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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
3302
2
Electronic Candles
4608
3
Pyroelectric Fire Alarm
5216
4
Telephone Call Recorder
6923
5
DuoPhone
7957
6
Mini UPS System
12783
7
Car-Reversing Horn With Flasher
6829
8
Short-Circuit Protection in DC Low-Voltage Systems
5851
9
Inverter for Soldering Iron
10329
10
Transistorised Logic Probe for TTL
4290
11
Constant-Current Battery Charger
12658
12
Multitone Siren
8601
13
Generator Room Light
13682
14
Liquid Level Alarm
17391
15
PC Power Manager
11820
16
Skin Response Meter
16843
17
Solar Panel based Charger and Small LED Lamp
23141
18
Electronic Bicycle Lock
19554
19
Remote-operated Master Switch
18756
20
USB Power Socket
18255
21
Triple Power Supply
17351
22
Smart Hearing Aid
12447
23
Midnight Security Light
24316
24
Automated Alarm Circuits
17822
25
Traffic Baton
16904
26
Laser-guided Door Opener
26381
27
Battery-level Indicator
26526
28
PC Temperature Controller
20872
29
Traffic Controller
24764
30
Night Alert
23647
31
Muscular Stimulator
17688
32
Wireless Switch
50669
33
Long-Range IR Transmitter
24708
34
Electric Window Fence Charger
6454
35
Three-Phase Appliance Protector
16299
36
PC Multimedia Speakers
28121
37
Aquarium Probe
18697
38
Bicycle Indicator
19929
39
Poor Man’s Hearing Aid
13370
40
Portable Lamp Flasher
16380
41
Staircase Light With Auto Switch-Off
21675
42
Car Anti-theft Guard
25332
43
USB Power Booster
29125
44
Smart Vibration Sensor
23486
45
Drinking Water alarm
35578
46
GLOW PLuG CONTROLLER
14645
47
Versatile CMOS TTL Logic And Clock Probe
10658
48
Tester For Remote Control
22418
49
Automatic Low-Power Emergency Light
32326
50
Mobile Bug
50337
51
LED Lighting for Christmas
34610
52
Current Sensor
31432
53
Seismic Sensor
26472
54
Dice With 7-Segment Display
23662
55
Motorbike Alarm
30307
56
Laptop Protector
50926
57
Shutter Guard
16498
58
Desktop Power Supply
27010
59
Mobile Shield
37396
60
Infrared Firecracker Igniter
26860
61
Automatic Phase Changer
27537
62
Flying Saucer
37627
63
Anti-Collision Rear Light
25863
64
Light Fence
27721
65
MAT Switch
24508
66
5-Band Graphic Equaliser
24209
67
Clock Timer
36961
68
Fully Automatic Emergency Light
46651
69
IR Music Transmitter and Receiver
51667
70
Electronic Horn
33054
71
Ultrasonic Proximity Detector
37327
72
Secret Bell
46526
73
Variable Power Supply Using a Fixed-Voltage Regulator IC
47869
74
Appliance Timer-Cum-Clap Switch
24404
75
Telephone-Operated Calling System
35207
76
Front Door Guard
37369
77
Bell-Cum Light Controller
23316
78
Friendly Charger for Mobile Phones
45021
79
Hearing Aid
31490
80
Speed Control of DC Motor Using Pulse-Width Modulation
43426
81
Remote-Controlled Fan Regulator
70092
82
Low-Power Voltage Doubler
26066
83
Parrot-Sounding AC Doorbell
25239
84
Multi-Melody Generator With Instrumental Effect
19375
85
School-College Quiz Buzzer
18836
86
Visual AC Mains Voltage Indicator
24200
87
Simple Short-Wave Transmitter
24823
88
Solar Lighting System
72439
89
Infrared Bug
39315
90
Picnic Lamp
33608
91
Versatile Power Supply
32272
92
Ultrasonic Proximity Detector
39548
93
Shadow Alarm
47195
94
IR Burglar Deterrent
57395
95
Versatile Water-Level Controller
43707
96
Automatic-Off Timer For CD Players
28843
97
Heat-Sensitive Switch
32806
98
Sensitive Vibration Detector
30894
99
Digital Dice
35383
100
Remote-Controlled Power-Off Switch
56313
101
Little Door Guard
39125
102
Stress Meter
41739
103
Teleconferencing System
44383
104
Medium-Power FM Transmitter
47003
105
Smart Cellphone Holder
38800
106
Fuel Reserve Indicator For Vehicles
35675
107
Brake Failure Indicator
41302
108
Safety Guard
30222
109
Mains Supply Failure Alarm
31685
110
Remote Control For Home Appliances
92431
111
Micromotor Controller
43758
112
Solar Bug
48025
113
Simple Digital Security System
52220
114
Digital Audio/Video Input Selector
21004
115
Auto Turn-Off Battery Charger
56649
116
Atmel AVR ISP Dongle
40331
117
Audio Amplifier for Personal Stereo
51404
118
Musical Light Chaser
44984
119
Water-Level Controller
76684
120
Hit Switch
47457
121
Fire Alarm Using Thermistor
46445
122
Electronic Watchdog
64921
123
Automatic School Bell
41431
124
Anti-Theft Alarm For Bikes
59379
125
DC Motor Control Using A Single Switch
46723
126
Solidstate Remote Control Switch
40781
127
Flashing-Cum-Running Light
37448
128
Quality FM Transmitter
83774
129
Stabilised Power Supply With Short-Circuit Indication
36398
130
Digital Stop Watch
52032
131
Cell-Phone-Controlled Audio/Video Mute Switch
47289
132
PC-Based DC Motor Speed Controller
63088
133
Child's Lamp
50530
134
Watchman Watcher
45743
135
Highway Alert Signal Lamp
34437
136
Low-Cost Electronic Quiz Table
32111
137
Mobile Cellphone Charger
84404
138
Smart Foot Switch
39325
139
Programmable Timer for Appliances
57245
140
Anti-Bag-Snatching Alarm
33070
141
LED-Based Message Display
90430
142
Multiband CW Transmitter
34325
143
Automatic Night Lamp With Morning Alarm
65462
144
Touch Dimmer
62608
145
Mosfet-Based Preamplifier for FM Radio DXing
42835
146
Non-Contact Power Monitor
30901
147
Remote-Operated Musical Bell
49203
148
Electronic Motor Starter
57049
149
Telephone Receiver
76445
150
Washing Machine Motor Controller
52075
151
Low-Cost Hearing Aid
46957
152
Over-Under-Voltage Protection of Electrical Appliances
36192
153
Parallel Telephone With Secrecy and Call Prevention
46739
154
Voltage-Based Controller For Switches
28191
155
DTMF Receiver IC MT8870 Tester
61384
156
Pulse Generator
51373
157
Infrared Remote Control Timer
56980
158
Clap Switch
99677
159
Multi-Switch Doorbell With Indicators
32255
160
Song Number Display
45148
161
Lead-Acid Battery Charger With Voltage Analyser
65899
162
Electronic Security System
148920
163
Three-Colour Display Using Bicolour LEDs
54307
164
Ultra-Bright LED Lamp
89994
165
Computerised Universal Timer
44215
166
Number Guessing Game
40134
167
PC-Based Oscilloscope
260411
168
Intruder Radio Alert System
53715
169
Flashing Beacon
51041
170
Knock Alarm
68519
171
Automated Traffic Signal Controller
81243
172
Infrared Toy Car Motor Controller
208333
173
Mains Manager
39729
174
Crystal-Controlled Time-Base Generator
30830
175
Mains Operated Christmas Star
33846
176
Music On-Hold For Telephones
39931
177
Solidstate Switch For DC-Operated Gadgets
32628
178
Ding-Dong Bell
74991
179
IR Remote Switch
105188
180
Shortwave Transmitter
50496
181
FM Booster
102642
182
Laser Torch-Based Voice Transmitter And Receiver
81630
183
Mobile Phone Battery Charger
78956
184
Fastest Finger First Indicator
56926
185
Condenser Mic Audio Amplifier
69355
186
DarkRoom Timer
44137
187
Speller Effect Sign Display
35661
188
Stereo Tape Head Preamplifier For PC Sound Card
41801
189
A Hierarchical Priority Encoder
27282
190
Digital Mains Voltage Indicator
49851
191
Water-Level Controller
93680
192
Invisible Broken Wire Detector
81223
193
Anti-Theft Security For Car Audios
49934
194
Simple Telephone Ring Tone Generator
48358
195
Versatile Zener Diode Tester
40365
196
DTMF Proximity Detector
67866
197
Under-/Over-Voltage Beep for Manual Stabiliser
25223
198
15-Step Digital Power Supply
67814
199
Auto Shut-off For Cassette Players And Amplifiers
31494
200
House Security System
142612
201
Generation Of 1-Sec. Pulses Spaced 5-Sec. Apart
25365
202
9-Line Telephone Sharer
66996
203
Musical ‘Touch’ Bell
56392
204
Automatic Heat Detector
58653
205
Single Phase Electronic Starter
33393
206
Precision Amplifier With Digital Control
41559
207
Precision Attenuator With Digital Control
27205
208
Infrared Electronic Shooting Game
18691
209
Telephone Ringer Using Timer ICs
34993
210
Blown Fuse Indicator
34570
211
Automatic Speed-Controller For Fans and Coolers
54790
212
2-Line Intercom-Cum-Telephone Line Changeover Circuit
37091
213
Low-Cost PCO Billing Meter
40643
214
Telephone Line Based Audio Muting And Light-On Circuit
25991
215
Power-Supply Failure Alarm
49020
216
Add-On Stereo Channel Selector
26653
217
Parallel Telephones With Secrecy
34213
218
Telephone Number Display
69202
219
Luggage Security System
45720
220
Precision Digital AC Power Controller
35500
221
Phone BroadCaster
34382
222
Telephone Call Meter Using Calculator And COB
33619
223
Telephone Conversation Recorder
44115
224
Universal High-Resistance Voltmeter
25682
225
Protection For Your Electrical Appliances
34911
226
Simple Code Lock
60298
227
Time Switch
39251
228
Digital Speedometer
47007
229
Long-Range FM Transmitter
222121
230
Self-Switching Power Supply
33678
231
Electrical Equipment Control Using PC
83741
232
Teleremote Control
53382
233
Low-Cost Transistorised Intercom
38257
234
Charge Monitor For 12V Rechargeable Lead-Acid Battery
67984
235
Cordless Phone Backup
31534
236
Sleep-Switch Cum Wake-up Timer
28582
237
Simple Analogue To Digital Converter
37804
238
Dual-Channel Digital Volume Control
36118
239
Infrared Cordless Headphone
74708
240
Magnetic Proximity Switch
30154
241
Simple Low-Cost Digital Code Lock
45105
242
Ultra Low Drop Linear Regulator
16160
243
Simple Sensitive Remote Control Tester
18987
244
Electronic Scoring Game
25268
245
Tiny Dew Sensor
25355
246
Electronic Jam
56675
247
Precision 1Hz Clock Generator Using Chip-On-Board
20691
248
Digital Switching System
35275
249
40-Metre Direct Conversion Receiver
31331
250
Frequency Measurements Using PC
33774
251
Contactless AC Mains Voltage Detector
21461
252
PC-Based 7-Segment Rolling Display
32448
253
Electronic Card-Lock System
61994
254
Miniature Strobe Light
28194
255
Automatic Dual-Output Display
19921
256
CD-ROM Drive As Digital-Audio CD-Player
52709
257
Clap Remote
33078
258
Wiper Speed Controller
25826
259
Water Level Indicator With Alarm
51530
260
IC Controlled Emergency Light With Charger
51655
261
Auto Reset Over/Under Voltage Cut-Out
7628
262
Smart Phone Light
21167
263
Automatic Emergency Light
37909
264
Telecom Headset
20228
265
Automatic Room Power Control
29621
266
Handy Zener Diode Tester
16027
267
Telephone Line Vigilant
14980
268
High and Low Voltage Cutout With Delay and Melody
12937
269
Colour Sensor
39588
270
Running Message Display
33447
271
Low Current, High Voltage Power Supply
17743
272
Audio-Visual Extra Ringer For Phone
10209
273
Solidstate Auto Power-Off/On Mains Failure
6053
274
7MHz CW/AM QRP Transmitter
7998
275
Intelligent Switch
33268
276
Fluid Level Detector
22060
277
Programmable Door-Bell With Flashing LEDs
16112
278
Clap Switch
30751
279
Computerised Morse Code Generator/Transmitter
6540
280
Accurate Electronic Stop-Watch
14033
281
Magic Lights
37737
282
Digital Dice With Numeric Display
18298
283
Sensitive Temperature Switch
18661
284
Automatic Temperature Controlled Fan
28890
285
Watch-Dog for Telephones
18075
286
FM Transmitter For Channel Changer
28768
287
UPS For Cordless Telephones
30958
288
Touch-Sensitive Musical Bell With Timer
14324
289
Programmable LED Indicator
20908
290
Economical Pump Controller
18728
291
Fire Alarm
36567
292
Short Wave AM Transmitter
19295
293
Automatic Emergency Torch
21714
294
Ramp Controlled Light
13420
295
Simple Intercom Circuit
25722
296
Tank Overflow Preventer
25327
297
33-Volt Tunning Voltage
15104
298
Appliance Timer
16582
299
Electronic Code Lock
35872
300
Flashing Brakelight
17612
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