CONTENTS

130-in-1

Model MX-906

Before We Begin

Installing Batteries

Making Wiring Connections

Components

Building Your First Project

Troubleshooting

Helpful Suggestions

1) Entertainment Circuits

1. Electronic Woodpecker

2. The Chirping Bird

3. Electronic Cat

4. Sonic Fish Caller

5. Machine Gun Pulse Oscillator

6. Electronic Motorcycle

7. Two-Tone Patrol Car Siren

8. Electronic Siren

9. Electronic Metronome

10. Electronic Grandfather Clock

11. Light-Controlled Electronic Harp

12. Horror Movie Sound Effects

13. Strobe Light

14. Rapid LED Display Switching (Persistence of Vision Test)

2) Basic Semiconductor and Components Circuits

A Big Change

15. Capacitor Discharge / High Voltage Generator

16. Capacitors in Series and Parallel

17. Resistors in Series and Parallel

18. Light Dimmer

19. Transistor Switcher

20. Transistor Circuit Action

21. Sound Amplifier

22. Flip-Flop Multivibrator with LED Display

28

33

34

35

36

37

29

30

31

32

13

22

23

24

25

26

27

18

19

20

21

14

15

16

17

11

12

12

6

7

5

5

3) LED Digital Display Circuits

23. Seven-Segment LED Digital Display Circuit

24. Basic LED Display

25. Transistor Control Switching of the LED Display

26. Transistor, CDS Cell and LED Display Circuit

4) A Tour Through Digital Circuits

27. Diode-Transistor Logic AND with LED Display

28. DTL OR Circuit with LED Display

29. DTL NAND Circuit with LED Display

30. DTL Exclusive OR Circuit

31. Transistor NOR Circuit with LED Display

32. Transistor Flip-Flop Circuit

33. Transistor Toggle Flip-Flop

5) More Adventures with Digital Circuits

34. Transistor-Transistor Logic Buffer Gate

35. TTL Inverter Gate

36. TTL AND Gate

37. TTL OR Gate

38. TTL Exclusive OR Gate

39. TTL NOR Gate

40. TTL Three-Input AND Gate

41. TTL AND Enable Circuit

42. TTL OR Enable Circuit

43. TTL NAND Enable Circuit

44. TTL R-S Flip-Flop

45. Toggle Flip-Flop Circuit Made from NAND Gate

46. TTL Line Selector

47. TTL Data Selector

6) The World of Transistor-Transistor Logic

48. TTL Astable Multivibrator

49. TTL Tone Generator

50. Winking LEDs

51. A One-Shot TTL

52. Transistor Timer with TTL

53. Buzzin’ LED

54. Son of Buzzin’ LED

55. Set/Reset Buzzer 1

56. Set/Reset Buzzer 2

57. Sound Machine

58. Big Mouth

59. Shot in the Dark

43

44

45

46

47

48

49

50

38

39

40

41

42

51

60

61

62

63

64

65

56

57

58

59

52

53

54

55

66

71

72

73

74

67

68

69

70

75

76

77

78

7) Application Circuits Based on the Oscillator

60. Variable R-C Oscillator

61. Oscillator with Turn-Off Delay

62. Temperature-Sensitive Audio Oscillator

63. Two-Transistor, Directly Connected Oscillator

64. Push/Pull Square Wave Oscillator

65. Pencil Lead Organ

66. LED Strobe Light

67. Electronic Organ

68. Daylight Early Bird

69. Intermittent Alarm Generator

8) Basic Operational Amplifier Circuits

70. Comparator

71. Basic Increase in DC Voltage

72. Constant-Current Source

73. Integrating Circuit

74. Schmitt Trigger Circuit

75. Noninverting Two-Power Supply Amplifier

76. Inverting Two-Power Supply Amplifier

77. Noninverting Single-Power Supply Amplifier

78. Two-Power Supply Differential Amplifier

79. Tone Mixing Amplifier

80. Power Amplifier Using Operational Amplifier

81. Voltage Controlled Oscillator Circuit

82. Operational Amplifier Buzzer

83. Burglar Alarm

84. Hand-Operated Sweep Oscillator

85. Falling Bomb Sound

86. Emergency Siren

87. First Aid Siren

88. Musical Tempo Generaror

89. Operational Amplifier Winking LED

90. LED Flashing Light

91. Two-LED Winker

92. One Shot Light

93. LED Initials

94. Wake Up Siren

95. Voice-Activated LED

96. Logic Tester

90

107

108

109

110

111

112

113

114

115

116

117

99

100

101

102

103

104

105

106

95

96

97

98

91

92

93

94

79

84

85

86

87

80

81

82

83

88

89

9) More Adventures with Operational Amplifiers

97. Alternating Current Sound

98. Light Control Sound Circuit

99. Sound Alarm Circuit

100. Study Timer

101. Kitchen Timer

102. Three-Input AND Gate Using Operational Amplifier

103. Voice Level Meter

104. Power-On Reset Circuit

105. Delayed Timer

106. Pulse Frequency Doubler

107. White Noise Generator

108. DC-DC Converter with Operational Amplifier

10) Communication Circuits

109. Code Practice Oscillator with Tone Control

110. Crystal Set Radio (Simple-Diode Radio)

111. Two-Transistor Radio

112. Wireless Code Transmitter

113. AM Radio Station

114. Operational Amplifier Radio

11) Testing and Measuring Circuits

115. Aural Continuity Tester

116. Conductivity Tester

117. Transistor Checker

118. Sinewave Audio Oscillator

119. Low Distortion Sinewave Oscillator

120. Twin-T Audio Oscillator

121. Pulse Oscillator Tone Generator

122. Audio Signal Tracer

123. Radio Frequency Signal Tracer

124. Square Wave Audio Oscillator

125. Sawtooth Wave Oscillator

126. Rain Detector

127. Water Level Buzzer with Operational Amplifier

128. Metal Detector

129. Water Level Alarm

130. Three-Step Water Level Indicator

Index

Parts List

138

147

148

149

150

151

152

153

154

139

140

141

142

143

144

145

146

131

132

133

134

135

136

137

118

119

120

121

122

123

124

125

126

127

128

129

130

155

157