ELECTRONIC
PLAYGROUND
MODEL EP-130
and LEARNING CENTER
TM
Copyright © 2015, 2009 by Elenco
®
Electronics, Inc. All rights reserved.
ELENCO
Wheeling, IL, USA
®
No part of this book shall be reproduced by any means; electronic, photocopying, or otherwise without written permission from the publisher.
REV-C
Revised 2015
753039
WARNING: Always check your wiring before
turning on a circuit. Never leave a circuit
unattended while the batteries are installed.
Never connect additional batteries or any
other power sources to your circuits.
Important:
If you encounter any problems with this kit,
DO NOT RETURN TO RETAILER.
Call toll-free (800) 533-
2441 or e-mail us at: help@elenco.com. Customer Service • 150 Carpenter Ave. • Wheeling, IL 60090 U.S.A.
Batteries:
• Do not short circuit the battery
terminals.
Before We Begin
Installing the Batteries
Making Wire Connections
Components
Building Your First Project
Troubleshooting
Helpful Suggestions
TABLE OF CONTENTS
Conforms to all applicable U.S. government
requirements.
!
WARNING:
CHOKING HAZARD
- Small parts.
Not for children under 3 years.
• Never throw batteries in a fire or
attempt to open its outer casing.
• Insert batteries with correct polarity.
• Use only 1.5V “AA” type, alkaline
batteries (not included).
• Non-rechargeable batteries should not
be recharged. Rechargeable batteries
should only be charged under adult
supervision, and should not be
recharged while in the product.
• Do not mix old and new batteries.
• Remove batteries when they are used
up.
• Do not mix alkaline, standard (carbon-
zinc), or rechargeable (nickel-
cadmium) batteries.
• Batteries are harmful if swallowed, so
keep away from small children.
I. PLAYGROUND OF ELECTRONIC CIRCUITS
1. Woodpecker
2. Police Siren
3. Metronome
4. Grandfather Clock
5. Harp
6. Tweeting Bird
7. Meowing Cat
8. Calling’ Fish
9. Strobe Light
10. Sound Effects for Horror Movies
11. Machine Gun Oscillator
12. Motorcycle Mania
13. Vision Test
14. Patrol Car Siren
Page 4
4
5
5
9
10
10
12
13
14
15
16
17
18
19
20
21
22
23
24
25
27
28
29
30
31
32
33
34
35
26
11
III. LED DISPLAY CIRCUITS
23.
24.
25.
26.
27.
28.
29.
30.
31.
32.
33.
IV. WELCOME TO DIGITAL CIRCUITS
LED Display Basics
37
Digital Display Circuit for the Seven-Segment LED 38
LED Display with CdS and Transistor
39
Switching the LED Display Using Transistor Control 40
“Flip-Flop” Transistor Circuit
42
“Toggle Flip-Flop” Transistor
43
“AND” Diode Transistor Logic with LED Display 44
“OR” DTL Circuit with Display
45
“NAND” DTL Circuit with Display
46
“NOR” Transistor Circuit with Display
47
“Exclusive OR” DTL Circuit
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
41
36
V. MORE FUN WITH DIGITAL CIRCUITS
34.
35.
36.
37.
38.
39.
40.
41.
42.
43.
44.
45.
46.
47.
A MAJOR CHANGE
15. Dimming the Light
16. Flip Flopping
17. Capacitor Discharge Flash
18. Transistor Action
19. Series and Parallel Capacitors
20. Transistor Switching
21. Series and Parallel Resistors
22. Amplify the Sound
II. BASIC ELECTRONICS CIRCUITS
“BUFFER” GATE using TTL
“INVERTER” GATE using TTL
“AND” GATE using TTL
“OR” GATE using TTL
“R-S Flip-Flop” using TTL
“Triple-Input AND” Gate using TTL
“AND” Enable Circuit using TTL
“NAND” Enable Circuit using TTL
“NOR” Enable Circuit using TTL
“NAND” Gate Making a Toggle Flip-Flop
“Exclusive OR” GATE using TTL
“OR” Enable Circuit using TTL
Line Selector using TTL
Data Selector using TTL
-2-
VI. MEET TRANSISTOR-TRANSISTOR LOGIC
48. Blinking LEDs
49. Machine Sound
50. Astable Multivibrator Using TTL
51. Tone Generator
52. Monster Mouth
53. Dark Shooting
54. A One-Shot TTL
55. Transistor Timer Using TTL
56. LED Buzzing
57. Another LED Buzzing
58. Set/Reset Buzzer
59. Another Set/Reset Buzzer
64
VII. OSCILLATOR APPLICATION CIRCUITS
60. Ode to the Pencil Lead Organ
61. Double-Transistor Oscillator
62. Decimal Point Strobe Light
63. “The Early Bird Gets the Worm”
64. Adjustable R-C Oscillator
65. Heat-Sensitive Oscillator
66. Pulse Alarm
67. Pushing & Pulling Oscillator
68. Slow Shut-off Oscillator
69. Electronic Organ Detector
77
65
66
67
68
69
70
71
72
73
74
75
76
78
79
80
81
82
83
84
85
86
87
IX. MORE FUN WITH OPERATIONAL AMPLIFIERS
97. Voice Power Meter
98. Reset Circuit
99. RC Delay Timer
100. Listen To Alternating Current
101. Pulse Frequency Multiplier
102. White Noise Maker
103. Light-Controlled Sound
104. DC-DC Converter
105. Super Sound Alarm
106. Op Amp Three-Input “AND” Gate
107. Timer
108. Cooking Timer
93.
94.
95.
96.
LED Initials
Wake Up Siren
Voice Activated LED
Logic Tester
X. RADIO AND COMMUNICATION CIRCUITS
VIII. MEET THE OPERATIONAL AMPLIFIER
70. Operational Amplifier Comparator
71. Changing Input Voltage
72. Non-inverting Dual Supply Op Amp
73. Inverting Dual Supply Op Amp
74. Non-inverting Amplifier
75. Dual-Supply Differential Amplifier
76. Miller Integrating Circuit
77. Stable-Current Source
78. Operational Amplifier Blinking LED
79. LED Flasher
80. Double LED Blinker
81. Single Flash Light
82. Introducing the Schmitt Trigger
83. Initials on LED Display
84. Logic Testing Circuit
85. Voice-Controlled LED
86. Buzzing’ with the Op Amp
87. Sweep Oscillator
88. Falling Bomb
89. Alert Siren
90. Crisis Siren
91. Op Amp Metronome
92. Burglar Buzzer
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
88
XI. TEST AND MEASUREMENT CIRCUITS
109. Operational Amplifier AM Radio
110. AM Code Transmitter
111. AM Radio Station
112. Crystal Set Radio
113. Two-Transistor Radio
114. Morse Code Oscillator With Tone Control
129
117
118
119
120
121
122
123
124
125
126
127
128
116
112
113
114
115
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
-3-
METRIC UNITS AND CONVERSIONS
IDENTIFYING RESISTOR VALUES
IDENTIFYING CAPACITOR VALUES
DEFINITION OF TERMS
PARTS LIST
INDEX
115. Water Level Warning
116. Water Level Alarm
117. Audio Signal Hunter
118. RF Signal Tracer
119. Square Wave Oscillator
120. Sawtooth Oscillator
121. Audio Continuity Tester
122. Audio Rain Detector
123. Audio Metal Detector
124. Water Level Buzzer
125. Pule Tone Generator
126. Resistance Tester
127. Transistor Tester
128. Sine Wave Oscillator
129. Sine Wave Oscillator With Low Distortion
130. Twin-T Oscillator
159
159
156
159
155
BEFORE YOU START THE FUN!
Each electronic component in the kit is connected to
springs, so you can do all the circuit assembly
without having to solder. To build a working project,
all you have to do is connect the wires to the
terminals as shown in each wiring sequence. There
is no danger when doing these projects because you
are using low voltage batteries, not the standard AC
voltages.
As you go through this manual and do the
experiments, you will notice that we have arranged
the experiments, as well as information, into a logical
progression. We will start off with easy circuits and
then work toward the more intricate ones. Take your
time and be sure to have some fun!
Welcome to the thrilling world of electronics! Now
that you have your Elenco
®
EP-130 Electronic
Playground Kit, you can learn about electronics while
doing 130 fun experiments. In this kit we have
included everything you will need to start off on this
electronics adventure, well except the batteries that
is
J.
As you will notice we refer to a
Volt / Ohm Meter
(VOM) for making measurements. A VOM or
multimeter is a instrument that measures voltage,
current (amperes or amps), and resistance (ohms-
W).
You will learn more about these in the upcoming
pages. If you really want to learn about electronic
circuits, it is vital that you learn how to measure
circuit values - for only then will you really
understand electronic circuitry.
You do not have to have or use a VOM to do the
experiments but you will find that it helps to better
grasp how the circuits work. The VOM is a good
investment if you plan to stay interested in electricity
and electronics.
Our simple instructions will show you how to operate
the circuit for each experiment. A
schematic
diagram
is also included, to help you learn how the circuit
works. A
schematic
is simply a blueprint that shows
how different parts are wired together. An image or
symbols for each of the components in your kit are
printed next to each piece.
INSTALLATION OF BATTERIES
This kit requires six (6) “AA” batteries. To install the
batteries to the back of your kit make sure to install
them in the corresponding compartments. Put the +
end and the – end correctly into the kit, the + end for
the battery is the side that has the metal cap.
–
Remember:
Never leave a dying battery or dead
+
+
–
–
–
+
+
+
–
–
+
battery in your kit. Even if they are “leak-proof”, they
still have the potential to leak damaging chemicals.
–
+
+
–
–
–
+
+
+
–
–
+
-4-
WIRING CONNECTIONS
Provided in your kit are spring terminals and pre-cut
wires, make the wires snap together for your use in
the numerous projects. To join a wire to a spring
terminal, just directly bend the spring over to one
side and then install the wire into the opening.
Only insert the exposed or shiny part of the wire into
the spring terminal. The electrical connection will not
be made if the plastic part of the wire is inserted into
the terminal. Removing the wire from the spring
terminals is simply just bending each terminal and
then pulling the wires out of it.
When you have to join to two or three wires into a
single spring terminal, be sure that the first wire does
not come loose when you attach the second and
third wires. The simplest way to do this is to place the
spring onto the opposing side where you have
connected the first wire.
If the exposed metal ends of some of the wires break
off due to great use, you should just simply remove
3/8” if the insulation from the wire of the broken end
and then simply twist the strands together. To
remove the installation you can use either a wire-
stripper tool or a simple penknife. Be extremely
careful when doing this because penknives are
remarkably sharp.
COMPONENTS
This kit has more than 30 distinct components. If this
happens to be your first time with electronics don’t
fret over not knowing the difference between a
resistor or a transistor, because the general purpose
of each component will be described. The following
explanations will help you comprehend what each
component does and you will also gain more
knowledge of each component as you do each
experiment. There is also a parts list in the back of
this manual, that way you can compare the parts in
your kit with those recorded in the back.
-5-
Resistors:
Why is the water pipe that goes to the
kitchen faucet in your house smaller than the one
from the water company? And why is the pipe
smaller than the main water line that disburses the
water to your entire town? Because you don’t need a
lot of water. The pipe size controls the water flow to
what you really need. Electricity works in the same
manner, except that the wires have a minimal
resistance that they would have to be particularly thin
to limit the electricity flow. They would be solid
enough to handle and break effortlessly. However,
the flow of water through a large pipe could be
restricted to by filling a part of the pipe with rocks (a
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