Electronic Project Volume - 03

Section A : Construction Projects
S.No
 Products
Page No.
01 Pulse Generator Cum  Timer  09
2 Make Yourself An Adjustable Ripple regulated power Supply 13
03 Make Yourself This Digital LED Voltmeter 16
04 Make yourself This Beeper -cum -Flasher  20
05 Make Yourself One Of These Low  - Cost Power Amplifiers  21
06 Try This Water Level Controller 23
07 Make Yourself This Temperature deviation Indicator  28
08 Automatic Emergency tube light  30
09 Make Yourself This  digital  Birth  Date Teller As A Party Game        32
10 A Digital clock Using Ordinary components 34
11 Extend Capabilities Of This Digital Clock  38
12 Cassette Tape Recorder Using BEL 700 IC 47
13 Water  Tank  Gauge  52
14 Make Yourself This Signal Injector  54
15 Build your Own 5 - State Logic Probe 58
16 Electronics Fuse Saves  precious  mains operated  gadgets  62
17 Single phasing  Preventer  64
18 Make Yourself This Long Duration  Timer  70
19 Digital STD Call Meter  72
20 Non - Destructive power supply  79
21 Tuning Indictors For  Radio receivers 81
22 Make yourself This Metal Detector  85
23 Automatic Traffic lights model  87
24 Preamplifier  circuits  97
25 Office call bell system  105
26 Make Yourself This Electronics 'Pachisi' Game  110
27 Make Yourself This Tele - Visage To Locate your phone In The Dark  115
28 Electronic  Horns For Cars  117
29 A Snooze  Switch For Mechanical alarm clocks 123
30 LED 'analogue ' clock  130
31 An Automatic emergency light with dual light provision  135
32 Make yourself A Car Battery System Analyzer 137

SECTION - B   CIRCUIT    IDEAS
1 A   Toy siren  14
2 Audio Level  Indictor   15
3 Light  dimmer 15
4 Regulated  Power Supply  With Dual  Purpose  LED   25
5 strobe  Light  25
6 Battery  Changeover relay   26
7 Spikes - free Power Control  26
8 A  variable  Audio  Frequency Oscillator 27
9 Burglar  Alarm   27
10 Fire  Alarm  44
11 Decade Sequencer  With Display  44
12 Add - On  Circuit  For  Current  Measurement  51
13 Sound Operated  Relay   51
14 Sequential  Timer  55
15 Beeper Using IC 555 56
16 LED Tuning  Indicator  56
17 Twilight   Switch  56
18 Photoelectric   switch  61
19 Telephone  Amplifier Using  IC700 66
20 Low Cost 'Longer  Distance ' Intercom  67
21 Regulated  Supply For Op - Amps 67
22 Guitar  Broadcaster   68
23 Debouncing  Circuit  68
24 False  Triggering  Elimination  In 555ICs 69
25 Who's  The First  76
26 AM  Transmitter   76
27 Dual Line Regulated  Power Supply   76
28 Battery  State  Indicator  77
29 Audio  Timer  77
30 Versatile  short - Proof Power Supply  For Experiments  78
31 Logic Probe /Logic  Pulsar  83
32 Under/Over  Voltage Protection  To  Fridge 88
33 Low  Voltage Indicator  88
34 Automatic  Water Level Indicator  89
35 Police   Siren  90
36 A  Nobel Burglar Alarm  90
37 A 4- Bit digital  To analog Converter  91
38 Dual  DC Power Supply 92
39 Bass And  Treble Controls For Stereo Systems 93
40 Replacing EF86 with Solid state  Circuitry  93
41 Battery Charger Cum Eliminator 94
42 Automatic  Parking Lights  94
43 Squire wave Generator  Using IC 555 95
44 Sound Effect  Generator 95
45 4 - Channel Audio Mixer  109
46 Variable  Duty - Cycle Oscillator  112
47 Single Transistor  Radio Tuner  112
48 Nexter  113
49 Coin Tosser  119
50 Choosing  The Faster Gate  119
51 Transistorized  Touch Switch  120
52 Variable Hysteretic Comparator  121
53 Three Voltages From Bridge Rectifiers 121
54 A Delay Relay  122
55 Automatic Defroster  127
56 Electronic  Color scope 127
57 Calling Bell With Memory  128
58 Car 'Lights- On' Indicator  128
59 Traffic Lights  Model  129
60 Mini Emergency Light 134
61 Heavy Duty Regulated Power Supply  139
62 16- Bit  To Any Set Of 8 - bit Gang Selector 141
63 Spark  Suppressor 142
64 Single Transistor  LDR Alarm 143
65 0 -24 V Regulated  DC Power Supply 143