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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 Indicator4858
2Versatile Probe1992
3Security System Switcher7370
4Electronic Candles10094
5Pyroelectric Fire Alarm7089
6Telephone Call Recorder10302
7DuoPhone10357
8Mini UPS System18211
9Car-Reversing Horn With Flasher8445
10Short-Circuit Protection in DC Low-Voltage Systems7586
11Inverter for Soldering Iron12611
12Transistorised Logic Probe for TTL5205
13Constant-Current Battery Charger14509
14Multitone Siren10243
15Generator Room Light15596
16Liquid Level Alarm20003
17PC Power Manager13293
18Skin Response Meter19493
19Solar Panel based Charger and Small LED Lamp26262
20Electronic Bicycle Lock22262
21Remote-operated Master Switch20878
22USB Power Socket20406
23Triple Power Supply19053
24Smart Hearing Aid13836
25Midnight Security Light26416
26Automated Alarm Circuits19514
27Traffic Baton18303
28Laser-guided Door Opener28817
29Battery-level Indicator28798
30PC Temperature Controller22615
31Traffic Controller26767
32Night Alert25528
33Muscular Stimulator18906
34Wireless Switch55314
35Long-Range IR Transmitter26559
36Electric Window Fence Charger7374
37Three-Phase Appliance Protector17303
38PC Multimedia Speakers29842
39Aquarium Probe19745
40Bicycle Indicator21099
41Poor Man’s Hearing Aid14425
42Portable Lamp Flasher17304
43Staircase Light With Auto Switch-Off22900
44Car Anti-theft Guard26988
45USB Power Booster30516
46Smart Vibration Sensor24914
47Drinking Water alarm37503
48GLOW PLuG CONTROLLER15417
49Versatile CMOS TTL Logic And Clock Probe11209
50Tester For Remote Control23466
51Automatic Low-Power Emergency Light33775
52Mobile Bug53305
53LED Lighting for Christmas36408
54Current Sensor33159
55Seismic Sensor27877
56Dice With 7-Segment Display24926
57Motorbike Alarm31730
58Laptop Protector53835
59Shutter Guard17195
60Desktop Power Supply28054
61Mobile Shield39081
62Infrared Firecracker Igniter27877
63Automatic Phase Changer28721
64Flying Saucer39493
65Anti-Collision Rear Light26804
66Light Fence28734
67MAT Switch25444
685-Band Graphic Equaliser25179
69Clock Timer38318
70Fully Automatic Emergency Light48510
71IR Music Transmitter and Receiver53657
72Electronic Horn34372
73Ultrasonic Proximity Detector38743
74Secret Bell48373
75Variable Power Supply Using a Fixed-Voltage Regulator IC49532
76Appliance Timer-Cum-Clap Switch25104
77Telephone-Operated Calling System36297
78Front Door Guard38694
79Bell-Cum Light Controller23959
80Friendly Charger for Mobile Phones47003
81Hearing Aid32467
82Speed Control of DC Motor Using Pulse-Width Modulation44919
83Remote-Controlled Fan Regulator72879
84Low-Power Voltage Doubler26859
85Parrot-Sounding AC Doorbell26053
86Multi-Melody Generator With Instrumental Effect19955
87School-College Quiz Buzzer19891
88Visual AC Mains Voltage Indicator24867
89Simple Short-Wave Transmitter25491
90Solar Lighting System75003
91Infrared Bug40401
92Picnic Lamp34579
93Versatile Power Supply32994
94Ultrasonic Proximity Detector40549
95Shadow Alarm48641
96IR Burglar Deterrent58563
97Versatile Water-Level Controller45149
98Automatic-Off Timer For CD Players29581
99Heat-Sensitive Switch33648
100Sensitive Vibration Detector31731
101Digital Dice36361
102Remote-Controlled Power-Off Switch57831
103Little Door Guard40081
104Stress Meter43164
105Teleconferencing System45410
106Medium-Power FM Transmitter48096
107Smart Cellphone Holder39655
108Fuel Reserve Indicator For Vehicles36532
109Brake Failure Indicator42479
110Safety Guard30982
111Mains Supply Failure Alarm32430
112Remote Control For Home Appliances95317
113Micromotor Controller44772
114Solar Bug49361
115Simple Digital Security System53369
116Digital Audio/Video Input Selector21006
117Auto Turn-Off Battery Charger58095
118Atmel AVR ISP Dongle41321
119Audio Amplifier for Personal Stereo52402
120Musical Light Chaser46051
121Water-Level Controller78471
122Hit Switch48478
123Fire Alarm Using Thermistor47478
124Electronic Watchdog66586
125Automatic School Bell42444
126Anti-Theft Alarm For Bikes60891
127DC Motor Control Using A Single Switch47742
128Solidstate Remote Control Switch41464
129Flashing-Cum-Running Light38086
130Quality FM Transmitter85348
131Stabilised Power Supply With Short-Circuit Indication37010
132Digital Stop Watch53051
133Cell-Phone-Controlled Audio/Video Mute Switch47458
134PC-Based DC Motor Speed Controller64146
135Child's Lamp51556
136Watchman Watcher46798
137Highway Alert Signal Lamp35135
138Low-Cost Electronic Quiz Table32863
139Mobile Cellphone Charger86627
140Smart Foot Switch40061
141Programmable Timer for Appliances58051
142Anti-Bag-Snatching Alarm33695
143LED-Based Message Display92396
144Multiband CW Transmitter34837
145Automatic Night Lamp With Morning Alarm66737
146Touch Dimmer63827
147Mosfet-Based Preamplifier for FM Radio DXing43412
148Non-Contact Power Monitor31341
149Remote-Operated Musical Bell49878
150Electronic Motor Starter58067
151Telephone Receiver77444
152Washing Machine Motor Controller52867
153Low-Cost Hearing Aid47688
154Over-Under-Voltage Protection of Electrical Appliances36815
155Parallel Telephone With Secrecy and Call Prevention47289
156Voltage-Based Controller For Switches28592
157DTMF Receiver IC MT8870 Tester62058
158Pulse Generator52257
159Infrared Remote Control Timer57705
160Clap Switch101665
161Multi-Switch Doorbell With Indicators32698
162Song Number Display45933
163Lead-Acid Battery Charger With Voltage Analyser66819
164Electronic Security System152711
165Three-Colour Display Using Bicolour LEDs55155
166Ultra-Bright LED Lamp92332
167Computerised Universal Timer44807
168Number Guessing Game40881
169PC-Based Oscilloscope265362
170Intruder Radio Alert System54335
171Flashing Beacon51758
172Knock Alarm69528
173Automated Traffic Signal Controller82524
174Infrared Toy Car Motor Controller211319
175Mains Manager40208
176Crystal-Controlled Time-Base Generator31230
177Mains Operated Christmas Star34253
178Music On-Hold For Telephones40313
179Solidstate Switch For DC-Operated Gadgets33098
180Ding-Dong Bell76264
181IR Remote Switch106882
182Shortwave Transmitter51164
183FM Booster103975
184Laser Torch-Based Voice Transmitter And Receiver82855
185Mobile Phone Battery Charger80918
186Fastest Finger First Indicator58046
187Condenser Mic Audio Amplifier70362
188DarkRoom Timer44883
189Speller Effect Sign Display36153
190Stereo Tape Head Preamplifier For PC Sound Card42331
191A Hierarchical Priority Encoder27656
192Digital Mains Voltage Indicator50616
193Water-Level Controller95420
194Invisible Broken Wire Detector82712
195Anti-Theft Security For Car Audios50626
196Simple Telephone Ring Tone Generator48915
197Versatile Zener Diode Tester40837
198DTMF Proximity Detector68598
199Under-/Over-Voltage Beep for Manual Stabiliser25253
20015-Step Digital Power Supply68774
201Auto Shut-off For Cassette Players And Amplifiers31883
202House Security System146723
203Generation Of 1-Sec. Pulses Spaced 5-Sec. Apart25785
2049-Line Telephone Sharer67707
205Musical ‘Touch’ Bell57167
206Automatic Heat Detector59796
207Single Phase Electronic Starter33962
208Precision Amplifier With Digital Control42051
209Precision Attenuator With Digital Control27550
210Infrared Electronic Shooting Game19304
211Telephone Ringer Using Timer ICs35508
212Blown Fuse Indicator35240
213Automatic Speed-Controller For Fans and Coolers56006
2142-Line Intercom-Cum-Telephone Line Changeover Circuit37576
215Low-Cost PCO Billing Meter41258
216Telephone Line Based Audio Muting And Light-On Circuit26368
217Power-Supply Failure Alarm49904
218Add-On Stereo Channel Selector27011
219Parallel Telephones With Secrecy34645
220Telephone Number Display70327
221Luggage Security System46564
222Precision Digital AC Power Controller35951
223Phone BroadCaster34950
224Telephone Call Meter Using Calculator And COB34162
225Telephone Conversation Recorder44847
226Universal High-Resistance Voltmeter26104
227Protection For Your Electrical Appliances35702
228Simple Code Lock61704
229Time Switch40136
230Digital Speedometer48747
231Long-Range FM Transmitter226098
232Self-Switching Power Supply34326
233Electrical Equipment Control Using PC84879
234Teleremote Control54270
235Low-Cost Transistorised Intercom38943
236Charge Monitor For 12V Rechargeable Lead-Acid Battery69504
237Cordless Phone Backup32055
238Sleep-Switch Cum Wake-up Timer29246
239Simple Analogue To Digital Converter38564
240Dual-Channel Digital Volume Control36651
241Infrared Cordless Headphone76017
242Magnetic Proximity Switch30787
243Simple Low-Cost Digital Code Lock45901
244Ultra Low Drop Linear Regulator16446
245Simple Sensitive Remote Control Tester19389
246Electronic Scoring Game25977
247Tiny Dew Sensor26001
248Electronic Jam58200
249Precision 1Hz Clock Generator Using Chip-On-Board21190
250Digital Switching System36234
25140-Metre Direct Conversion Receiver32120
252Frequency Measurements Using PC34446
253Contactless AC Mains Voltage Detector22016
254PC-Based 7-Segment Rolling Display33223
255Electronic Card-Lock System63424
256Miniature Strobe Light28786
257Automatic Dual-Output Display20411
258CD-ROM Drive As Digital-Audio CD-Player53850
259Clap Remote34241
260Wiper Speed Controller26473
261Water Level Indicator With Alarm53158
262IC Controlled Emergency Light With Charger52903
263Auto Reset Over/Under Voltage Cut-Out7630
264Smart Phone Light21836
265Automatic Emergency Light39295
266Telecom Headset20831
267Automatic Room Power Control30743
268Handy Zener Diode Tester16573
269Telephone Line Vigilant15412
270High and Low Voltage Cutout With Delay and Melody13373
271Colour Sensor41349
272Running Message Display34938
273Low Current, High Voltage Power Supply18384
274Audio-Visual Extra Ringer For Phone10584
275Solidstate Auto Power-Off/On Mains Failure6055
2767MHz CW/AM QRP Transmitter8000
277Intelligent Switch34875
278Fluid Level Detector22884
279Programmable Door-Bell With Flashing LEDs16730
280Clap Switch32486
281Computerised Morse Code Generator/Transmitter6543
282Accurate Electronic Stop-Watch14616
283Magic Lights39871
284Digital Dice With Numeric Display19091
285Sensitive Temperature Switch19479
286Automatic Temperature Controlled Fan30475
287Watch-Dog for Telephones18952
288FM Transmitter For Channel Changer29975
289UPS For Cordless Telephones32040
290Touch-Sensitive Musical Bell With Timer15194
291Programmable LED Indicator21941
292Economical Pump Controller19708
293Fire Alarm38491
294Short Wave AM Transmitter20231
295Automatic Emergency Torch23027
296Ramp Controlled Light14050
297Simple Intercom Circuit27041
298Tank Overflow Preventer26956
29933-Volt Tunning Voltage15892
300Appliance Timer17559
 
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