Electronic Project Volume - 21

Section A : Construction Projects
S.No
 Products
Page No.
01 Conversion of Audio CD Player to Video CD Player - I 13
02 Conversion of Audio CD Player to Video CD Player - II 16
03 Microprocessor Controlled Transistor Led Identifier 19
04 Pc Based Speed Monitoring System 28
05 Stereo Cassette Plauer 33
06 Resonance Type L-C Meter 39
07 Electrolysis Proof Complete Water-Level Solution 44
08 Smart Clap Switch 49
09 Electronic Voting Machine 52
10 Digital Number Shooting Game 58
11 PC Interfaced Audio Playback device M Player 62
12 Portable Ozone Generator 69
13 Conferece Timer 77
14 Build your own C-band Satellite TV Receiver 80
15 EPROM Based Programmable Number Lock 87
16 Display Schems for Inidan Languages(Hardware & Sowtware) 90
17 8085 mocro. Kit Based Simple IC Tester 107
18 Digital Code Lock 111
19 Mosfet Based 50HZ UPS Cum EPS 115
20 R-2R D/A Converter Based Function Generator Using PIC16C84 Mic. 124
21 PC to PC Communication Using Infrared/Laser Beam 130
22 Multi Effect Chaser Lights using 8051 Mictocontroller 136
23 Electronic Bell System 140
24 Simple Telephone Recording/Answering Machine 144

SECTION - B   CIRCUIT    IDEAS
1 Multipurpose Circuit for Telephones 149
2 Simple Code Lock 149
3 Automatic Bathroom Light 150
4 Smart Fluid Level Indicator 151
5 Automatic School Bell System 152
6 Designing An RF Probe 154
7 Bass and Treble for Stereo System 154
8 Protection for Your Electrical Appliances 155
9 Digital Water Level Meter 156
10 Universal High Resistance Volmeter 157
11 Triac/Transistor Checker 158
12 A Novel Method of Frequency Variation Using 555 159
13 Pendulum Display 160
14 Audio Level Indicator 160
15 Clever Rain Alarm 162
16 Laser Controlled On/Off Switch 163
17 Telephone Conversation Recorder 163
18 Simple and Economic Single phasing Preventor 164
19 Water Tank Level Meter 165
20 Phone Broadcaster 167
21 Telephone Call meter using calculator and COB 167
22 Simple Electronic Code Lock 169
23 Mini Voice Processor 170
24 Latch up Alarm Using Opto Coupler 171
25 Stepper Motor Diver 171
26 Electronic Digital Techometer 172
27 Light Operated Light Switch 174
28 Precision Digital AC Power Controller 174
29 Luggage  security System 175
30 Add-On Stereo Channel Selector Cum Level Indicator 176
31 Water Temoerature Controller 177
32 Emergency Light 178
33 Parallel Telephone With Secrecy 180
34 Single Doorbell for Two Doors 181
35 Powerful Pest Repeller 181
36 Power - Supply Failure Alarm 182
37 Stopwatch Using COB and Calculator 182
38 Dial a Voltage 183
39 Electronic Dancing Peacock 184
40 Inverter Overload Protector with Delayed Auto Reset 185
41 Telephone Line Based Audio Muting and Light on circuit 186
42 Low Cost PCO Billing Meter 187
43 Automatic Muting Circuit For Audio Systems 188
44 2-line Intercopm cum telephone Line Changeover Circuit 189
45 Guard for Refrigerators and Air Conditioners 190
46 Radio Band Position Display 191
47 Binary to Dotmatrix Display Decoder/Driver 192
48 Automatic Speed Controlleer for Fans and Coolers 194
49 Blown Fuse Indicator 195
50 Over/Under-Voltage Cut off with on-time Delay 196
51 Our Button for Step.Run and Halt Commands 197
52 Simple Switch Mode Power Supply 198
53 Toilet Indicator 199
54 Feather-Touch Swiitches for Mains 200
55 Digital Fan Regulator 201
56 Telephone Ringer Using Timer Ics 203
57 Automatic Battery Charger 203
58 Temperature Measurement Instrument 205
59 Voice Bell 206
60 Moving Curtain Display 207
61 Proximity Detector 208
62 Multichannel control using soft switches 209
63 An Exclusive Sinewave Generator 210
64 TTL Three-State Logic Probe 211
65 AM DSB Transmitter for Hams 212
66 Ground Conductivity Measurement 213
67 Stepper Motor Control via Parallel Port 214