Electronic Project Volume - 17

Section A : Construction Projects
S.No
 Products
Page No.
01 Pocket Radio Cum Hearing Aid 03
02 Multichannel Call - Bell with Difital Display 05
03 Wide Band Booster Using FET 09
04 A Simple Design Of High Quality Bandstop Switching 11
05 Audibility Enhancer 13
06 Expandable Non - Holding Seequential Switching 16
07 Stereo Precussion Instrument 20
08 All-in-one Alarm 24
09 Novel Mains Running Lights 28
10 Auto Power Off 100-hour Timer With Alarm 31
11 Wireless Home Security System 35
12 Touch Controlled Variable Power Supply 38
13 Pattern Lighting 42
14 Programmable Liquid Level Controller 46
15 Self Inductance Meter 50
16 Moving Massage Display 53
17 Emergency Torch 57
18 A Tunable Sub-Woofer Preamplifier 60
19 Programmable Digital Time Switch 63
20 Data Acquisition Card for PC 67
21 Basic Radio Transmitter Design And Construction 70
22 Simple Analogue Interface for PC 74
23 Aautomatic Starter and 3-phase Mains-to-standby Changeover System 77
24 Variable DC Power Supply 81

SECTION - B   CIRCUIT    IDEAS
1 Fuse Failure Indicator Cum Fire Alarm 85
2 Magic - Eye 85
3 Programmable Gain OP Amplifier 86
4 Touch Operated SCR  Tester 86
5 Ambulance Siren Cum Beeper 87
6 Digital DC-to-DC Inverter 88
7 Microprocessor - based Reversible DC Motor Control 88
8 A  Versatile  Function Generator 89
9 Mains Failure Alarm Cum Fuse Indicator 91
10 Crystal Calibrator  For HAMs 91
11 Component  Tester 92
12 Positive  Pulse Triggered  Timer 93
13 First Pulse  Detector 93
14 A Regenerative SW Receiver 94
15 A Regulated Power Supply for Walkman 95
16 Mains Triggered Timers 95
17 Motor Protector and Water Fill Indicator 96
18 Automatic Streetlight Controller 96
19 Class A Headphone Amplifier 97
20 Automatic Inverter Switch 97
21 Automatic Cooler Pump  Controller 98
22 Single-Phasing Protector 99
23 Single FM Code Practice Transmitter 99
24 Digital Code Lock 100
25 Cordless FM Mic 101
26 Fridge Alert System 102
27 High-gain Low - noisse Stereo Preamplifier 103
28 Adding Hysteresis to Reed Switches 104
29 Simple Soil Moisture Controller 105
30 Symmetrical Low-Output Impedence Amplifier 105
31 Car Reverse Horn 106
32 Mono to Pseudo Stereo Converter 106
33 Audio/Video Modulator 107
34 Digital Doorbell 108
35 3-Colour Moving Curtain Display Name Plate 109
36 Missig Pulse Detector 110
37 Touch Sensitive LED Chaser 111
38 Solid State Relay With  Zero Crossing Trigger 111
39 Low-Cost UHF to VHF Converter 112
40 Single Phasing Cum Phase Recerval Preventer 112
41 LED Direction Indicator 113
42 Three Band Active Tone Control 114
43 10 - Channel  Touch Switch With Display 115
44 Crystal  Tester 116
45 Mini Traffic Signal Generator 116
46 Broadband RF  Amplifier 118
47 Low  - Resistance Continuity Tester 119
48 Security System 119
49 Single - Chip Audible Logic Probe 120
50 Remote Digital Step Controller 121
51 Producnig Pulses With Narrow Width Using  IC 555 122
52 Quiz Master 122
53 Handheld  Rig Supply 123
54 Controlled  Automobile  Horn 124
55 Transformerless  12 V  Dual  Power Supply 125
56 Infrared  Burglar Alarm  With  Timer 125
57 Low - Cost  Coaxial Code  Tester 126
58 A simgle Chip  High Power Amplifier 126
59 Security System 128
60 Touch - Sensitive  Single - Chip Flasher - Cum - Beeper 128
61 Off delay Using FET 129
62 High / Low Voltage  Cut - Out With Hold  On 130
63 A Miniature Sized  Loud  Siren 130
64 Versatile Liquid level Controller And Indicator 131
65 Telephone Ring Sound  Generator 132
66 Low Voltage Indicator 133
67 Auto  Off Ni - Cd - Battery  Charger 133
68 Dual Polarity Output From Single Ended Supply 134
69 Digital  Fluid Multi Level  Indicator With  Alarm 134
70 Auto Hi - Lo Beam Contoller 136
71 Emergency Light With Twillight  Switch 136
72 Colour Changing Stereo Audio Level Indicator 137