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Latest Issues


   C I R C U I T     L A B

 

1)  Antisleep Alarm for Students (New)
2)  Four-Stage FM Transmitter (New)

Click to view in order of 'highest hits first'
S No.Circuit NameHits
1Numeric Water-level Indicator4768
2Versatile Probe1969
3Security System Switcher7332
4Electronic Candles10014
5Pyroelectric Fire Alarm7063
6Telephone Call Recorder10257
7DuoPhone10319
8Mini UPS System18146
9Car-Reversing Horn With Flasher8419
10Short-Circuit Protection in DC Low-Voltage Systems7562
11Inverter for Soldering Iron12583
12Transistorised Logic Probe for TTL5195
13Constant-Current Battery Charger14479
14Multitone Siren10217
15Generator Room Light15572
16Liquid Level Alarm19965
17PC Power Manager13276
18Skin Response Meter19451
19Solar Panel based Charger and Small LED Lamp26225
20Electronic Bicycle Lock22213
21Remote-operated Master Switch20851
22USB Power Socket20381
23Triple Power Supply19032
24Smart Hearing Aid13820
25Midnight Security Light26386
26Automated Alarm Circuits19490
27Traffic Baton18284
28Laser-guided Door Opener28774
29Battery-level Indicator28766
30PC Temperature Controller22591
31Traffic Controller26732
32Night Alert25488
33Muscular Stimulator18885
34Wireless Switch55226
35Long-Range IR Transmitter26524
36Electric Window Fence Charger7360
37Three-Phase Appliance Protector17293
38PC Multimedia Speakers29822
39Aquarium Probe19734
40Bicycle Indicator21083
41Poor Man’s Hearing Aid14413
42Portable Lamp Flasher17293
43Staircase Light With Auto Switch-Off22879
44Car Anti-theft Guard26966
45USB Power Booster30504
46Smart Vibration Sensor24899
47Drinking Water alarm37482
48GLOW PLuG CONTROLLER15405
49Versatile CMOS TTL Logic And Clock Probe11204
50Tester For Remote Control23454
51Automatic Low-Power Emergency Light33760
52Mobile Bug53253
53LED Lighting for Christmas36382
54Current Sensor33136
55Seismic Sensor27859
56Dice With 7-Segment Display24907
57Motorbike Alarm31704
58Laptop Protector53791
59Shutter Guard17185
60Desktop Power Supply28046
61Mobile Shield39065
62Infrared Firecracker Igniter27861
63Automatic Phase Changer28707
64Flying Saucer39458
65Anti-Collision Rear Light26795
66Light Fence28712
67MAT Switch25430
685-Band Graphic Equaliser25164
69Clock Timer38304
70Fully Automatic Emergency Light48492
71IR Music Transmitter and Receiver53619
72Electronic Horn34357
73Ultrasonic Proximity Detector38718
74Secret Bell48345
75Variable Power Supply Using a Fixed-Voltage Regulator IC49502
76Appliance Timer-Cum-Clap Switch25090
77Telephone-Operated Calling System36281
78Front Door Guard38678
79Bell-Cum Light Controller23949
80Friendly Charger for Mobile Phones46964
81Hearing Aid32456
82Speed Control of DC Motor Using Pulse-Width Modulation44883
83Remote-Controlled Fan Regulator72826
84Low-Power Voltage Doubler26846
85Parrot-Sounding AC Doorbell26046
86Multi-Melody Generator With Instrumental Effect19948
87School-College Quiz Buzzer19879
88Visual AC Mains Voltage Indicator24860
89Simple Short-Wave Transmitter25485
90Solar Lighting System74970
91Infrared Bug40384
92Picnic Lamp34571
93Versatile Power Supply32989
94Ultrasonic Proximity Detector40538
95Shadow Alarm48618
96IR Burglar Deterrent58547
97Versatile Water-Level Controller45134
98Automatic-Off Timer For CD Players29577
99Heat-Sensitive Switch33632
100Sensitive Vibration Detector31706
101Digital Dice36342
102Remote-Controlled Power-Off Switch57804
103Little Door Guard40066
104Stress Meter43133
105Teleconferencing System45380
106Medium-Power FM Transmitter48069
107Smart Cellphone Holder39645
108Fuel Reserve Indicator For Vehicles36518
109Brake Failure Indicator42451
110Safety Guard30970
111Mains Supply Failure Alarm32420
112Remote Control For Home Appliances95280
113Micromotor Controller44754
114Solar Bug49338
115Simple Digital Security System53357
116Digital Audio/Video Input Selector21006
117Auto Turn-Off Battery Charger58074
118Atmel AVR ISP Dongle41308
119Audio Amplifier for Personal Stereo52388
120Musical Light Chaser46035
121Water-Level Controller78440
122Hit Switch48466
123Fire Alarm Using Thermistor47467
124Electronic Watchdog66554
125Automatic School Bell42424
126Anti-Theft Alarm For Bikes60867
127DC Motor Control Using A Single Switch47726
128Solidstate Remote Control Switch41452
129Flashing-Cum-Running Light38076
130Quality FM Transmitter85324
131Stabilised Power Supply With Short-Circuit Indication36985
132Digital Stop Watch53032
133Cell-Phone-Controlled Audio/Video Mute Switch47458
134PC-Based DC Motor Speed Controller64126
135Child's Lamp51540
136Watchman Watcher46789
137Highway Alert Signal Lamp35122
138Low-Cost Electronic Quiz Table32857
139Mobile Cellphone Charger86592
140Smart Foot Switch40044
141Programmable Timer for Appliances58041
142Anti-Bag-Snatching Alarm33687
143LED-Based Message Display92370
144Multiband CW Transmitter34829
145Automatic Night Lamp With Morning Alarm66715
146Touch Dimmer63810
147Mosfet-Based Preamplifier for FM Radio DXing43406
148Non-Contact Power Monitor31333
149Remote-Operated Musical Bell49870
150Electronic Motor Starter58052
151Telephone Receiver77418
152Washing Machine Motor Controller52851
153Low-Cost Hearing Aid47680
154Over-Under-Voltage Protection of Electrical Appliances36809
155Parallel Telephone With Secrecy and Call Prevention47282
156Voltage-Based Controller For Switches28589
157DTMF Receiver IC MT8870 Tester62049
158Pulse Generator52245
159Infrared Remote Control Timer57694
160Clap Switch101637
161Multi-Switch Doorbell With Indicators32690
162Song Number Display45924
163Lead-Acid Battery Charger With Voltage Analyser66804
164Electronic Security System152656
165Three-Colour Display Using Bicolour LEDs55147
166Ultra-Bright LED Lamp92296
167Computerised Universal Timer44803
168Number Guessing Game40869
169PC-Based Oscilloscope265314
170Intruder Radio Alert System54326
171Flashing Beacon51745
172Knock Alarm69513
173Automated Traffic Signal Controller82501
174Infrared Toy Car Motor Controller211276
175Mains Manager40205
176Crystal-Controlled Time-Base Generator31227
177Mains Operated Christmas Star34247
178Music On-Hold For Telephones40309
179Solidstate Switch For DC-Operated Gadgets33094
180Ding-Dong Bell76245
181IR Remote Switch106852
182Shortwave Transmitter51154
183FM Booster103947
184Laser Torch-Based Voice Transmitter And Receiver82841
185Mobile Phone Battery Charger80889
186Fastest Finger First Indicator58031
187Condenser Mic Audio Amplifier70353
188DarkRoom Timer44870
189Speller Effect Sign Display36147
190Stereo Tape Head Preamplifier For PC Sound Card42326
191A Hierarchical Priority Encoder27649
192Digital Mains Voltage Indicator50608
193Water-Level Controller95403
194Invisible Broken Wire Detector82684
195Anti-Theft Security For Car Audios50615
196Simple Telephone Ring Tone Generator48906
197Versatile Zener Diode Tester40830
198DTMF Proximity Detector68585
199Under-/Over-Voltage Beep for Manual Stabiliser25252
20015-Step Digital Power Supply68762
201Auto Shut-off For Cassette Players And Amplifiers31883
202House Security System146653
203Generation Of 1-Sec. Pulses Spaced 5-Sec. Apart25781
2049-Line Telephone Sharer67699
205Musical ‘Touch’ Bell57156
206Automatic Heat Detector59781
207Single Phase Electronic Starter33954
208Precision Amplifier With Digital Control42044
209Precision Attenuator With Digital Control27547
210Infrared Electronic Shooting Game19294
211Telephone Ringer Using Timer ICs35502
212Blown Fuse Indicator35231
213Automatic Speed-Controller For Fans and Coolers55980
2142-Line Intercom-Cum-Telephone Line Changeover Circuit37567
215Low-Cost PCO Billing Meter41254
216Telephone Line Based Audio Muting And Light-On Circuit26365
217Power-Supply Failure Alarm49895
218Add-On Stereo Channel Selector27007
219Parallel Telephones With Secrecy34635
220Telephone Number Display70313
221Luggage Security System46552
222Precision Digital AC Power Controller35946
223Phone BroadCaster34946
224Telephone Call Meter Using Calculator And COB34159
225Telephone Conversation Recorder44837
226Universal High-Resistance Voltmeter26099
227Protection For Your Electrical Appliances35682
228Simple Code Lock61679
229Time Switch40128
230Digital Speedometer48727
231Long-Range FM Transmitter226036
232Self-Switching Power Supply34318
233Electrical Equipment Control Using PC84860
234Teleremote Control54255
235Low-Cost Transistorised Intercom38932
236Charge Monitor For 12V Rechargeable Lead-Acid Battery69487
237Cordless Phone Backup32050
238Sleep-Switch Cum Wake-up Timer29238
239Simple Analogue To Digital Converter38553
240Dual-Channel Digital Volume Control36647
241Infrared Cordless Headphone75995
242Magnetic Proximity Switch30779
243Simple Low-Cost Digital Code Lock45891
244Ultra Low Drop Linear Regulator16444
245Simple Sensitive Remote Control Tester19385
246Electronic Scoring Game25970
247Tiny Dew Sensor25991
248Electronic Jam58182
249Precision 1Hz Clock Generator Using Chip-On-Board21187
250Digital Switching System36222
25140-Metre Direct Conversion Receiver32107
252Frequency Measurements Using PC34436
253Contactless AC Mains Voltage Detector22009
254PC-Based 7-Segment Rolling Display33210
255Electronic Card-Lock System63394
256Miniature Strobe Light28781
257Automatic Dual-Output Display20408
258CD-ROM Drive As Digital-Audio CD-Player53833
259Clap Remote34222
260Wiper Speed Controller26465
261Water Level Indicator With Alarm53128
262IC Controlled Emergency Light With Charger52886
263Auto Reset Over/Under Voltage Cut-Out7630
264Smart Phone Light21832
265Automatic Emergency Light39273
266Telecom Headset20823
267Automatic Room Power Control30728
268Handy Zener Diode Tester16569
269Telephone Line Vigilant15407
270High and Low Voltage Cutout With Delay and Melody13365
271Colour Sensor41322
272Running Message Display34915
273Low Current, High Voltage Power Supply18375
274Audio-Visual Extra Ringer For Phone10581
275Solidstate Auto Power-Off/On Mains Failure6055
2767MHz CW/AM QRP Transmitter8000
277Intelligent Switch34858
278Fluid Level Detector22873
279Programmable Door-Bell With Flashing LEDs16722
280Clap Switch32469
281Computerised Morse Code Generator/Transmitter6543
282Accurate Electronic Stop-Watch14609
283Magic Lights39836
284Digital Dice With Numeric Display19080
285Sensitive Temperature Switch19471
286Automatic Temperature Controlled Fan30455
287Watch-Dog for Telephones18942
288FM Transmitter For Channel Changer29958
289UPS For Cordless Telephones32030
290Touch-Sensitive Musical Bell With Timer15181
291Programmable LED Indicator21925
292Economical Pump Controller19695
293Fire Alarm38467
294Short Wave AM Transmitter20214
295Automatic Emergency Torch23000
296Ramp Controlled Light14040
297Simple Intercom Circuit27016
298Tank Overflow Preventer26924
29933-Volt Tunning Voltage15884
300Appliance Timer17542
 
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