Electronic Project Volume - 20

Section A : Construction Projects
S.No
 Products
Page No.
01 Digital I/O Add-On Card for PC XT/AT 03
02 Versatile FM stereo Receiver 07
03 Switchless Musical Calling Bell with Counter 13
04 CompuMaltiMeter - A Computer Interfaced Multimeter 16
05 Calling Number Identification System Using Calculator 20
06 Transformer Polarity Tester 23
07 Programmable Versatile Timer 25
08 Caller - ID Unit Using Micro - Controller 28
09 Mains Frequemcy Monitor 36
10 Party Game How Old Are You ? 38
11 Chip-Card Reader-Programmer Using IBM PC 41
12 Morse Encoder 46
13 Long Range Remote Control 49
14 Fast Charger for Inverter Batteries 52
15 Z-80 Based Dedicated Programmer Cum Emulator 55
16 8098 Development Board 69
17 Remote-Controlled Audio Processor Using Microcontroller 81
18 Soujunior - A Wireless Programmable Control Unit 89
19 50hz Sinewave Inveter Using MOSFETs 94
20 An 8085 Microprocessor Kit for Instructors 97
21 Multichannel Code Lock System 105
22 Automatic Induction Motor Starter with Programmanle Timer 108

SECTION - B   CIRCUIT    IDEAS
1 Telephone Line Vigilant 115
2 High and Low Voltage Cutout with Delay and Melody 116
3 Running Message Display 117
4 Colour Sensor 119
5 Low Current,High Voltage Power Supply 120
6 Audio-Visual Extra Ringer for Phone 121
7 Handy Zener Diode Tester 121
8 Automatic Emergency Light 122
9 Automatic Room Power Control 124
10 Telecom Headset 125
11 Smart Phone Light 126
12 Auto Reset Over/Under Voltage Cut-Out 127
13 Clap Remote 128
14 Time Switch 130
15 Water Level Indicator with Alarm 132
16 IC Controlled Emergency Light with Charger 133
17 Wiper Speed Controller 134
18 CD-ROM Dive as Digital-Audio CD-Player 135
19 Automatic Dual-Output Display 135
20 Miniature Strobe Light 136
21 Electronic Card Lock System 137
22 PC - Based 7-Segment Rolling Display 139
23 Contactless AC Mains Voltage Detector 140
24 Frequency Measurments Using PC 141
25 Telephone Number Display 142
26 Digital Switching System 144
27 40-Metre Direct Conversion Receiver 145
28 Precision 1 HZ Clock Generator using Chip-on-Board 146
29 Electronic Jam 147
30 Tiny Dew Sensor 148
31 Electronic Scoring Game 148
32 Simple Sensitive Remote Control Tester 149
33 Ultra Low Drop Linear Regulator 150
34 Magnetic Proximity Switch 151
35 Simple Low-Cost Digital Code Lock 151
36 Hand Proximity Musical Tone Generator 152
37 Wireless Musical Calling Bell 153
38 Simple Telephone Privacy Circuit 154
39 Bidirectional Code Converter 154
40 Priority Indicator For Quiz Contests 156
41 Dual-Channel Digital Volume Control 157
42 Water Level Controller Cum Motor Protector 158
43 Under Voltage Cut-out and Delay for Refrigerators 159
44 Infrared Cordless Headphone 160
45 Stabiliser with Auto Cut-off Arrangement 161
46 Simple Analogue-to-digital Converter 162
47 Sleep-switch cum Wake-up Timer 163
48 Charge Monitor for 12V Rechargeable Lead-acid Battery 164
49 Window/Fence  Charger 165
50 Cordless Phone Backup 166
51 PC - based Dice Game 167
52 Teleremote Control 168
53 Display Dialed Telephone Number Using Calculator 169
54 8253 Programmable Interval Timer 170
55 Low-cost Transistorised Intercom 171
56 Automatically Controlled Street Lights 172
57 Timer for Students 173
58 Prtecting Three-phase Induction Motors 174
59 Radio Remote Control 174
60 Sequential Card Scanner 175
61 Divide-by-n Counter Using IC 7442 177
62 DTMF Remote Switching Board 178
63 Electrical Equipment Control Using PC 179
64 Long Range FM Transmitter 181
65 Piezo Buzzer Finds Many Applications 182
66 Power Supply Circuits for Hams 185
67 Cyclic On and Off Timer for Cooler pump 186
68 Self-switching Power Supply 187