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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 Manager1038
2Skin Response Meter1442
3Solar Panel based Charger and Small LED Lamp5485
4Electronic Bicycle Lock3576
5Remote-operated Master Switch6140
6USB Power Socket4960
7Triple Power Supply7196
8Smart Hearing Aid4286
9Midnight Security Light11052
10Automated Alarm Circuits7984
11Traffic Baton8531
12Laser-guided Door Opener12753
13Battery-level Indicator14015
14PC Temperature Controller11057
15Traffic Controller13440
16Night Alert12750
17Muscular Stimulator10182
18Wireless Switch26380
19Long-Range IR Transmitter14888
20Electric Window Fence Charger854
21Three-Phase Appliance Protector10541
22PC Multimedia Speakers17990
23Aquarium Probe12180
24Bicycle Indicator13089
25Poor Man’s Hearing Aid8025
26Portable Lamp Flasher10877
27Staircase Light With Auto Switch-Off14426
28Car Anti-theft Guard16364
29USB Power Booster20900
30Smart Vibration Sensor15709
31Drinking Water alarm23630
32GLOW PLuG CONTROLLER10255
33Versatile CMOS TTL Logic And Clock Probe7430
34Tester For Remote Control16008
35Automatic Low-Power Emergency Light24043
36Mobile Bug34651
37LED Lighting for Christmas23107
38Current Sensor22529
39Seismic Sensor18778
40Dice With 7-Segment Display16417
41Motorbike Alarm22455
42Laptop Protector35079
43Shutter Guard12432
44Desktop Power Supply20677
45Mobile Shield27939
46Infrared Firecracker Igniter20711
47Automatic Phase Changer21088
48Flying Saucer27803
49Anti-Collision Rear Light20340
50Light Fence21679
51MAT Switch18666
525-Band Graphic Equaliser18824
53Clock Timer29009
54Fully Automatic Emergency Light36764
55IR Music Transmitter and Receiver41570
56Electronic Horn25820
57Ultrasonic Proximity Detector30157
58Secret Bell36193
59Variable Power Supply Using a Fixed-Voltage Regulator IC39029
60Appliance Timer-Cum-Clap Switch20565
61Telephone-Operated Calling System28453
62Front Door Guard30211
63Bell-Cum Light Controller19455
64Friendly Charger for Mobile Phones34822
65Hearing Aid25892
66Speed Control of DC Motor Using Pulse-Width Modulation35282
67Remote-Controlled Fan Regulator56453
68Low-Power Voltage Doubler21343
69Parrot-Sounding AC Doorbell20702
70Multi-Melody Generator With Instrumental Effect16129
71School/College Quiz Buzzer13784
72Visual AC Mains Voltage Indicator20215
73Simple Short-Wave Transmitter20948
74Solar Lighting System58815
75Infrared Bug33688
76Picnic Lamp28102
77Versatile Power Supply28201
78Ultrasonic Proximity Detector34501
79Shadow Alarm39385
80IR Burglar Deterrent50739
81Versatile Water-Level Controller36285
82Automatic-Off Timer For CD Players24730
83Heat-Sensitive Switch27797
84Sensitive Vibration Detector26515
85Digital Dice30071
86Remote-Controlled Power-Off Switch48616
87Little Door Guard33907
88Stress Meter34640
89Teleconferencing System38190
90Medium-Power FM Transmitter41205
91Smart Cellphone Holder33713
92Fuel Reserve Indicator For Vehicles30980
93Brake Failure Indicator34788
94Safety Guard25967
95Mains Supply Failure Alarm27504
96Remote Control For Home Appliances78876
97Micromotor Controller38353
98Solar Bug41400
99Simple Digital Security System45680
100Digital Audio/Video Input Selector20927
101Auto Turn-Off Battery Charger48854
102Atmel AVR ISP Dongle34982
103Audio Amplifier for Personal Stereo45746
104Musical Light Chaser39245
105Water-Level Controller66681
106Hit Switch41539
107Fire Alarm Using Thermistor40692
108Electronic Watchdog56114
109Automatic School Bell35836
110Anti-Theft Alarm For Bikes51965
111DC Motor Control Using A Single Switch41368
112Solidstate Remote Control Switch37078
113Flashing-Cum-Running Light33709
114Quality FM Transmitter75368
115Stabilised Power Supply With Short-Circuit Indication33024
116Digital Stop Watch46148
117Cell-Phone-Controlled Audio/Video Mute Switch46314
118PC-Based DC Motor Speed Controller57213
119Child's Lamp44503
120Watchman Watcher40286
121Highway Alert Signal Lamp30673
122Low-Cost Electronic Quiz Table28437
123Mobile Cellphone Charger72266
124Smart Foot Switch35022
125Programmable Timer for Appliances52539
126Anti-Bag-Snatching Alarm29780
127LED-Based Message Display79845
128Multiband CW Transmitter31685
129Automatic Night Lamp With Morning Alarm59229
130Touch Dimmer55679
131Mosfet-Based Preamplifier for FM Radio DXing39306
132Non-Contact Power Monitor28436
133Remote-Operated Musical Bell45700
134Electronic Motor Starter51402
135Telephone Receiver70913
136Washing Machine Motor Controller47468
137Low-Cost Hearing Aid42979
138Over-/Under-Voltage Protection of Electrical Appliances33692
139Parallel Telephone With Secrecy and Call Prevention43432
140Voltage-Based Controller For Switches25922
141DTMF Receiver IC MT8870 Tester57267
142Pulse Generator46466
143Infrared Remote Control Timer53060
144Clap Switch89481
145Multi-Switch Doorbell With Indicators29926
146Song Number Display41101
147Lead-Acid Battery Charger With Voltage Analyser60643
148Electronic Security System128715
149Three-Colour Display Using Bicolour LEDs49777
150Ultra-Bright LED Lamp78259
151Computerised Universal Timer41062
152Number Guessing Game36334
153PC-Based Oscilloscope235837
154Intruder Radio Alert System50260
155Flashing Beacon46868
156Knock Alarm62977
157Automated Traffic Signal Controller74278
158Infrared Toy Car Motor Controller193763
159Mains Manager36906
160Crystal-Controlled Time-Base Generator28671
161Mains Operated Christmas Star31312
162Music On-Hold For Telephones37806
163Solidstate Switch For DC-Operated Gadgets29934
164Ding-Dong Bell68168
165IR Remote Switch96787
166Shortwave Transmitter46785
167FM Booster95180
168Laser Torch-Based Voice Transmitter And Receiver75273
169Mobile Phone Battery Charger69216
170Fastest Finger First Indicator50826
171Condenser Mic Audio Amplifier64119
172DarkRoom Timer39880
173Speller Effect Sign Display32873
174Stereo Tape Head Preamplifier For PC Sound Card38940
175A Hierarchical Priority Encoder24949
176Digital Mains Voltage Indicator45450
177Water-Level Controller83496
178Invisible Broken Wire Detector72933
179Anti-Theft Security For Car Audios46129
180Simple Telephone Ring Tone Generator45158
181Versatile Zener Diode Tester37209
182DTMF Proximity Detector63621
183Under-/Over-Voltage Beep for Manual Stabiliser24969
18415-Step Digital Power Supply62552
185Auto Shut-off For Cassette Players And Amplifiers29342
186House Security System122211
187Generation Of 1-Sec. Pulses Spaced 5-Sec. Apart23112
1889-Line Telephone Sharer62862
189Musical ‘Touch’ Bell52825
190Automatic Heat Detector52688
191Single Phase Electronic Starter29930
192Precision Amplifier With Digital Control38706
193Precision Attenuator With Digital Control25084
194Infrared Electronic Shooting Game15258
195Telephone Ringer Using Timer ICs32178
196Blown Fuse Indicator30679
197Automatic Speed-Controller For Fans and Coolers48895
1982-Line Intercom-Cum-Telephone Line Changeover Circuit34492
199Low-Cost PCO Billing Meter37023
200Telephone Line Based Audio Muting And Light-On Circuit23635
201Power-Supply Failure Alarm44296
202Add-On Stereo Channel Selector24511
203Parallel Telephones With Secrecy31610
204Telephone Number Display63049
205Luggage Security System40961
206Precision Digital AC Power Controller32814
207Phone BroadCaster31350
208Telephone Call Meter Using Calculator And COB30599
209Telephone Conversation Recorder39598
210Universal High-Resistance Voltmeter23226
211Protection For Your Electrical Appliances30467
212Simple Code Lock52528
213Time Switch34362
214Digital Speedometer37543
215Long-Range FM Transmitter201630
216Self-Switching Power Supply30141
217Electrical Equipment Control Using PC77743
218Teleremote Control48542
219Low-Cost Transistorised Intercom34453
220Charge Monitor For 12V Rechargeable Lead-Acid Battery60379
221Cordless Phone Backup28732
222Sleep-Switch Cum Wake-up Timer24908
223Simple Analogue To Digital Converter33789
224Dual-Channel Digital Volume Control32804
225Infrared Cordless Headphone68085
226Magnetic Proximity Switch26812
227Simple Low-Cost Digital Code Lock40551
228Ultra Low Drop Linear Regulator14498
229Simple Sensitive Remote Control Tester16716
230Electronic Scoring Game21604
231Tiny Dew Sensor21882
232Electronic Jam48806
233Precision 1Hz Clock Generator Using Chip-On-Board17717
234Digital Switching System30313
23540-Metre Direct Conversion Receiver27386
236Frequency Measurements Using PC29837
237Contactless AC Mains Voltage Detector18374
238PC-Based 7-Segment Rolling Display28087
239Electronic Card-Lock System54645
240Miniature Strobe Light24866
241Automatic Dual-Output Display17355
242CD-ROM Drive As Digital-Audio CD-Player46359
243Clap Remote27547
244Wiper Speed Controller22271
245Water Level Indicator With Alarm43120
246IC Controlled Emergency Light With Charger45231
247Auto Reset Over/Under Voltage Cut-Out7556
248Smart Phone Light17595
249Automatic Emergency Light30531
250Telecom Headset16696
251Automatic Room Power Control23626
252Handy Zener Diode Tester12959
253Telephone Line Vigilant12603
254High and Low Voltage Cutout With Delay and Melody10685
255Colour Sensor30953
256Running Message Display26436
257Low Current, High Voltage Power Supply14202
258Audio-Visual Extra Ringer For Phone8367
259Solidstate Auto Power-Off/On Mains Failure5976
2607MHz CW/AM QRP Transmitter7925
261Intelligent Switch25553
262Fluid Level Detector17617
263Programmable Door-Bell With Flashing LEDs12966
264Clap Switch22593
265Computerised Morse Code Generator/Transmitter6467
266Accurate Electronic Stop-Watch11037
267Magic Lights27918
268Digital Dice With Numeric Display14250
269Sensitive Temperature Switch14693
270Automatic Temperature Controlled Fan21920
271Watch-Dog for Telephones13994
272FM Transmitter For Channel Changer23129
273UPS For Cordless Telephones25226
274Touch-Sensitive Musical Bell With Timer10772
275Programmable LED Indicator15904
276Economical Pump Controller14212
277Fire Alarm27050
278Short Wave AM Transmitter15262
279Automatic Emergency Torch15817
280Ramp Controlled Light10278
281Simple Intercom Circuit19749
282Tank Overflow Preventer17910
28333-Volt Tunning Voltage11641
284Appliance Timer12707
285Electronic Code Lock25843
286Flashing Brakelight12725
287IR Remote Control29405
288Car Anti-Theft Wireless Alarm23921
289Divide-By-N Counter Realisation Using ICs CD4033 And CD401714090
290Soft Musical Telephone Ringer9400
291Low Cost Transistorised Inverter22894
292Automatic Telephone Answering Machine19594
293Hourly Chime Function Generator10298
294Programmable Priority Time Switch11711
295Digital Volume Control24043
296Extension Phone Switcher9382
297Battery Opeated High Voltage Source15722
298Handy Telephone Receiver15134
299A Highly Efficient DC Lamp Dimmer11976
300Low Cost Automatic Gate LIght With A Musical Bell13975

 
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