Electronic Project Volume - 12

Section A : Construction Projects
S.No
 Products
Page No.
01 Dynamic Display 11
02 An Intercom With Hendset 14
03 Build Your Own 30 W + 30 W Stereo Hi - Fi Double Cassette Recorder 18
04 Multirange Adjustable Timer 29
05 Automatic Brightness Controller For TVs 32
06 A High Impedance Adapter For a Multimeter 36
07 Neo Digital Clock Part - 1 39
08 Neo Digital  Clock Part -2 44
09 Boolean Function Emulator 52
10 Built Your Own Two - Stage UHF TV Booster 58
11 Refrigeration Temprature Controller 61
12 Heavy Duty Voltage Stabiliser 64
13 Switch Mode Power Supply For Personal Computer 68
14 Composite Electronic Organ 76
15 Digital Clock With On - Off Timer 85
16 Day Date Computer 90
17 Electronic Ignition System For Automobiles 94
18 6 - Band  Low Cost  Graphic Equaliser 98
19 Make Your Own VHF Antenna Booster 101
20 Resetting Protector For Computers 105
21 Add - On Telephone Devices 108
22 Master - Slave Clock 113
23 Add - On Devices For Double Cassette Recorder 119
24 Dynamic Psychedelic Lights 124
25 Digital Channel Selector 128

SECTION - B   CIRCUIT    IDEAS
1 Electronic Switch For  3 - Band  Transistor 133
2 Electronic Number Lock 134
3 Three - In - One Circuit 135
4 Match Box Size Radio 136
5 Static Audio Wattmeter 137
6 Variable Switching Power Supply 138
7 Tubelight  Without Chock And Starter 139
8 Automatic Star - To - Delta Converter 140
9 Cassette Copier 142
10 A Precise Timer 143
11 Mains Supply Interruption Indicator 144
12 Singal Chip Crossover Detector For Line Over Voltage 145
13 Electronic Car Horn 146
14 Indicator Bell 147
15 Multi - Tone Generator 148
16 AM Transmitter 148
17 White / LF Noise Generator 149
18 Indoor Advertising Board 149
19 Simple Touch Dimmer Using Triacs 151
20 Charging Reminder For Emergency  Lights 151
21 1 To 10 Pulses From 4017 Counter 152
22 5 V To 20 V Regulator Power Supply 153
23 Smoke Alarm 154
24 Pulse Generator 155
25 Automatic Voltage Stabiliser 155
26 Automatic  2 - Mode Running Light 157
27 MW voice Transmitter ( Pen cell sized ) 158
28 Low Power Alarm With Automatic Switch - Off 159
29 Simple Electronic Sand - Glass 159
30 FM Communication System 160
31 Mains Wiring Fault Detector 161
32 Programmable  Organ 161
33 8 - Tone Multipurpose Sound Generator 162
34 High / Low Voltage Cut - Out 163
35 Digital Stop Watch 163
36 Frequncy Measurment On Multimeter 165
37 A Simple Intercom 166
38 Mini Chaser 167
39 Mains Voltage Indicator 167
40 ASC2 Keyboard Tester 168
41 Pocket  Radio Circuit Using ZN414 169
42 Compact Audio Cassette Duplicator 170
43 Super Simple Interruption Counter 172
44 Harmonic Distortion Meter 173
45 Condenser Lamp Dimmer 174
46 Simple Counter Using Calculator 175
47 Multiout Regulated Power Supply 175
48 Improved Melody Doorbell 176
49 Voltage - Window Comparator Follows Reference Voltage 177
50 Low - Cost Digital Code Combination lock 178
51 Seconds Display For Digital Clock 178
52 10 - Channel touch Switch 180
53 Auto Cut For Manual Stabilisers 181
54 Delay Starter 181
55 Door Alarm 182
56 Simple ' JAM ' 183
57 The LED Scanner 185
58 Melody From IC Timer 186
59 Disco Light Project 187
60 IC voltage Regulator 187
61 Audio Frequency Oscillator 189
62 Linear High Current Regulator 189
63 Ignition Indicator 191
64 Signal Injector Cum Tracer 192
65 Musical AF / IF Checker 193
66 Inverter - Based 3 - in - 1 Timer 193
67 All - In - One Circuit For Fridge 194
68 Ni - Cd Cell Charger 195
69 Digital Volume Controller 196
70 Phase Sequence Change Indicator 197
71 LML  Vespa Flasher 200
72 Dual Trace Generator 200
73 Complementary  Lighting control 201
74 Short - Proof Power Supply 201
75 Universal Cell Evalutor 203
76 Overdrain Protector For Lead  - Acid Accumulators 203
77  Clap  Switch 204