Electronic Project Volume - 22

Section A : Construction Projects
S.No
 Products
Page No.
01 Build  Your Own Pentium III PC 03
02 Automatic Room Light Controller 17
03 Intelligent Water Level Controller 21
04 A Unique Liquid Level Indicator 25
05 Interface Your Printer with 8085 Microprocessor 28
06 Morse Processor 33
07 Access-Control System 42
08 Telephone Line Interfaced Generic Switching System 46
09 Programmable Melody Generator 55
10 Auto Control for 3-Phase Motors 66
11 Telephone Remote Control 72
12 Microcontroller - Based School Timer 75
13 Digital Capacitance-cum-Frequency Meter 80
14 Fluild Level Controller with Indicator 84
15 MGMA - A Mighty Gadget with Multiple Applications 87
16 Traffic and Street Light Controller 91
17 Lead Acid Battery Charger with Active Power Control 98
18 Amplitude Measurement of Sub-Microsecond Pulses 101
19 Automatic Submersible Pump Controller 104
20 Transistor Curve Tracer 107
21 Tripping Sequecnce Recorder-cum-Indicator 113

SECTION - B   CIRCUIT    IDEAS
1 Electronic Starter for Single-phase Motors 119
2 Modem 'Ob/Off' Indicator 120
3 Touch Select Audio Source 121
4 Precision Attenuator with Digital Control 121
5 Precision Amplifier with Digital Control 122
6 Random Number Generator Based Game 123
7 9-Line Telephone Sharer 124
8 Electronic Card Lock System 126
9 Pulsed Operation of a CW Laser Diode 127
10 Generation of 1 sec Pulses Spaced 5 sec Apart 128
11 High/Low-Voltage Cutout with Timer 129
12 Automatic Heat Detector 130
13 Musical Touch Bell 131
14 Non Contact Liquid Level Controller 131
15 High Power Bicycle Horn 133
16 AC Mains Phase Sequence Indicator 133
17 Luxurious Toilet/Bathroom Facility 135
18 EEPROM W27C512 (Winbond) Eraser 136
19 Intelligent Electronic Lock 137
20 Stable 455KHz BFO for SSB Reception 139
21 Auto Shut off for Cassette Players and Amplifiers 139
22 House Security System 141
23 Simple Water Level Indicator cum Alarm 142
24 Precision Inductance and Capacitance Meter 142
25 Under/Over Voltage Beep for Mannual Stabiliser 144
26 Ultra Sensitive Solidstate Clap Switch 145
27 15 Step Digital Power Supply 145
28 Microphone for Computer 147
29 Versatile Zener Dioda Tester 147
30 DTMF Proximity Detector 149
31 Stepper Motor Control 149
32 Low Cost Intercom 150
33 Hight Power Car Battery Eliminator 151
34 Automatic Plant Irrigator 152
35 Simple Telephone Ring Tone Generator 152
36 Dual Input High Fidelity Audio Mixer 153
37 Unipolar/Bipolar Triangular and Bipolar Square Wave Generator 154
38 Anti Theft Security for Car Audios 155
39 PC-Based Dial Clock cum Electronic Roulette 156
40 Long Range Cordless Burglar Alarm 157
41 Water Level Controller 158
42 Invisible Broken Wire Detector 160
43 PC Based Multi Mode Light Chaser 161
44 Fuse Status Indicators for Power Supplies 163
45 A Hierarchical Priority Encoder 164
46 Digital Mains Voltage Indicator 165
47 Electronic Dice 166
48 Light Operated Organ 168
49 Stereo Tape Head Preamplifier for PC Sound Card 168
50 Heart Beat Monitor 169
51 Digital Fan Regulator 170
52 Running Lights and Running Holes 171
53 A Simple Transistor Tester 172
54 12V,3A Power Supply 172
55 Speller Effect Sign Display 173
56 Darkroom Timer 174
57 Active Shortwave Antenna 174
58 Long Range Target Shooter 175
59 Power Supply for Walkie-Talkies 176
60 High Performance Interruption Detector 177
61 Digital Relay Tester for RAX and MAX 178
62 Fastest Finger First Indicator 179
63 Decorative Signboard 180
64 Condenser Mic Audio Amplifier 181
65 Smoke Alarm 182
66 Overload Protector with Reset Button 183