away.
This LED
f
lasher uses an o
p
erational am
p
li
f
ier as a
n
astable multivibrator, but its
f
lashing time is muc
h
shorter because o
f
the two diodes.
No
t
es
:
EXPERIMENT #7
9
: LED FLA
S
HE
R
Schematic
W
iring
S
equence:

8
1-31-63-131-13
8

33
-
6
7-
88
-
90
-7
6

68
-11
5
-1
3
7-12
8
-12
5

69
-
8
7-
82
-
84

83
-7
0
-11
6
-121

7
5
-127

89
-12
6

1
1
9
-124

1
22-132