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Latest Issues


   C I R C U I T     L A B

 

1Liquid Level Alarm (New)
2Generator Room Light (New)

Click to view in order of 'highest hits first'
S No.Circuit NameHits
1PC Power Manager1130
2Skin Response Meter1556
3Solar Panel based Charger and Small LED Lamp5569
4Electronic Bicycle Lock3644
5Remote-operated Master Switch6189
6USB Power Socket5025
7Triple Power Supply7246
8Smart Hearing Aid4329
9Midnight Security Light11101
10Automated Alarm Circuits8033
11Traffic Baton8565
12Laser-guided Door Opener12812
13Battery-level Indicator14068
14PC Temperature Controller11100
15Traffic Controller13485
16Night Alert12803
17Muscular Stimulator10225
18Wireless Switch26476
19Long-Range IR Transmitter14928
20Electric Window Fence Charger888
21Three-Phase Appliance Protector10565
22PC Multimedia Speakers18037
23Aquarium Probe12208
24Bicycle Indicator13111
25Poor Man’s Hearing Aid8048
26Portable Lamp Flasher10902
27Staircase Light With Auto Switch-Off14454
28Car Anti-theft Guard16397
29USB Power Booster20931
30Smart Vibration Sensor15735
31Drinking Water alarm23673
32GLOW PLuG CONTROLLER10269
33Versatile CMOS TTL Logic And Clock Probe7441
34Tester For Remote Control16029
35Automatic Low-Power Emergency Light24071
36Mobile Bug34714
37LED Lighting for Christmas23143
38Current Sensor22564
39Seismic Sensor18802
40Dice With 7-Segment Display16435
41Motorbike Alarm22488
42Laptop Protector35153
43Shutter Guard12451
44Desktop Power Supply20702
45Mobile Shield27962
46Infrared Firecracker Igniter20732
47Automatic Phase Changer21122
48Flying Saucer27841
49Anti-Collision Rear Light20365
50Light Fence21709
51MAT Switch18689
525-Band Graphic Equaliser18848
53Clock Timer29034
54Fully Automatic Emergency Light36804
55IR Music Transmitter and Receiver41614
56Electronic Horn25855
57Ultrasonic Proximity Detector30184
58Secret Bell36237
59Variable Power Supply Using a Fixed-Voltage Regulator IC39059
60Appliance Timer-Cum-Clap Switch20582
61Telephone-Operated Calling System28483
62Front Door Guard30237
63Bell-Cum Light Controller19475
64Friendly Charger for Mobile Phones34851
65Hearing Aid25914
66Speed Control of DC Motor Using Pulse-Width Modulation35315
67Remote-Controlled Fan Regulator56503
68Low-Power Voltage Doubler21368
69Parrot-Sounding AC Doorbell20725
70Multi-Melody Generator With Instrumental Effect16147
71School/College Quiz Buzzer13784
72Visual AC Mains Voltage Indicator20228
73Simple Short-Wave Transmitter20962
74Solar Lighting System58861
75Infrared Bug33708
76Picnic Lamp28128
77Versatile Power Supply28221
78Ultrasonic Proximity Detector34526
79Shadow Alarm39409
80IR Burglar Deterrent50764
81Versatile Water-Level Controller36310
82Automatic-Off Timer For CD Players24749
83Heat-Sensitive Switch27814
84Sensitive Vibration Detector26532
85Digital Dice30088
86Remote-Controlled Power-Off Switch48653
87Little Door Guard33935
88Stress Meter34670
89Teleconferencing System38226
90Medium-Power FM Transmitter41223
91Smart Cellphone Holder33741
92Fuel Reserve Indicator For Vehicles30994
93Brake Failure Indicator34821
94Safety Guard25982
95Mains Supply Failure Alarm27524
96Remote Control For Home Appliances78918
97Micromotor Controller38370
98Solar Bug41434
99Simple Digital Security System45699
100Digital Audio/Video Input Selector20928
101Auto Turn-Off Battery Charger48885
102Atmel AVR ISP Dongle35015
103Audio Amplifier for Personal Stereo45765
104Musical Light Chaser39275
105Water-Level Controller66716
106Hit Switch41562
107Fire Alarm Using Thermistor40710
108Electronic Watchdog56141
109Automatic School Bell35852
110Anti-Theft Alarm For Bikes51998
111DC Motor Control Using A Single Switch41389
112Solidstate Remote Control Switch37098
113Flashing-Cum-Running Light33727
114Quality FM Transmitter75399
115Stabilised Power Supply With Short-Circuit Indication33039
116Digital Stop Watch46180
117Cell-Phone-Controlled Audio/Video Mute Switch46320
118PC-Based DC Motor Speed Controller57240
119Child's Lamp44520
120Watchman Watcher40310
121Highway Alert Signal Lamp30696
122Low-Cost Electronic Quiz Table28451
123Mobile Cellphone Charger72311
124Smart Foot Switch35043
125Programmable Timer for Appliances52563
126Anti-Bag-Snatching Alarm29791
127LED-Based Message Display79888
128Multiband CW Transmitter31697
129Automatic Night Lamp With Morning Alarm59254
130Touch Dimmer55708
131Mosfet-Based Preamplifier for FM Radio DXing39318
132Non-Contact Power Monitor28446
133Remote-Operated Musical Bell45712
134Electronic Motor Starter51422
135Telephone Receiver70940
136Washing Machine Motor Controller47486
137Low-Cost Hearing Aid42998
138Over-/Under-Voltage Protection of Electrical Appliances33695
139Parallel Telephone With Secrecy and Call Prevention43444
140Voltage-Based Controller For Switches25933
141DTMF Receiver IC MT8870 Tester57280
142Pulse Generator46489
143Infrared Remote Control Timer53074
144Clap Switch89514
145Multi-Switch Doorbell With Indicators29938
146Song Number Display41116
147Lead-Acid Battery Charger With Voltage Analyser60670
148Electronic Security System128779
149Three-Colour Display Using Bicolour LEDs49790
150Ultra-Bright LED Lamp78299
151Computerised Universal Timer41076
152Number Guessing Game36343
153PC-Based Oscilloscope235919
154Intruder Radio Alert System50279
155Flashing Beacon46886
156Knock Alarm63006
157Automated Traffic Signal Controller74306
158Infrared Toy Car Motor Controller193809
159Mains Manager36916
160Crystal-Controlled Time-Base Generator28682
161Mains Operated Christmas Star31327
162Music On-Hold For Telephones37816
163Solidstate Switch For DC-Operated Gadgets29944
164Ding-Dong Bell68199
165IR Remote Switch96811
166Shortwave Transmitter46800
167FM Booster95210
168Laser Torch-Based Voice Transmitter And Receiver75301
169Mobile Phone Battery Charger69245
170Fastest Finger First Indicator50857
171Condenser Mic Audio Amplifier64145
172DarkRoom Timer39893
173Speller Effect Sign Display32884
174Stereo Tape Head Preamplifier For PC Sound Card38950
175A Hierarchical Priority Encoder24962
176Digital Mains Voltage Indicator45470
177Water-Level Controller83541
178Invisible Broken Wire Detector72961
179Anti-Theft Security For Car Audios46140
180Simple Telephone Ring Tone Generator45170
181Versatile Zener Diode Tester37229
182DTMF Proximity Detector63637
183Under-/Over-Voltage Beep for Manual Stabiliser24972
18415-Step Digital Power Supply62579
185Auto Shut-off For Cassette Players And Amplifiers29353
186House Security System122282
187Generation Of 1-Sec. Pulses Spaced 5-Sec. Apart23122
1889-Line Telephone Sharer62879
189Musical ‘Touch’ Bell52844
190Automatic Heat Detector52709
191Single Phase Electronic Starter29943
192Precision Amplifier With Digital Control38717
193Precision Attenuator With Digital Control25097
194Infrared Electronic Shooting Game15272
195Telephone Ringer Using Timer ICs32188
196Blown Fuse Indicator30702
197Automatic Speed-Controller For Fans and Coolers48918
1982-Line Intercom-Cum-Telephone Line Changeover Circuit34506
199Low-Cost PCO Billing Meter37046
200Telephone Line Based Audio Muting And Light-On Circuit23654
201Power-Supply Failure Alarm44313
202Add-On Stereo Channel Selector24520
203Parallel Telephones With Secrecy31623
204Telephone Number Display63076
205Luggage Security System40987
206Precision Digital AC Power Controller32827
207Phone BroadCaster31364
208Telephone Call Meter Using Calculator And COB30613
209Telephone Conversation Recorder39627
210Universal High-Resistance Voltmeter23237
211Protection For Your Electrical Appliances30486
212Simple Code Lock52565
213Time Switch34381
214Digital Speedometer37582
215Long-Range FM Transmitter201707
216Self-Switching Power Supply30162
217Electrical Equipment Control Using PC77770
218Teleremote Control48564
219Low-Cost Transistorised Intercom34468
220Charge Monitor For 12V Rechargeable Lead-Acid Battery60409
221Cordless Phone Backup28743
222Sleep-Switch Cum Wake-up Timer24924
223Simple Analogue To Digital Converter33811
224Dual-Channel Digital Volume Control32822
225Infrared Cordless Headphone68109
226Magnetic Proximity Switch26824
227Simple Low-Cost Digital Code Lock40567
228Ultra Low Drop Linear Regulator14507
229Simple Sensitive Remote Control Tester16723
230Electronic Scoring Game21615
231Tiny Dew Sensor21898
232Electronic Jam48836
233Precision 1Hz Clock Generator Using Chip-On-Board17727
234Digital Switching System30333
23540-Metre Direct Conversion Receiver27412
236Frequency Measurements Using PC29852
237Contactless AC Mains Voltage Detector18383
238PC-Based 7-Segment Rolling Display28109
239Electronic Card-Lock System54675
240Miniature Strobe Light24882
241Automatic Dual-Output Display17365
242CD-ROM Drive As Digital-Audio CD-Player46385
243Clap Remote27566
244Wiper Speed Controller22279
245Water Level Indicator With Alarm43166
246IC Controlled Emergency Light With Charger45261
247Auto Reset Over/Under Voltage Cut-Out7557
248Smart Phone Light17610
249Automatic Emergency Light30555
250Telecom Headset16711
251Automatic Room Power Control23642
252Handy Zener Diode Tester12975
253Telephone Line Vigilant12615
254High and Low Voltage Cutout With Delay and Melody10695
255Colour Sensor30986
256Running Message Display26460
257Low Current, High Voltage Power Supply14217
258Audio-Visual Extra Ringer For Phone8376
259Solidstate Auto Power-Off/On Mains Failure5977
2607MHz CW/AM QRP Transmitter7926
261Intelligent Switch25587
262Fluid Level Detector17635
263Programmable Door-Bell With Flashing LEDs12980
264Clap Switch22627
265Computerised Morse Code Generator/Transmitter6468
266Accurate Electronic Stop-Watch11047
267Magic Lights27967
268Digital Dice With Numeric Display14265
269Sensitive Temperature Switch14706
270Automatic Temperature Controlled Fan21946
271Watch-Dog for Telephones14004
272FM Transmitter For Channel Changer23147
273UPS For Cordless Telephones25254
274Touch-Sensitive Musical Bell With Timer10785
275Programmable LED Indicator15922
276Economical Pump Controller14223
277Fire Alarm27082
278Short Wave AM Transmitter15274
279Automatic Emergency Torch15834
280Ramp Controlled Light10291
281Simple Intercom Circuit19765
282Tank Overflow Preventer17938
28333-Volt Tunning Voltage11658
284Appliance Timer12718
285Electronic Code Lock25878
286Flashing Brakelight12739
287IR Remote Control29446
288Car Anti-Theft Wireless Alarm23950
289Divide-By-N Counter Realisation Using ICs CD4033 And CD401714102
290Soft Musical Telephone Ringer9412
291Low Cost Transistorised Inverter22922
292Automatic Telephone Answering Machine19610
293Hourly Chime Function Generator10309
294Programmable Priority Time Switch11724
295Digital Volume Control24072
296Extension Phone Switcher9391
297Battery Opeated High Voltage Source15747
298Handy Telephone Receiver15154
299A Highly Efficient DC Lamp Dimmer12001
300Low Cost Automatic Gate LIght With A Musical Bell14018

 
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