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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 Indicator4723
2Versatile Probe1956
3Security System Switcher7304
4Electronic Candles9971
5Pyroelectric Fire Alarm7045
6Telephone Call Recorder10238
7DuoPhone10302
8Mini UPS System18112
9Car-Reversing Horn With Flasher8406
10Short-Circuit Protection in DC Low-Voltage Systems7548
11Inverter for Soldering Iron12564
12Transistorised Logic Probe for TTL5187
13Constant-Current Battery Charger14466
14Multitone Siren10208
15Generator Room Light15557
16Liquid Level Alarm19943
17PC Power Manager13266
18Skin Response Meter19430
19Solar Panel based Charger and Small LED Lamp26204
20Electronic Bicycle Lock22194
21Remote-operated Master Switch20833
22USB Power Socket20363
23Triple Power Supply19014
24Smart Hearing Aid13812
25Midnight Security Light26370
26Automated Alarm Circuits19475
27Traffic Baton18274
28Laser-guided Door Opener28759
29Battery-level Indicator28746
30PC Temperature Controller22580
31Traffic Controller26717
32Night Alert25478
33Muscular Stimulator18877
34Wireless Switch55191
35Long-Range IR Transmitter26509
36Electric Window Fence Charger7349
37Three-Phase Appliance Protector17288
38PC Multimedia Speakers29808
39Aquarium Probe19727
40Bicycle Indicator21075
41Poor Man’s Hearing Aid14405
42Portable Lamp Flasher17285
43Staircase Light With Auto Switch-Off22870
44Car Anti-theft Guard26955
45USB Power Booster30490
46Smart Vibration Sensor24888
47Drinking Water alarm37471
48GLOW PLuG CONTROLLER15395
49Versatile CMOS TTL Logic And Clock Probe11200
50Tester For Remote Control23444
51Automatic Low-Power Emergency Light33744
52Mobile Bug53239
53LED Lighting for Christmas36353
54Current Sensor33119
55Seismic Sensor27848
56Dice With 7-Segment Display24896
57Motorbike Alarm31689
58Laptop Protector53766
59Shutter Guard17182
60Desktop Power Supply28038
61Mobile Shield39057
62Infrared Firecracker Igniter27852
63Automatic Phase Changer28696
64Flying Saucer39447
65Anti-Collision Rear Light26783
66Light Fence28704
67MAT Switch25426
685-Band Graphic Equaliser25154
69Clock Timer38294
70Fully Automatic Emergency Light48478
71IR Music Transmitter and Receiver53606
72Electronic Horn34349
73Ultrasonic Proximity Detector38706
74Secret Bell48330
75Variable Power Supply Using a Fixed-Voltage Regulator IC49486
76Appliance Timer-Cum-Clap Switch25084
77Telephone-Operated Calling System36275
78Front Door Guard38674
79Bell-Cum Light Controller23946
80Friendly Charger for Mobile Phones46944
81Hearing Aid32451
82Speed Control of DC Motor Using Pulse-Width Modulation44875
83Remote-Controlled Fan Regulator72801
84Low-Power Voltage Doubler26843
85Parrot-Sounding AC Doorbell26039
86Multi-Melody Generator With Instrumental Effect19943
87School-College Quiz Buzzer19874
88Visual AC Mains Voltage Indicator24857
89Simple Short-Wave Transmitter25482
90Solar Lighting System74954
91Infrared Bug40379
92Picnic Lamp34563
93Versatile Power Supply32981
94Ultrasonic Proximity Detector40528
95Shadow Alarm48609
96IR Burglar Deterrent58540
97Versatile Water-Level Controller45122
98Automatic-Off Timer For CD Players29570
99Heat-Sensitive Switch33623
100Sensitive Vibration Detector31704
101Digital Dice36337
102Remote-Controlled Power-Off Switch57790
103Little Door Guard40065
104Stress Meter43123
105Teleconferencing System45378
106Medium-Power FM Transmitter48058
107Smart Cellphone Holder39641
108Fuel Reserve Indicator For Vehicles36514
109Brake Failure Indicator42447
110Safety Guard30965
111Mains Supply Failure Alarm32413
112Remote Control For Home Appliances95265
113Micromotor Controller44749
114Solar Bug49331
115Simple Digital Security System53350
116Digital Audio/Video Input Selector21006
117Auto Turn-Off Battery Charger58065
118Atmel AVR ISP Dongle41300
119Audio Amplifier for Personal Stereo52386
120Musical Light Chaser46029
121Water-Level Controller78423
122Hit Switch48462
123Fire Alarm Using Thermistor47456
124Electronic Watchdog66543
125Automatic School Bell42418
126Anti-Theft Alarm For Bikes60857
127DC Motor Control Using A Single Switch47720
128Solidstate Remote Control Switch41445
129Flashing-Cum-Running Light38073
130Quality FM Transmitter85309
131Stabilised Power Supply With Short-Circuit Indication36981
132Digital Stop Watch53030
133Cell-Phone-Controlled Audio/Video Mute Switch47457
134PC-Based DC Motor Speed Controller64118
135Child's Lamp51534
136Watchman Watcher46783
137Highway Alert Signal Lamp35117
138Low-Cost Electronic Quiz Table32851
139Mobile Cellphone Charger86566
140Smart Foot Switch40038
141Programmable Timer for Appliances58033
142Anti-Bag-Snatching Alarm33686
143LED-Based Message Display92348
144Multiband CW Transmitter34824
145Automatic Night Lamp With Morning Alarm66706
146Touch Dimmer63800
147Mosfet-Based Preamplifier for FM Radio DXing43399
148Non-Contact Power Monitor31328
149Remote-Operated Musical Bell49868
150Electronic Motor Starter58042
151Telephone Receiver77406
152Washing Machine Motor Controller52846
153Low-Cost Hearing Aid47676
154Over-Under-Voltage Protection of Electrical Appliances36807
155Parallel Telephone With Secrecy and Call Prevention47280
156Voltage-Based Controller For Switches28589
157DTMF Receiver IC MT8870 Tester62043
158Pulse Generator52242
159Infrared Remote Control Timer57685
160Clap Switch101624
161Multi-Switch Doorbell With Indicators32687
162Song Number Display45915
163Lead-Acid Battery Charger With Voltage Analyser66792
164Electronic Security System152627
165Three-Colour Display Using Bicolour LEDs55142
166Ultra-Bright LED Lamp92281
167Computerised Universal Timer44800
168Number Guessing Game40859
169PC-Based Oscilloscope265269
170Intruder Radio Alert System54320
171Flashing Beacon51741
172Knock Alarm69502
173Automated Traffic Signal Controller82491
174Infrared Toy Car Motor Controller211252
175Mains Manager40205
176Crystal-Controlled Time-Base Generator31224
177Mains Operated Christmas Star34242
178Music On-Hold For Telephones40308
179Solidstate Switch For DC-Operated Gadgets33092
180Ding-Dong Bell76238
181IR Remote Switch106833
182Shortwave Transmitter51145
183FM Booster103938
184Laser Torch-Based Voice Transmitter And Receiver82833
185Mobile Phone Battery Charger80878
186Fastest Finger First Indicator58020
187Condenser Mic Audio Amplifier70346
188DarkRoom Timer44868
189Speller Effect Sign Display36143
190Stereo Tape Head Preamplifier For PC Sound Card42325
191A Hierarchical Priority Encoder27647
192Digital Mains Voltage Indicator50602
193Water-Level Controller95398
194Invisible Broken Wire Detector82671
195Anti-Theft Security For Car Audios50612
196Simple Telephone Ring Tone Generator48901
197Versatile Zener Diode Tester40827
198DTMF Proximity Detector68577
199Under-/Over-Voltage Beep for Manual Stabiliser25252
20015-Step Digital Power Supply68753
201Auto Shut-off For Cassette Players And Amplifiers31882
202House Security System146615
203Generation Of 1-Sec. Pulses Spaced 5-Sec. Apart25775
2049-Line Telephone Sharer67693
205Musical ‘Touch’ Bell57149
206Automatic Heat Detector59772
207Single Phase Electronic Starter33950
208Precision Amplifier With Digital Control42041
209Precision Attenuator With Digital Control27543
210Infrared Electronic Shooting Game19288
211Telephone Ringer Using Timer ICs35498
212Blown Fuse Indicator35225
213Automatic Speed-Controller For Fans and Coolers55975
2142-Line Intercom-Cum-Telephone Line Changeover Circuit37567
215Low-Cost PCO Billing Meter41252
216Telephone Line Based Audio Muting And Light-On Circuit26363
217Power-Supply Failure Alarm49887
218Add-On Stereo Channel Selector27002
219Parallel Telephones With Secrecy34631
220Telephone Number Display70304
221Luggage Security System46546
222Precision Digital AC Power Controller35945
223Phone BroadCaster34939
224Telephone Call Meter Using Calculator And COB34157
225Telephone Conversation Recorder44833
226Universal High-Resistance Voltmeter26096
227Protection For Your Electrical Appliances35673
228Simple Code Lock61670
229Time Switch40124
230Digital Speedometer48710
231Long-Range FM Transmitter226010
232Self-Switching Power Supply34315
233Electrical Equipment Control Using PC84850
234Teleremote Control54246
235Low-Cost Transistorised Intercom38924
236Charge Monitor For 12V Rechargeable Lead-Acid Battery69469
237Cordless Phone Backup32048
238Sleep-Switch Cum Wake-up Timer29234
239Simple Analogue To Digital Converter38547
240Dual-Channel Digital Volume Control36641
241Infrared Cordless Headphone75982
242Magnetic Proximity Switch30772
243Simple Low-Cost Digital Code Lock45880
244Ultra Low Drop Linear Regulator16440
245Simple Sensitive Remote Control Tester19382
246Electronic Scoring Game25963
247Tiny Dew Sensor25985
248Electronic Jam58173
249Precision 1Hz Clock Generator Using Chip-On-Board21182
250Digital Switching System36212
25140-Metre Direct Conversion Receiver32099
252Frequency Measurements Using PC34431
253Contactless AC Mains Voltage Detector22002
254PC-Based 7-Segment Rolling Display33198
255Electronic Card-Lock System63379
256Miniature Strobe Light28774
257Automatic Dual-Output Display20403
258CD-ROM Drive As Digital-Audio CD-Player53818
259Clap Remote34215
260Wiper Speed Controller26459
261Water Level Indicator With Alarm53120
262IC Controlled Emergency Light With Charger52872
263Auto Reset Over/Under Voltage Cut-Out7630
264Smart Phone Light21827
265Automatic Emergency Light39262
266Telecom Headset20819
267Automatic Room Power Control30720
268Handy Zener Diode Tester16566
269Telephone Line Vigilant15403
270High and Low Voltage Cutout With Delay and Melody13361
271Colour Sensor41312
272Running Message Display34905
273Low Current, High Voltage Power Supply18373
274Audio-Visual Extra Ringer For Phone10581
275Solidstate Auto Power-Off/On Mains Failure6055
2767MHz CW/AM QRP Transmitter8000
277Intelligent Switch34846
278Fluid Level Detector22865
279Programmable Door-Bell With Flashing LEDs16718
280Clap Switch32453
281Computerised Morse Code Generator/Transmitter6543
282Accurate Electronic Stop-Watch14606
283Magic Lights39828
284Digital Dice With Numeric Display19074
285Sensitive Temperature Switch19462
286Automatic Temperature Controlled Fan30446
287Watch-Dog for Telephones18937
288FM Transmitter For Channel Changer29952
289UPS For Cordless Telephones32026
290Touch-Sensitive Musical Bell With Timer15172
291Programmable LED Indicator21919
292Economical Pump Controller19684
293Fire Alarm38460
294Short Wave AM Transmitter20205
295Automatic Emergency Torch22993
296Ramp Controlled Light14037
297Simple Intercom Circuit27009
298Tank Overflow Preventer26913
29933-Volt Tunning Voltage15878
300Appliance Timer17529
 
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