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Latest Issues
February 2010
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C
I R C U I T L A B
1
)
Numeric Water-level Indicator
(New)
2
)
Versatile Probe
(New)
Click to view in order of 'highest hits first'
S No.
Circuit Name
Hits
1
Security System Switcher
3391
2
Electronic Candles
4712
3
Pyroelectric Fire Alarm
5255
4
Telephone Call Recorder
6994
5
DuoPhone
8001
6
Mini UPS System
12919
7
Car-Reversing Horn With Flasher
6864
8
Short-Circuit Protection in DC Low-Voltage Systems
5894
9
Inverter for Soldering Iron
10367
10
Transistorised Logic Probe for TTL
4314
11
Constant-Current Battery Charger
12699
12
Multitone Siren
8635
13
Generator Room Light
13718
14
Liquid Level Alarm
17441
15
PC Power Manager
11854
16
Skin Response Meter
16908
17
Solar Panel based Charger and Small LED Lamp
23216
18
Electronic Bicycle Lock
19604
19
Remote-operated Master Switch
18803
20
USB Power Socket
18304
21
Triple Power Supply
17395
22
Smart Hearing Aid
12474
23
Midnight Security Light
24366
24
Automated Alarm Circuits
17859
25
Traffic Baton
16939
26
Laser-guided Door Opener
26437
27
Battery-level Indicator
26564
28
PC Temperature Controller
20908
29
Traffic Controller
24804
30
Night Alert
23681
31
Muscular Stimulator
17711
32
Wireless Switch
50762
33
Long-Range IR Transmitter
24756
34
Electric Window Fence Charger
6479
35
Three-Phase Appliance Protector
16323
36
PC Multimedia Speakers
28151
37
Aquarium Probe
18715
38
Bicycle Indicator
19950
39
Poor Man’s Hearing Aid
13390
40
Portable Lamp Flasher
16394
41
Staircase Light With Auto Switch-Off
21697
42
Car Anti-theft Guard
25356
43
USB Power Booster
29153
44
Smart Vibration Sensor
23504
45
Drinking Water alarm
35611
46
GLOW PLuG CONTROLLER
14665
47
Versatile CMOS TTL Logic And Clock Probe
10671
48
Tester For Remote Control
22435
49
Automatic Low-Power Emergency Light
32351
50
Mobile Bug
50386
51
LED Lighting for Christmas
34642
52
Current Sensor
31457
53
Seismic Sensor
26498
54
Dice With 7-Segment Display
23686
55
Motorbike Alarm
30333
56
Laptop Protector
50980
57
Shutter Guard
16510
58
Desktop Power Supply
27027
59
Mobile Shield
37438
60
Infrared Firecracker Igniter
26884
61
Automatic Phase Changer
27562
62
Flying Saucer
37661
63
Anti-Collision Rear Light
25882
64
Light Fence
27733
65
MAT Switch
24526
66
5-Band Graphic Equaliser
24229
67
Clock Timer
36986
68
Fully Automatic Emergency Light
46686
69
IR Music Transmitter and Receiver
51699
70
Electronic Horn
33073
71
Ultrasonic Proximity Detector
37356
72
Secret Bell
46554
73
Variable Power Supply Using a Fixed-Voltage Regulator IC
47905
74
Appliance Timer-Cum-Clap Switch
24420
75
Telephone-Operated Calling System
35228
76
Front Door Guard
37395
77
Bell-Cum Light Controller
23329
78
Friendly Charger for Mobile Phones
45057
79
Hearing Aid
31508
80
Speed Control of DC Motor Using Pulse-Width Modulation
43447
81
Remote-Controlled Fan Regulator
70135
82
Low-Power Voltage Doubler
26083
83
Parrot-Sounding AC Doorbell
25252
84
Multi-Melody Generator With Instrumental Effect
19389
85
School-College Quiz Buzzer
18853
86
Visual AC Mains Voltage Indicator
24215
87
Simple Short-Wave Transmitter
24841
88
Solar Lighting System
72502
89
Infrared Bug
39336
90
Picnic Lamp
33627
91
Versatile Power Supply
32289
92
Ultrasonic Proximity Detector
39563
93
Shadow Alarm
47238
94
IR Burglar Deterrent
57420
95
Versatile Water-Level Controller
43733
96
Automatic-Off Timer For CD Players
28859
97
Heat-Sensitive Switch
32823
98
Sensitive Vibration Detector
30913
99
Digital Dice
35397
100
Remote-Controlled Power-Off Switch
56345
101
Little Door Guard
39136
102
Stress Meter
41771
103
Teleconferencing System
44399
104
Medium-Power FM Transmitter
47018
105
Smart Cellphone Holder
38814
106
Fuel Reserve Indicator For Vehicles
35690
107
Brake Failure Indicator
41325
108
Safety Guard
30235
109
Mains Supply Failure Alarm
31696
110
Remote Control For Home Appliances
92483
111
Micromotor Controller
43772
112
Solar Bug
48048
113
Simple Digital Security System
52234
114
Digital Audio/Video Input Selector
21004
115
Auto Turn-Off Battery Charger
56677
116
Atmel AVR ISP Dongle
40354
117
Audio Amplifier for Personal Stereo
51425
118
Musical Light Chaser
45003
119
Water-Level Controller
76722
120
Hit Switch
47478
121
Fire Alarm Using Thermistor
46459
122
Electronic Watchdog
64961
123
Automatic School Bell
41446
124
Anti-Theft Alarm For Bikes
59406
125
DC Motor Control Using A Single Switch
46737
126
Solidstate Remote Control Switch
40792
127
Flashing-Cum-Running Light
37462
128
Quality FM Transmitter
83802
129
Stabilised Power Supply With Short-Circuit Indication
36404
130
Digital Stop Watch
52057
131
Cell-Phone-Controlled Audio/Video Mute Switch
47295
132
PC-Based DC Motor Speed Controller
63104
133
Child's Lamp
50544
134
Watchman Watcher
45760
135
Highway Alert Signal Lamp
34444
136
Low-Cost Electronic Quiz Table
32125
137
Mobile Cellphone Charger
84438
138
Smart Foot Switch
39334
139
Programmable Timer for Appliances
57255
140
Anti-Bag-Snatching Alarm
33079
141
LED-Based Message Display
90473
142
Multiband CW Transmitter
34334
143
Automatic Night Lamp With Morning Alarm
65483
144
Touch Dimmer
62626
145
Mosfet-Based Preamplifier for FM Radio DXing
42845
146
Non-Contact Power Monitor
30910
147
Remote-Operated Musical Bell
49216
148
Electronic Motor Starter
57064
149
Telephone Receiver
76465
150
Washing Machine Motor Controller
52089
151
Low-Cost Hearing Aid
46967
152
Over-Under-Voltage Protection of Electrical Appliances
36201
153
Parallel Telephone With Secrecy and Call Prevention
46746
154
Voltage-Based Controller For Switches
28197
155
DTMF Receiver IC MT8870 Tester
61393
156
Pulse Generator
51390
157
Infrared Remote Control Timer
56988
158
Clap Switch
99704
159
Multi-Switch Doorbell With Indicators
32262
160
Song Number Display
45160
161
Lead-Acid Battery Charger With Voltage Analyser
65908
162
Electronic Security System
148983
163
Three-Colour Display Using Bicolour LEDs
54329
164
Ultra-Bright LED Lamp
90032
165
Computerised Universal Timer
44224
166
Number Guessing Game
40151
167
PC-Based Oscilloscope
260526
168
Intruder Radio Alert System
53727
169
Flashing Beacon
51052
170
Knock Alarm
68537
171
Automated Traffic Signal Controller
81259
172
Infrared Toy Car Motor Controller
208379
173
Mains Manager
39736
174
Crystal-Controlled Time-Base Generator
30837
175
Mains Operated Christmas Star
33858
176
Music On-Hold For Telephones
39934
177
Solidstate Switch For DC-Operated Gadgets
32631
178
Ding-Dong Bell
75013
179
IR Remote Switch
105216
180
Shortwave Transmitter
50506
181
FM Booster
102659
182
Laser Torch-Based Voice Transmitter And Receiver
81652
183
Mobile Phone Battery Charger
78994
184
Fastest Finger First Indicator
56939
185
Condenser Mic Audio Amplifier
69370
186
DarkRoom Timer
44149
187
Speller Effect Sign Display
35668
188
Stereo Tape Head Preamplifier For PC Sound Card
41810
189
A Hierarchical Priority Encoder
27283
190
Digital Mains Voltage Indicator
49858
191
Water-Level Controller
93717
192
Invisible Broken Wire Detector
81240
193
Anti-Theft Security For Car Audios
49939
194
Simple Telephone Ring Tone Generator
48366
195
Versatile Zener Diode Tester
40373
196
DTMF Proximity Detector
67875
197
Under-/Over-Voltage Beep for Manual Stabiliser
25224
198
15-Step Digital Power Supply
67831
199
Auto Shut-off For Cassette Players And Amplifiers
31499
200
House Security System
142691
201
Generation Of 1-Sec. Pulses Spaced 5-Sec. Apart
25371
202
9-Line Telephone Sharer
67007
203
Musical ‘Touch’ Bell
56401
204
Automatic Heat Detector
58671
205
Single Phase Electronic Starter
33405
206
Precision Amplifier With Digital Control
41568
207
Precision Attenuator With Digital Control
27209
208
Infrared Electronic Shooting Game
18703
209
Telephone Ringer Using Timer ICs
34999
210
Blown Fuse Indicator
34578
211
Automatic Speed-Controller For Fans and Coolers
54808
212
2-Line Intercom-Cum-Telephone Line Changeover Circuit
37096
213
Low-Cost PCO Billing Meter
40652
214
Telephone Line Based Audio Muting And Light-On Circuit
25994
215
Power-Supply Failure Alarm
49032
216
Add-On Stereo Channel Selector
26661
217
Parallel Telephones With Secrecy
34218
218
Telephone Number Display
69222
219
Luggage Security System
45729
220
Precision Digital AC Power Controller
35501
221
Phone BroadCaster
34395
222
Telephone Call Meter Using Calculator And COB
33625
223
Telephone Conversation Recorder
44133
224
Universal High-Resistance Voltmeter
25686
225
Protection For Your Electrical Appliances
34921
226
Simple Code Lock
60320
227
Time Switch
39264
228
Digital Speedometer
47034
229
Long-Range FM Transmitter
222195
230
Self-Switching Power Supply
33690
231
Electrical Equipment Control Using PC
83763
232
Teleremote Control
53395
233
Low-Cost Transistorised Intercom
38269
234
Charge Monitor For 12V Rechargeable Lead-Acid Battery
68009
235
Cordless Phone Backup
31543
236
Sleep-Switch Cum Wake-up Timer
28589
237
Simple Analogue To Digital Converter
37822
238
Dual-Channel Digital Volume Control
36125
239
Infrared Cordless Headphone
74720
240
Magnetic Proximity Switch
30162
241
Simple Low-Cost Digital Code Lock
45118
242
Ultra Low Drop Linear Regulator
16162
243
Simple Sensitive Remote Control Tester
18994
244
Electronic Scoring Game
25278
245
Tiny Dew Sensor
25359
246
Electronic Jam
56691
247
Precision 1Hz Clock Generator Using Chip-On-Board
20699
248
Digital Switching System
35290
249
40-Metre Direct Conversion Receiver
31358
250
Frequency Measurements Using PC
33785
251
Contactless AC Mains Voltage Detector
21464
252
PC-Based 7-Segment Rolling Display
32454
253
Electronic Card-Lock System
62017
254
Miniature Strobe Light
28201
255
Automatic Dual-Output Display
19926
256
CD-ROM Drive As Digital-Audio CD-Player
52733
257
Clap Remote
33093
258
Wiper Speed Controller
25835
259
Water Level Indicator With Alarm
51558
260
IC Controlled Emergency Light With Charger
51676
261
Auto Reset Over/Under Voltage Cut-Out
7628
262
Smart Phone Light
21177
263
Automatic Emergency Light
37938
264
Telecom Headset
20237
265
Automatic Room Power Control
29633
266
Handy Zener Diode Tester
16039
267
Telephone Line Vigilant
14985
268
High and Low Voltage Cutout With Delay and Melody
12940
269
Colour Sensor
39616
270
Running Message Display
33476
271
Low Current, High Voltage Power Supply
17755
272
Audio-Visual Extra Ringer For Phone
10214
273
Solidstate Auto Power-Off/On Mains Failure
6053
274
7MHz CW/AM QRP Transmitter
7998
275
Intelligent Switch
33292
276
Fluid Level Detector
22072
277
Programmable Door-Bell With Flashing LEDs
16122
278
Clap Switch
30775
279
Computerised Morse Code Generator/Transmitter
6540
280
Accurate Electronic Stop-Watch
14041
281
Magic Lights
37775
282
Digital Dice With Numeric Display
18308
283
Sensitive Temperature Switch
18672
284
Automatic Temperature Controlled Fan
28912
285
Watch-Dog for Telephones
18085
286
FM Transmitter For Channel Changer
28783
287
UPS For Cordless Telephones
30982
288
Touch-Sensitive Musical Bell With Timer
14339
289
Programmable LED Indicator
20918
290
Economical Pump Controller
18743
291
Fire Alarm
36603
292
Short Wave AM Transmitter
19311
293
Automatic Emergency Torch
21733
294
Ramp Controlled Light
13429
295
Simple Intercom Circuit
25746
296
Tank Overflow Preventer
25350
297
33-Volt Tunning Voltage
15119
298
Appliance Timer
16598
299
Electronic Code Lock
35909
300
Flashing Brakelight
17641
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