1. PC-Based Oscilloscope

2. Infrared Toy Car Motor Controller

3. Long-Range FM Transmitter

4. Electronic Security System

5. House Security System

6. FM Booster

7. IR Remote Switch

8. Clap Switch

9. Electrical Equipment Control Using PC

10. Water-Level Controller

11. LED-Based Message Display

12. Laser Torch-Based Voice Transmitter And Receiver

13. Automated Traffic Signal Controller

14. Telephone Receiver

15. Ultra-Bright LED Lamp

16. Quality FM Transmitter

17. Invisible Broken Wire Detector

18. Remote Control For Home Appliances

19. Infrared Cordless Headphone

20. Ding-Dong Bell

21. DTMF Proximity Detector

22. 9-Line Telephone Sharer

23. Condenser Mic Audio Amplifier

24. Mobile Phone Battery Charger

25. Knock Alarm

26. Mobile Cellphone Charger

27. 15-Step Digital Power Supply

28. Telephone Number Display

29. Lead-Acid Battery Charger With Voltage Analyser

30. Water-Level Controller

31. DTMF Receiver IC MT8870 Tester

32. Automatic Night Lamp With Morning Alarm

33. Musical ‘Touch’ Bell

34. Charge Monitor For 12V Rechargeable Lead-Acid Battery

35. PC-Based DC Motor Speed Controller

36. Infrared Remote Control Timer

37. Touch Dimmer

38. Cell-Phone-Controlled Audio/Video Mute Switch

39. Intruder Radio Alert System

40. Programmable Timer for Appliances

41. Automatic Heat Detector

42. Electronic Card-Lock System

43. Electronic Motor Starter

44. Three-Colour Display Using Bicolour LEDs

45. Electronic Watchdog

46. Fastest Finger First Indicator

47. Simple Code Lock

48. Anti-Theft Alarm For Bikes

49. Remote-Operated Musical Bell

50. Anti-Theft Security For Car Audios

51. Teleremote Control

52. Washing Machine Motor Controller

53. Flashing Beacon

54. Shortwave Transmitter

55. Simple Telephone Ring Tone Generator

56. Automatic Speed-Controller For Fans and Coolers

57. Pulse Generator

58. Digital Mains Voltage Indicator

59. Parallel Telephone With Secrecy and Call Prevention

60. Electronic Jam

61. Digital Stop Watch

62. Low-Cost Hearing Aid

63. Power-Supply Failure Alarm

64. Child's Lamp

65. Audio Amplifier for Personal Stereo

66. Computerised Universal Timer

67. Auto Turn-Off Battery Charger

68. Song Number Display

69. Solar Lighting System

70. CD-ROM Drive As Digital-Audio CD-Player

71. Simple Digital Security System

72. Remote-Controlled Power-Off Switch

73. IC Controlled Emergency Light With Charger

74. Remote-Controlled Fan Regulator

75. Music On-Hold For Telephones

76. Luggage Security System

77. Precision Amplifier With Digital Control

78. Stereo Tape Head Preamplifier For PC Sound Card

79. Over-/Under-Voltage Protection of Electrical Appliances

80. DarkRoom Timer

81. Simple Low-Cost Digital Code Lock

82. Telephone Conversation Recorder

83. DC Motor Control Using A Single Switch

84. Hit Switch

85. Mains Manager

86. Watchman Watcher

87. Versatile Zener Diode Tester

88. Low-Cost PCO Billing Meter

89. Medium-Power FM Transmitter

90. Fire Alarm Using Thermistor

91. Solar Bug

92. Mosfet-Based Preamplifier for FM Radio DXing

93. Number Guessing Game

94. Solidstate Remote Control Switch

95. Musical Light Chaser

96. Water Level Indicator With Alarm

97. 2-Line Intercom-Cum-Telephone Line Changeover Circuit

98. Micromotor Controller

99. Smart Foot Switch

100. Speller Effect Sign Display

101. Teleconferencing System

102. Low-Cost Transistorised Intercom

103. Automatic School Bell

104. Telephone Ringer Using Timer ICs

105. Shadow Alarm

106. Mains Operated Christmas Star

107. Precision Digital AC Power Controller

108. Simple Analogue To Digital Converter

109. Flashing-Cum-Running Light

110. Parallel Telephones With Secrecy

111. Multiband CW Transmitter

112. Dual-Channel Digital Volume Control

113. Stabilised Power Supply With Short-Circuit Indication

114. Time Switch

115. Phone BroadCaster

116. Multi-Switch Doorbell With Indicators

117. Little Door Guard

118. Smart Cellphone Holder

119. IR Burglar Deterrent

120. Solidstate Switch For DC-Operated Gadgets

121. Auto Shut-off For Cassette Players And Amplifiers

122. Ultrasonic Proximity Detector

123. Brake Failure Indicator

124. Atmel AVR ISP Dongle

125. Crystal-Controlled Time-Base Generator

126. Telephone Call Meter Using Calculator And COB

127. Highway Alert Signal Lamp

128. Blown Fuse Indicator

129. Under-/Over-Voltage Beep for Manual Stabiliser

130. Anti-Bag-Snatching Alarm

131. Self-Switching Power Supply

132. Cordless Phone Backup

133. Versatile Water-Level Controller

134. Single Phase Electronic Starter

135. Non-Contact Power Monitor

136. Protection For Your Electrical Appliances

137. Tacho for Microprocessor Based Drives

138. Sound Controlled Flip-Flop

139. Add Auto Start To Generators

140. Versatile Variable Duration Digital Timer

141. Fancy Christmas Light

142. Tester For Remote Control

143. Versatile CMOS/TTL Logic And Clock Probe

144. Dice With 7-Segment Display

145. A Low Distortion Audio Pre-amplifier

146. Off-Line Telephone Tester

147. Audio-Visual Extra Ringer For Phone

148. PC Based Digital Clock

1. Stress Meter

2. Frequency Measurements Using PC

3. Infrared Bug

4. IR Music Transmitter and Receiver

5. Fuel Reserve Indicator For Vehicles

6. Low-Cost Electronic Quiz Table

7. Digital Switching System

8. Variable Power Supply Using a Fixed-Voltage Regulator IC

9. Voltage-Based Controller For Switches

10. Digital Dice

11. PC-Based 7-Segment Rolling Display

12. A Hierarchical Priority Encoder

13. Digital Speedometer

14. Digital Audio/Video Input Selector

15. 40-Metre Direct Conversion Receiver

16. Add-On Stereo Channel Selector

17. Versatile Power Supply

18. Magnetic Proximity Switch

19. Precision Attenuator With Digital Control

20. Mains Supply Failure Alarm

21. Speed Control of DC Motor Using Pulse-Width Modulation

22. Telephone Line Based Audio Muting And Light-On Circuit

23. Friendly Charger for Mobile Phones

24. Clap Remote

25. Secret Bell

26. Sensitive Vibration Detector

27. Heat-Sensitive Switch

28. Sleep-Switch Cum Wake-up Timer

29. Generation Of 1-Sec. Pulses Spaced 5-Sec. Apart

30. Safety Guard

31. Picnic Lamp

32. Colour Sensor

33. Fully Automatic Emergency Light

34. Miniature Strobe Light

35. Universal High-Resistance Voltmeter

36. Automatic Emergency Light

37. Front Door Guard

38. IR Remote Control

39. Automatic-Off Timer For CD Players

40. Telephone-Operated Calling System

41. Running Message Display

42. Ultrasonic Proximity Detector

43. Wiper Speed Controller

44. Tiny Dew Sensor

45. Magic Lights

46. Electronic Scoring Game

47. Hearing Aid

48. Clock Timer

49. Automatic Room Power Control

50. Car Anti-Theft Wireless Alarm

51. Intelligent Switch

52. Electronic Code Lock

53. FM Transmitter For Channel Changer

54. School/College Quiz Buzzer

55. Simple Short-Wave Transmitter

56. Fire Alarm

57. Electronic Horn

58. Digital Volume Control

59. UPS For Cordless Telephones

60. Parrot-Sounding AC Doorbell

61. Contactless AC Mains Voltage Detector

62. Low-Power Voltage Doubler

63. Automatic Dual-Output Display

64. Visual AC Mains Voltage Indicator

65. Simple Sensitive Remote Control Tester

66. Automatic Temperature Controlled Fan

67. Precision 1Hz Clock Generator Using Chip-On-Board

68. Smart Phone Light

69. Darkness Controlled Light Switch

70. Mobile Shield

71. Low Cost Transistorised Inverter

72. Bell-Cum Light Controller

73. Automatic Temperature Controller

74. Telecom Headset

75. Flying Saucer

76. Simple Intercom Circuit

77. Automatic Telephone Answering Machine

78. Appliance Timer-Cum-Clap Switch

79. AF/RF Signal Tracer

80. Ultra Low Drop Linear Regulator

81. Clap Switch

82. Fluid Level Detector

83. Light Fence

84. Anti-Collision Rear Light

85. Multi-Melody Generator With Instrumental Effect

86. Laptop Protector

87. Short Wave AM Transmitter

88. Telephone Call Counter

89. Tank Overflow Preventer

90. Running Lights Effect

91. Programmable LED Indicator

92. Automatic Phase Changer

93. Infrared Electronic Shooting Game

94. Handy Telephone Receiver

95. Low Current, High Voltage Power Supply

96. Battery Opeated High Voltage Source

97. MAT Switch

98. Sensitive Temperature Switch

99. Automatic Emergency Torch

100. Telephone Line Vigilant

101. Infrared Firecracker Igniter

102. Dancing Lights

103. Watch-Dog for Telephones

104. Four-In-One Burglar Alarm

105. Digital Dice With Numeric Display

106. 5-Band Graphic Equaliser

107. Handy Zener Diode Tester

108. Water Level Controller Using 3-Phase Starter

109. Capacitance Bridge

110. Ultrasonic Switch

111. Programmable Door-Bell With Flashing LEDs

112. Automatic Switch For Audio Power Amplifier

113. Economical Pump Controller

114. Low Cost Automatic Gate LIght With A Musical Bell

115. 7MHz CW/AM QRP Transmitter

116. Motorbike Alarm

117. Appliance Timer

118. Divide-By-N Counter Realisation Using ICs CD4033 And CD4017

119. Desktop Power Supply

120. Auto Reset Over/Under Voltage Cut-Out

121. Telephone Amplifier

122. Ready -To-Use Object Counter

123. Flashing Brakelight

124. A Highly Efficient DC Lamp Dimmer

125. Programmable Priority Time Switch

126. 33-Volt Tunning Voltage

127. High and Low Voltage Cutout With Delay and Melody

128. Accurate Electronic Stop-Watch

129. Simple Logic Probe

130. Computerised Morse Code Generator/Transmitter

131. Solidstate Relay with Under/Over Voltage Protection

132. Automatic Low-Power Emergency Light

133. Mobile Bug

134. Seismic Sensor

135. Current Sensor

136. Touch-Sensitive Musical Bell With Timer

137. Ramp Controlled Light

138. LED Lighting for Christmas

139. Solid-state Auto Power-Off/On Mains Failure

140. Programmable Musical Bell

141. Adjustable Dancing Lights

142. Hourly Chime Function Generator

143. Programmable 8-Digit Code Lock

144. Extension Phone Switcher

145. Soft Musical Telephone Ringer

146. Low Cost Electronic Clock

147. Powerful AM Radio Transmitter

148. Shutter Guard

Back