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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 Manager1064
2Skin Response Meter1467
3Solar Panel based Charger and Small LED Lamp5506
4Electronic Bicycle Lock3600
5Remote-operated Master Switch6154
6USB Power Socket4978
7Triple Power Supply7213
8Smart Hearing Aid4291
9Midnight Security Light11066
10Automated Alarm Circuits7995
11Traffic Baton8542
12Laser-guided Door Opener12770
13Battery-level Indicator14030
14PC Temperature Controller11068
15Traffic Controller13455
16Night Alert12768
17Muscular Stimulator10199
18Wireless Switch26412
19Long-Range IR Transmitter14896
20Electric Window Fence Charger865
21Three-Phase Appliance Protector10546
22PC Multimedia Speakers18009
23Aquarium Probe12191
24Bicycle Indicator13097
25Poor Man’s Hearing Aid8029
26Portable Lamp Flasher10888
27Staircase Light With Auto Switch-Off14438
28Car Anti-theft Guard16373
29USB Power Booster20910
30Smart Vibration Sensor15718
31Drinking Water alarm23639
32GLOW PLuG CONTROLLER10257
33Versatile CMOS TTL Logic And Clock Probe7434
34Tester For Remote Control16014
35Automatic Low-Power Emergency Light24051
36Mobile Bug34665
37LED Lighting for Christmas23118
38Current Sensor22542
39Seismic Sensor18785
40Dice With 7-Segment Display16423
41Motorbike Alarm22465
42Laptop Protector35105
43Shutter Guard12435
44Desktop Power Supply20690
45Mobile Shield27945
46Infrared Firecracker Igniter20721
47Automatic Phase Changer21101
48Flying Saucer27815
49Anti-Collision Rear Light20346
50Light Fence21692
51MAT Switch18674
525-Band Graphic Equaliser18832
53Clock Timer29021
54Fully Automatic Emergency Light36778
55IR Music Transmitter and Receiver41587
56Electronic Horn25832
57Ultrasonic Proximity Detector30164
58Secret Bell36205
59Variable Power Supply Using a Fixed-Voltage Regulator IC39038
60Appliance Timer-Cum-Clap Switch20572
61Telephone-Operated Calling System28465
62Front Door Guard30222
63Bell-Cum Light Controller19464
64Friendly Charger for Mobile Phones34833
65Hearing Aid25899
66Speed Control of DC Motor Using Pulse-Width Modulation35294
67Remote-Controlled Fan Regulator56468
68Low-Power Voltage Doubler21350
69Parrot-Sounding AC Doorbell20709
70Multi-Melody Generator With Instrumental Effect16133
71School/College Quiz Buzzer13784
72Visual AC Mains Voltage Indicator20220
73Simple Short-Wave Transmitter20952
74Solar Lighting System58831
75Infrared Bug33695
76Picnic Lamp28115
77Versatile Power Supply28206
78Ultrasonic Proximity Detector34508
79Shadow Alarm39393
80IR Burglar Deterrent50744
81Versatile Water-Level Controller36294
82Automatic-Off Timer For CD Players24737
83Heat-Sensitive Switch27801
84Sensitive Vibration Detector26522
85Digital Dice30075
86Remote-Controlled Power-Off Switch48625
87Little Door Guard33916
88Stress Meter34653
89Teleconferencing System38206
90Medium-Power FM Transmitter41213
91Smart Cellphone Holder33724
92Fuel Reserve Indicator For Vehicles30986
93Brake Failure Indicator34796
94Safety Guard25973
95Mains Supply Failure Alarm27512
96Remote Control For Home Appliances78896
97Micromotor Controller38358
98Solar Bug41412
99Simple Digital Security System45687
100Digital Audio/Video Input Selector20928
101Auto Turn-Off Battery Charger48863
102Atmel AVR ISP Dongle34995
103Audio Amplifier for Personal Stereo45753
104Musical Light Chaser39256
105Water-Level Controller66698
106Hit Switch41550
107Fire Alarm Using Thermistor40701
108Electronic Watchdog56126
109Automatic School Bell35842
110Anti-Theft Alarm For Bikes51978
111DC Motor Control Using A Single Switch41372
112Solidstate Remote Control Switch37084
113Flashing-Cum-Running Light33719
114Quality FM Transmitter75385
115Stabilised Power Supply With Short-Circuit Indication33032
116Digital Stop Watch46163
117Cell-Phone-Controlled Audio/Video Mute Switch46317
118PC-Based DC Motor Speed Controller57225
119Child's Lamp44509
120Watchman Watcher40297
121Highway Alert Signal Lamp30683
122Low-Cost Electronic Quiz Table28442
123Mobile Cellphone Charger72280
124Smart Foot Switch35031
125Programmable Timer for Appliances52547
126Anti-Bag-Snatching Alarm29786
127LED-Based Message Display79859
128Multiband CW Transmitter31690
129Automatic Night Lamp With Morning Alarm59240
130Touch Dimmer55689
131Mosfet-Based Preamplifier for FM Radio DXing39313
132Non-Contact Power Monitor28441
133Remote-Operated Musical Bell45707
134Electronic Motor Starter51407
135Telephone Receiver70923
136Washing Machine Motor Controller47476
137Low-Cost Hearing Aid42986
138Over-/Under-Voltage Protection of Electrical Appliances33692
139Parallel Telephone With Secrecy and Call Prevention43440
140Voltage-Based Controller For Switches25926
141DTMF Receiver IC MT8870 Tester57274
142Pulse Generator46477
143Infrared Remote Control Timer53064
144Clap Switch89494
145Multi-Switch Doorbell With Indicators29931
146Song Number Display41108
147Lead-Acid Battery Charger With Voltage Analyser60652
148Electronic Security System128734
149Three-Colour Display Using Bicolour LEDs49783
150Ultra-Bright LED Lamp78278
151Computerised Universal Timer41068
152Number Guessing Game36339
153PC-Based Oscilloscope235865
154Intruder Radio Alert System50270
155Flashing Beacon46880
156Knock Alarm62985
157Automated Traffic Signal Controller74288
158Infrared Toy Car Motor Controller193780
159Mains Manager36910
160Crystal-Controlled Time-Base Generator28676
161Mains Operated Christmas Star31317
162Music On-Hold For Telephones37810
163Solidstate Switch For DC-Operated Gadgets29939
164Ding-Dong Bell68180
165IR Remote Switch96797
166Shortwave Transmitter46792
167FM Booster95191
168Laser Torch-Based Voice Transmitter And Receiver75283
169Mobile Phone Battery Charger69225
170Fastest Finger First Indicator50839
171Condenser Mic Audio Amplifier64127
172DarkRoom Timer39885
173Speller Effect Sign Display32878
174Stereo Tape Head Preamplifier For PC Sound Card38945
175A Hierarchical Priority Encoder24954
176Digital Mains Voltage Indicator45458
177Water-Level Controller83510
178Invisible Broken Wire Detector72942
179Anti-Theft Security For Car Audios46133
180Simple Telephone Ring Tone Generator45161
181Versatile Zener Diode Tester37216
182DTMF Proximity Detector63629
183Under-/Over-Voltage Beep for Manual Stabiliser24971
18415-Step Digital Power Supply62563
185Auto Shut-off For Cassette Players And Amplifiers29345
186House Security System122242
187Generation Of 1-Sec. Pulses Spaced 5-Sec. Apart23116
1889-Line Telephone Sharer62871
189Musical ‘Touch’ Bell52831
190Automatic Heat Detector52697
191Single Phase Electronic Starter29938
192Precision Amplifier With Digital Control38713
193Precision Attenuator With Digital Control25091
194Infrared Electronic Shooting Game15262
195Telephone Ringer Using Timer ICs32181
196Blown Fuse Indicator30692
197Automatic Speed-Controller For Fans and Coolers48905
1982-Line Intercom-Cum-Telephone Line Changeover Circuit34496
199Low-Cost PCO Billing Meter37031
200Telephone Line Based Audio Muting And Light-On Circuit23643
201Power-Supply Failure Alarm44301
202Add-On Stereo Channel Selector24515
203Parallel Telephones With Secrecy31616
204Telephone Number Display63058
205Luggage Security System40969
206Precision Digital AC Power Controller32819
207Phone BroadCaster31355
208Telephone Call Meter Using Calculator And COB30603
209Telephone Conversation Recorder39610
210Universal High-Resistance Voltmeter23231
211Protection For Your Electrical Appliances30476
212Simple Code Lock52543
213Time Switch34372
214Digital Speedometer37555
215Long-Range FM Transmitter201662
216Self-Switching Power Supply30148
217Electrical Equipment Control Using PC77754
218Teleremote Control48549
219Low-Cost Transistorised Intercom34461
220Charge Monitor For 12V Rechargeable Lead-Acid Battery60392
221Cordless Phone Backup28736
222Sleep-Switch Cum Wake-up Timer24913
223Simple Analogue To Digital Converter33793
224Dual-Channel Digital Volume Control32809
225Infrared Cordless Headphone68093
226Magnetic Proximity Switch26817
227Simple Low-Cost Digital Code Lock40556
228Ultra Low Drop Linear Regulator14503
229Simple Sensitive Remote Control Tester16719
230Electronic Scoring Game21610
231Tiny Dew Sensor21889
232Electronic Jam48816
233Precision 1Hz Clock Generator Using Chip-On-Board17721
234Digital Switching System30323
23540-Metre Direct Conversion Receiver27397
236Frequency Measurements Using PC29843
237Contactless AC Mains Voltage Detector18379
238PC-Based 7-Segment Rolling Display28098
239Electronic Card-Lock System54660
240Miniature Strobe Light24874
241Automatic Dual-Output Display17362
242CD-ROM Drive As Digital-Audio CD-Player46371
243Clap Remote27554
244Wiper Speed Controller22274
245Water Level Indicator With Alarm43138
246IC Controlled Emergency Light With Charger45243
247Auto Reset Over/Under Voltage Cut-Out7557
248Smart Phone Light17601
249Automatic Emergency Light30540
250Telecom Headset16703
251Automatic Room Power Control23633
252Handy Zener Diode Tester12964
253Telephone Line Vigilant12609
254High and Low Voltage Cutout With Delay and Melody10689
255Colour Sensor30967
256Running Message Display26445
257Low Current, High Voltage Power Supply14208
258Audio-Visual Extra Ringer For Phone8371
259Solidstate Auto Power-Off/On Mains Failure5977
2607MHz CW/AM QRP Transmitter7926
261Intelligent Switch25564
262Fluid Level Detector17622
263Programmable Door-Bell With Flashing LEDs12970
264Clap Switch22605
265Computerised Morse Code Generator/Transmitter6468
266Accurate Electronic Stop-Watch11041
267Magic Lights27929
268Digital Dice With Numeric Display14256
269Sensitive Temperature Switch14700
270Automatic Temperature Controlled Fan21927
271Watch-Dog for Telephones13998
272FM Transmitter For Channel Changer23133
273UPS For Cordless Telephones25235
274Touch-Sensitive Musical Bell With Timer10776
275Programmable LED Indicator15913
276Economical Pump Controller14218
277Fire Alarm27060
278Short Wave AM Transmitter15268
279Automatic Emergency Torch15825
280Ramp Controlled Light10283
281Simple Intercom Circuit19756
282Tank Overflow Preventer17919
28333-Volt Tunning Voltage11648
284Appliance Timer12713
285Electronic Code Lock25858
286Flashing Brakelight12734
287IR Remote Control29424
288Car Anti-Theft Wireless Alarm23933
289Divide-By-N Counter Realisation Using ICs CD4033 And CD401714097
290Soft Musical Telephone Ringer9405
291Low Cost Transistorised Inverter22905
292Automatic Telephone Answering Machine19601
293Hourly Chime Function Generator10303
294Programmable Priority Time Switch11716
295Digital Volume Control24056
296Extension Phone Switcher9385
297Battery Opeated High Voltage Source15730
298Handy Telephone Receiver15142
299A Highly Efficient DC Lamp Dimmer11983
300Low Cost Automatic Gate LIght With A Musical Bell13991

 
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