Electronic Project Volume - 14

Section A : Construction Projects
S.No
 Products
Page No.
01 LED Speedometer 3
02 Walkman Radio Player 5
03 High-Power Stereo Integrated Amplifier 7
04 Count-Down Timer 13
05 The New Generation Stehoscope 18
06 Cordless Remote Control 22
07 Infrared Proximity Sensor 25
08 Add-On-Devices For Multimeter 28
09 Multichannel Fire Alarm System 31
10 Transformer Tester 35
11 Emergency Light Using 23cm Fluorescent Tube 37
12 Touch-Operated Digital Volume Control 40
13 Kettle Timer 43
14 Auto Protection For Refrigerator 46
15 Watchdog For Your Mains 49
16 A Portable Data Logger 52
17 Revolving Seconds Display 56
18 Automatic Proch Light Cum Doorphone 62
19 100W Power Amplifier 66
20 Automatic Frequency Counter 71
21 Multistation Intercom 75
22 Autocue For The Speaker Who Won't Stop 79
23 A Unique Christmas Star 83
24 Electronic Tanpura 85

SECTION - B   CIRCUIT    IDEAS
1 Inrared Remote Control Switch 91
2 Two-In-One Emergency Light 92
3 Fire Alarm 93
4 Electronic Calender 92
5 Lamp Intensity Contoller 93
6 Power Failure Indicator 95
7 Feather-Touch Switching For Battery Operated Equipment 97
8 Crystal Go-No-Go tester 97
9 Fluid Level Monitor 98
10 Digital Voume Control 99
11 Battary Eliminator 100
12 Super Simple Intercom 100
13 Programmable Digital Staircase Generator 102
14 Disco Light Without Transformer 103
15 20+20W stereo Amplifier 104
16 Continuity Tester Cum Capacitance Meter 105
17 Loud Ringing and Blinking Light For Telephone System 105
18 Emergency Light with Charger 106
19 Car Horn with Hindi Song Tunes 107
20 Temperature Alarm 107
21 Mail Indicator 108
22 FM Receiver 109
23 Inexpensive Bar Generator 110
24 Manual Morse Code Generator 110
25 Phase Sequence Detector and Decoupler 111
26 Superb Equaliser 113
27 Musical Sound Generator 113
28 Speech Preparator 114
29 Background Nosie Filter 115
30 Component Tester 116
31 Solidstate Emergency Power Supply Unit 117
32 Fully electronic Controlled Voltage Stabiliser 118
33 Dual Tone Siren 119
34 Phase Difference Measurement Using Phase Locked Loop 119
35 Safety Indicator for TTL Circuits 121
36 Parsimonius Twilight Switch 121
37 Hi-Fi Intercom Cum FM Transmitter 122
38 Safety Switch 123
39 Two in One Game 123
40 Digital Speed Control of DC Motor 124
41 Speed Contoller for DC Micro motor 126
42 Security Systems for Cars 127
43 Mini Advertisement Display 128
44 Automatic Toilet Lamp 129
45 2 + 2 Watt Stereo Amplifier 130
46 Automatic Control for Outdoor Lights 131
47 Fax Guard 132
48 Auto Power-Off for TV 132
49 Touch Controlled Alarm 133
50 Digital High-Low Game 134
51 Multi-mode Sequential Lights 135
52 Auto Level Graph 137
53 Touch Volume Control 138
54 DC Motor Direction Controller 139
55 IC 555 Tester, Indicator Cum Disco Light 140
56 An Inexpensive 144 MHz RF Source 141
57 Precision Under/Over Frequency Alarm 142
58 Automatic Speed Changing Counter 143
59 The Unique De-Thumper 144
60 A Stable BFO for Amateurs 145
61 Pulse Generator with Four Independent Controls 146
62 Programmable Organ 147
63 Simple Hi-Fi Headphone Amplifier 147
64 20-Rung Counter Using A single 4017 148
65 Low-Cost CW Electronic Keyer 149
66 Farrous Metal Detector 150
67 On/Off Remote Control Switch 151
68 Sleep Timer with Alarm 152
69 Single to Dual-Trace Oscilloscope Convertor 154
70 Electronic Plant Watering 154
71 1W Amplifier for Touch Organ 156
72 CMOS Transistor Diode Tester 156
73 Water Level Indicatopr And Controller 157
74 Audio-Visual Telephone Indicator 159
75 Time Division Multiplier using Multiplexer 159
76 Squre-Triangular Wave Generator 160
77 A Versatile Rhythm Aid 161