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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 Indicator4237
2Versatile Probe1827
3Security System Switcher7087
4Electronic Candles9556
5Pyroelectric Fire Alarm6906
6Telephone Call Recorder9990
7DuoPhone10123
8Mini UPS System17682
9Car-Reversing Horn With Flasher8290
10Short-Circuit Protection in DC Low-Voltage Systems7420
11Inverter for Soldering Iron12405
12Transistorised Logic Probe for TTL5139
13Constant-Current Battery Charger14328
14Multitone Siren10088
15Generator Room Light15382
16Liquid Level Alarm19747
17PC Power Manager13168
18Skin Response Meter19230
19Solar Panel based Charger and Small LED Lamp25950
20Electronic Bicycle Lock21978
21Remote-operated Master Switch20652
22USB Power Socket20165
23Triple Power Supply18883
24Smart Hearing Aid13695
25Midnight Security Light26216
26Automated Alarm Circuits19356
27Traffic Baton18148
28Laser-guided Door Opener28537
29Battery-level Indicator28585
30PC Temperature Controller22445
31Traffic Controller26566
32Night Alert25339
33Muscular Stimulator18768
34Wireless Switch54762
35Long-Range IR Transmitter26358
36Electric Window Fence Charger7279
37Three-Phase Appliance Protector17213
38PC Multimedia Speakers29675
39Aquarium Probe19658
40Bicycle Indicator20989
41Poor Man’s Hearing Aid14331
42Portable Lamp Flasher17214
43Staircase Light With Auto Switch-Off22772
44Car Anti-theft Guard26809
45USB Power Booster30375
46Smart Vibration Sensor24787
47Drinking Water alarm37320
48GLOW PLuG CONTROLLER15341
49Versatile CMOS TTL Logic And Clock Probe11160
50Tester For Remote Control23365
51Automatic Low-Power Emergency Light33638
52Mobile Bug53024
53LED Lighting for Christmas36220
54Current Sensor33001
55Seismic Sensor27734
56Dice With 7-Segment Display24806
57Motorbike Alarm31583
58Laptop Protector53519
59Shutter Guard17133
60Desktop Power Supply27960
61Mobile Shield38915
62Infrared Firecracker Igniter27775
63Automatic Phase Changer28609
64Flying Saucer39294
65Anti-Collision Rear Light26714
66Light Fence28628
67MAT Switch25348
685-Band Graphic Equaliser25093
69Clock Timer38192
70Fully Automatic Emergency Light48334
71IR Music Transmitter and Receiver53436
72Electronic Horn34258
73Ultrasonic Proximity Detector38598
74Secret Bell48201
75Variable Power Supply Using a Fixed-Voltage Regulator IC49321
76Appliance Timer-Cum-Clap Switch25023
77Telephone-Operated Calling System36184
78Front Door Guard38551
79Bell-Cum Light Controller23902
80Friendly Charger for Mobile Phones46802
81Hearing Aid32384
82Speed Control of DC Motor Using Pulse-Width Modulation44742
83Remote-Controlled Fan Regulator72548
84Low-Power Voltage Doubler26781
85Parrot-Sounding AC Doorbell25986
86Multi-Melody Generator With Instrumental Effect19910
87School-College Quiz Buzzer19798
88Visual AC Mains Voltage Indicator24805
89Simple Short-Wave Transmitter25428
90Solar Lighting System74759
91Infrared Bug40285
92Picnic Lamp34494
93Versatile Power Supply32918
94Ultrasonic Proximity Detector40451
95Shadow Alarm48482
96IR Burglar Deterrent58434
97Versatile Water-Level Controller45011
98Automatic-Off Timer For CD Players29514
99Heat-Sensitive Switch33555
100Sensitive Vibration Detector31642
101Digital Dice36260
102Remote-Controlled Power-Off Switch57663
103Little Door Guard39990
104Stress Meter43016
105Teleconferencing System45296
106Medium-Power FM Transmitter47981
107Smart Cellphone Holder39567
108Fuel Reserve Indicator For Vehicles36439
109Brake Failure Indicator42362
110Safety Guard30903
111Mains Supply Failure Alarm32357
112Remote Control For Home Appliances95048
113Micromotor Controller44669
114Solar Bug49228
115Simple Digital Security System53262
116Digital Audio/Video Input Selector21006
117Auto Turn-Off Battery Charger57943
118Atmel AVR ISP Dongle41218
119Audio Amplifier for Personal Stereo52299
120Musical Light Chaser45952
121Water-Level Controller78287
122Hit Switch48383
123Fire Alarm Using Thermistor47378
124Electronic Watchdog66388
125Automatic School Bell42343
126Anti-Theft Alarm For Bikes60740
127DC Motor Control Using A Single Switch47635
128Solidstate Remote Control Switch41386
129Flashing-Cum-Running Light38027
130Quality FM Transmitter85179
131Stabilised Power Supply With Short-Circuit Indication36931
132Digital Stop Watch52963
133Cell-Phone-Controlled Audio/Video Mute Switch47445
134PC-Based DC Motor Speed Controller64025
135Child's Lamp51467
136Watchman Watcher46703
137Highway Alert Signal Lamp35065
138Low-Cost Electronic Quiz Table32786
139Mobile Cellphone Charger86382
140Smart Foot Switch39973
141Programmable Timer for Appliances57972
142Anti-Bag-Snatching Alarm33640
143LED-Based Message Display92200
144Multiband CW Transmitter34782
145Automatic Night Lamp With Morning Alarm66614
146Touch Dimmer63713
147Mosfet-Based Preamplifier for FM Radio DXing43357
148Non-Contact Power Monitor31300
149Remote-Operated Musical Bell49811
150Electronic Motor Starter57958
151Telephone Receiver77322
152Washing Machine Motor Controller52787
153Low-Cost Hearing Aid47622
154Over-Under-Voltage Protection of Electrical Appliances36755
155Parallel Telephone With Secrecy and Call Prevention47244
156Voltage-Based Controller For Switches28552
157DTMF Receiver IC MT8870 Tester61984
158Pulse Generator52164
159Infrared Remote Control Timer57610
160Clap Switch101450
161Multi-Switch Doorbell With Indicators32650
162Song Number Display45852
163Lead-Acid Battery Charger With Voltage Analyser66726
164Electronic Security System152320
165Three-Colour Display Using Bicolour LEDs55076
166Ultra-Bright LED Lamp92117
167Computerised Universal Timer44758
168Number Guessing Game40809
169PC-Based Oscilloscope264874
170Intruder Radio Alert System54268
171Flashing Beacon51693
172Knock Alarm69434
173Automated Traffic Signal Controller82403
174Infrared Toy Car Motor Controller210990
175Mains Manager40164
176Crystal-Controlled Time-Base Generator31195
177Mains Operated Christmas Star34204
178Music On-Hold For Telephones40278
179Solidstate Switch For DC-Operated Gadgets33059
180Ding-Dong Bell76152
181IR Remote Switch106687
182Shortwave Transmitter51086
183FM Booster103823
184Laser Torch-Based Voice Transmitter And Receiver82733
185Mobile Phone Battery Charger80726
186Fastest Finger First Indicator57914
187Condenser Mic Audio Amplifier70264
188DarkRoom Timer44805
189Speller Effect Sign Display36104
190Stereo Tape Head Preamplifier For PC Sound Card42291
191A Hierarchical Priority Encoder27622
192Digital Mains Voltage Indicator50537
193Water-Level Controller95256
194Invisible Broken Wire Detector82555
195Anti-Theft Security For Car Audios50554
196Simple Telephone Ring Tone Generator48853
197Versatile Zener Diode Tester40790
198DTMF Proximity Detector68518
199Under-/Over-Voltage Beep for Manual Stabiliser25251
20015-Step Digital Power Supply68680
201Auto Shut-off For Cassette Players And Amplifiers31851
202House Security System146277
203Generation Of 1-Sec. Pulses Spaced 5-Sec. Apart25746
2049-Line Telephone Sharer67635
205Musical ‘Touch’ Bell57081
206Automatic Heat Detector59683
207Single Phase Electronic Starter33910
208Precision Amplifier With Digital Control42003
209Precision Attenuator With Digital Control27521
210Infrared Electronic Shooting Game19240
211Telephone Ringer Using Timer ICs35444
212Blown Fuse Indicator35163
213Automatic Speed-Controller For Fans and Coolers55864
2142-Line Intercom-Cum-Telephone Line Changeover Circuit37524
215Low-Cost PCO Billing Meter41202
216Telephone Line Based Audio Muting And Light-On Circuit26344
217Power-Supply Failure Alarm49819
218Add-On Stereo Channel Selector26978
219Parallel Telephones With Secrecy34586
220Telephone Number Display70209
221Luggage Security System46460
222Precision Digital AC Power Controller35904
223Phone BroadCaster34892
224Telephone Call Meter Using Calculator And COB34116
225Telephone Conversation Recorder44770
226Universal High-Resistance Voltmeter26057
227Protection For Your Electrical Appliances35628
228Simple Code Lock61554
229Time Switch40052
230Digital Speedometer48552
231Long-Range FM Transmitter225716
232Self-Switching Power Supply34255
233Electrical Equipment Control Using PC84754
234Teleremote Control54145
235Low-Cost Transistorised Intercom38870
236Charge Monitor For 12V Rechargeable Lead-Acid Battery69356
237Cordless Phone Backup32004
238Sleep-Switch Cum Wake-up Timer29175
239Simple Analogue To Digital Converter38477
240Dual-Channel Digital Volume Control36596
241Infrared Cordless Headphone75871
242Magnetic Proximity Switch30720
243Simple Low-Cost Digital Code Lock45804
244Ultra Low Drop Linear Regulator16413
245Simple Sensitive Remote Control Tester19345
246Electronic Scoring Game25904
247Tiny Dew Sensor25923
248Electronic Jam58033
249Precision 1Hz Clock Generator Using Chip-On-Board21142
250Digital Switching System36145
25140-Metre Direct Conversion Receiver32031
252Frequency Measurements Using PC34379
253Contactless AC Mains Voltage Detector21962
254PC-Based 7-Segment Rolling Display33127
255Electronic Card-Lock System63263
256Miniature Strobe Light28722
257Automatic Dual-Output Display20364
258CD-ROM Drive As Digital-Audio CD-Player53731
259Clap Remote34117
260Wiper Speed Controller26405
261Water Level Indicator With Alarm52987
262IC Controlled Emergency Light With Charger52769
263Auto Reset Over/Under Voltage Cut-Out7630
264Smart Phone Light21772
265Automatic Emergency Light39150
266Telecom Headset20763
267Automatic Room Power Control30616
268Handy Zener Diode Tester16516
269Telephone Line Vigilant15373
270High and Low Voltage Cutout With Delay and Melody13330
271Colour Sensor41135
272Running Message Display34758
273Low Current, High Voltage Power Supply18320
274Audio-Visual Extra Ringer For Phone10545
275Solidstate Auto Power-Off/On Mains Failure6055
2767MHz CW/AM QRP Transmitter8000
277Intelligent Switch34712
278Fluid Level Detector22800
279Programmable Door-Bell With Flashing LEDs16672
280Clap Switch32296
281Computerised Morse Code Generator/Transmitter6543
282Accurate Electronic Stop-Watch14549
283Magic Lights39640
284Digital Dice With Numeric Display19009
285Sensitive Temperature Switch19390
286Automatic Temperature Controlled Fan30303
287Watch-Dog for Telephones18870
288FM Transmitter For Channel Changer29848
289UPS For Cordless Telephones31942
290Touch-Sensitive Musical Bell With Timer15082
291Programmable LED Indicator21825
292Economical Pump Controller19594
293Fire Alarm38262
294Short Wave AM Transmitter20134
295Automatic Emergency Torch22869
296Ramp Controlled Light13987
297Simple Intercom Circuit26884
298Tank Overflow Preventer26766
29933-Volt Tunning Voltage15804
300Appliance Timer17414
 
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