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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 Indicator4910
2Versatile Probe2008
3Security System Switcher7383
4Electronic Candles10128
5Pyroelectric Fire Alarm7102
6Telephone Call Recorder10323
7DuoPhone10370
8Mini UPS System18239
9Car-Reversing Horn With Flasher8461
10Short-Circuit Protection in DC Low-Voltage Systems7600
11Inverter for Soldering Iron12634
12Transistorised Logic Probe for TTL5209
13Constant-Current Battery Charger14519
14Multitone Siren10255
15Generator Room Light15615
16Liquid Level Alarm20021
17PC Power Manager13304
18Skin Response Meter19520
19Solar Panel based Charger and Small LED Lamp26280
20Electronic Bicycle Lock22276
21Remote-operated Master Switch20890
22USB Power Socket20422
23Triple Power Supply19062
24Smart Hearing Aid13843
25Midnight Security Light26430
26Automated Alarm Circuits19529
27Traffic Baton18310
28Laser-guided Door Opener28828
29Battery-level Indicator28810
30PC Temperature Controller22628
31Traffic Controller26780
32Night Alert25547
33Muscular Stimulator18911
34Wireless Switch55352
35Long-Range IR Transmitter26580
36Electric Window Fence Charger7379
37Three-Phase Appliance Protector17308
38PC Multimedia Speakers29852
39Aquarium Probe19750
40Bicycle Indicator21108
41Poor Man’s Hearing Aid14432
42Portable Lamp Flasher17311
43Staircase Light With Auto Switch-Off22914
44Car Anti-theft Guard27002
45USB Power Booster30525
46Smart Vibration Sensor24928
47Drinking Water alarm37513
48GLOW PLuG CONTROLLER15422
49Versatile CMOS TTL Logic And Clock Probe11213
50Tester For Remote Control23477
51Automatic Low-Power Emergency Light33789
52Mobile Bug53331
53LED Lighting for Christmas36423
54Current Sensor33170
55Seismic Sensor27889
56Dice With 7-Segment Display24936
57Motorbike Alarm31742
58Laptop Protector53853
59Shutter Guard17200
60Desktop Power Supply28066
61Mobile Shield39092
62Infrared Firecracker Igniter27891
63Automatic Phase Changer28729
64Flying Saucer39508
65Anti-Collision Rear Light26809
66Light Fence28749
67MAT Switch25450
685-Band Graphic Equaliser25186
69Clock Timer38338
70Fully Automatic Emergency Light48528
71IR Music Transmitter and Receiver53681
72Electronic Horn34386
73Ultrasonic Proximity Detector38756
74Secret Bell48386
75Variable Power Supply Using a Fixed-Voltage Regulator IC49557
76Appliance Timer-Cum-Clap Switch25110
77Telephone-Operated Calling System36302
78Front Door Guard38704
79Bell-Cum Light Controller23965
80Friendly Charger for Mobile Phones47016
81Hearing Aid32474
82Speed Control of DC Motor Using Pulse-Width Modulation44929
83Remote-Controlled Fan Regulator72900
84Low-Power Voltage Doubler26867
85Parrot-Sounding AC Doorbell26057
86Multi-Melody Generator With Instrumental Effect19960
87School-College Quiz Buzzer19907
88Visual AC Mains Voltage Indicator24874
89Simple Short-Wave Transmitter25498
90Solar Lighting System75021
91Infrared Bug40408
92Picnic Lamp34590
93Versatile Power Supply33002
94Ultrasonic Proximity Detector40556
95Shadow Alarm48659
96IR Burglar Deterrent58575
97Versatile Water-Level Controller45160
98Automatic-Off Timer For CD Players29590
99Heat-Sensitive Switch33654
100Sensitive Vibration Detector31738
101Digital Dice36370
102Remote-Controlled Power-Off Switch57844
103Little Door Guard40088
104Stress Meter43181
105Teleconferencing System45449
106Medium-Power FM Transmitter48108
107Smart Cellphone Holder39661
108Fuel Reserve Indicator For Vehicles36537
109Brake Failure Indicator42487
110Safety Guard30987
111Mains Supply Failure Alarm32438
112Remote Control For Home Appliances95341
113Micromotor Controller44781
114Solar Bug49374
115Simple Digital Security System53380
116Digital Audio/Video Input Selector21006
117Auto Turn-Off Battery Charger58111
118Atmel AVR ISP Dongle41324
119Audio Amplifier for Personal Stereo52416
120Musical Light Chaser46066
121Water-Level Controller78481
122Hit Switch48484
123Fire Alarm Using Thermistor47492
124Electronic Watchdog66602
125Automatic School Bell42452
126Anti-Theft Alarm For Bikes60907
127DC Motor Control Using A Single Switch47752
128Solidstate Remote Control Switch41470
129Flashing-Cum-Running Light38090
130Quality FM Transmitter85362
131Stabilised Power Supply With Short-Circuit Indication37040
132Digital Stop Watch53070
133Cell-Phone-Controlled Audio/Video Mute Switch47460
134PC-Based DC Motor Speed Controller64154
135Child's Lamp51562
136Watchman Watcher46811
137Highway Alert Signal Lamp35140
138Low-Cost Electronic Quiz Table32866
139Mobile Cellphone Charger86646
140Smart Foot Switch40065
141Programmable Timer for Appliances58065
142Anti-Bag-Snatching Alarm33703
143LED-Based Message Display92408
144Multiband CW Transmitter34840
145Automatic Night Lamp With Morning Alarm66747
146Touch Dimmer63840
147Mosfet-Based Preamplifier for FM Radio DXing43420
148Non-Contact Power Monitor31344
149Remote-Operated Musical Bell49887
150Electronic Motor Starter58079
151Telephone Receiver77458
152Washing Machine Motor Controller52874
153Low-Cost Hearing Aid47698
154Over-Under-Voltage Protection of Electrical Appliances36821
155Parallel Telephone With Secrecy and Call Prevention47297
156Voltage-Based Controller For Switches28597
157DTMF Receiver IC MT8870 Tester62064
158Pulse Generator52276
159Infrared Remote Control Timer57724
160Clap Switch101693
161Multi-Switch Doorbell With Indicators32705
162Song Number Display45944
163Lead-Acid Battery Charger With Voltage Analyser66826
164Electronic Security System152739
165Three-Colour Display Using Bicolour LEDs55163
166Ultra-Bright LED Lamp92352
167Computerised Universal Timer44816
168Number Guessing Game40887
169PC-Based Oscilloscope265398
170Intruder Radio Alert System54344
171Flashing Beacon51767
172Knock Alarm69544
173Automated Traffic Signal Controller82538
174Infrared Toy Car Motor Controller211349
175Mains Manager40215
176Crystal-Controlled Time-Base Generator31234
177Mains Operated Christmas Star34260
178Music On-Hold For Telephones40318
179Solidstate Switch For DC-Operated Gadgets33103
180Ding-Dong Bell76279
181IR Remote Switch106905
182Shortwave Transmitter51176
183FM Booster103992
184Laser Torch-Based Voice Transmitter And Receiver82873
185Mobile Phone Battery Charger80933
186Fastest Finger First Indicator58056
187Condenser Mic Audio Amplifier70375
188DarkRoom Timer44891
189Speller Effect Sign Display36159
190Stereo Tape Head Preamplifier For PC Sound Card42337
191A Hierarchical Priority Encoder27661
192Digital Mains Voltage Indicator50625
193Water-Level Controller95432
194Invisible Broken Wire Detector82725
195Anti-Theft Security For Car Audios50637
196Simple Telephone Ring Tone Generator48921
197Versatile Zener Diode Tester40849
198DTMF Proximity Detector68606
199Under-/Over-Voltage Beep for Manual Stabiliser25254
20015-Step Digital Power Supply68788
201Auto Shut-off For Cassette Players And Amplifiers31888
202House Security System146764
203Generation Of 1-Sec. Pulses Spaced 5-Sec. Apart25790
2049-Line Telephone Sharer67720
205Musical ‘Touch’ Bell57184
206Automatic Heat Detector59807
207Single Phase Electronic Starter33972
208Precision Amplifier With Digital Control42057
209Precision Attenuator With Digital Control27556
210Infrared Electronic Shooting Game19313
211Telephone Ringer Using Timer ICs35516
212Blown Fuse Indicator35246
213Automatic Speed-Controller For Fans and Coolers56018
2142-Line Intercom-Cum-Telephone Line Changeover Circuit37583
215Low-Cost PCO Billing Meter41266
216Telephone Line Based Audio Muting And Light-On Circuit26373
217Power-Supply Failure Alarm49917
218Add-On Stereo Channel Selector27016
219Parallel Telephones With Secrecy34648
220Telephone Number Display70337
221Luggage Security System46576
222Precision Digital AC Power Controller35962
223Phone BroadCaster34959
224Telephone Call Meter Using Calculator And COB34167
225Telephone Conversation Recorder44854
226Universal High-Resistance Voltmeter26112
227Protection For Your Electrical Appliances35723
228Simple Code Lock61715
229Time Switch40145
230Digital Speedometer48754
231Long-Range FM Transmitter226137
232Self-Switching Power Supply34329
233Electrical Equipment Control Using PC84893
234Teleremote Control54284
235Low-Cost Transistorised Intercom38948
236Charge Monitor For 12V Rechargeable Lead-Acid Battery69519
237Cordless Phone Backup32062
238Sleep-Switch Cum Wake-up Timer29255
239Simple Analogue To Digital Converter38570
240Dual-Channel Digital Volume Control36661
241Infrared Cordless Headphone76033
242Magnetic Proximity Switch30792
243Simple Low-Cost Digital Code Lock45912
244Ultra Low Drop Linear Regulator16451
245Simple Sensitive Remote Control Tester19394
246Electronic Scoring Game25986
247Tiny Dew Sensor26009
248Electronic Jam58213
249Precision 1Hz Clock Generator Using Chip-On-Board21197
250Digital Switching System36244
25140-Metre Direct Conversion Receiver32132
252Frequency Measurements Using PC34456
253Contactless AC Mains Voltage Detector22021
254PC-Based 7-Segment Rolling Display33231
255Electronic Card-Lock System63439
256Miniature Strobe Light28796
257Automatic Dual-Output Display20416
258CD-ROM Drive As Digital-Audio CD-Player53861
259Clap Remote34249
260Wiper Speed Controller26478
261Water Level Indicator With Alarm53167
262IC Controlled Emergency Light With Charger52917
263Auto Reset Over/Under Voltage Cut-Out7630
264Smart Phone Light21845
265Automatic Emergency Light39306
266Telecom Headset20838
267Automatic Room Power Control30749
268Handy Zener Diode Tester16580
269Telephone Line Vigilant15417
270High and Low Voltage Cutout With Delay and Melody13375
271Colour Sensor41365
272Running Message Display34950
273Low Current, High Voltage Power Supply18390
274Audio-Visual Extra Ringer For Phone10588
275Solidstate Auto Power-Off/On Mains Failure6055
2767MHz CW/AM QRP Transmitter8000
277Intelligent Switch34886
278Fluid Level Detector22892
279Programmable Door-Bell With Flashing LEDs16736
280Clap Switch32506
281Computerised Morse Code Generator/Transmitter6543
282Accurate Electronic Stop-Watch14629
283Magic Lights39895
284Digital Dice With Numeric Display19100
285Sensitive Temperature Switch19488
286Automatic Temperature Controlled Fan30485
287Watch-Dog for Telephones18963
288FM Transmitter For Channel Changer29984
289UPS For Cordless Telephones32055
290Touch-Sensitive Musical Bell With Timer15201
291Programmable LED Indicator21951
292Economical Pump Controller19718
293Fire Alarm38510
294Short Wave AM Transmitter20239
295Automatic Emergency Torch23039
296Ramp Controlled Light14058
297Simple Intercom Circuit27054
298Tank Overflow Preventer26970
29933-Volt Tunning Voltage15908
300Appliance Timer17572
 
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