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   C I R C U I T     L A B


 

1Motion Sensor for Security Light (New)
2Electric Guitar Preamplifier (New)

Click to view in order of 'highest hits first'
S No.Circuit NameHits
1High-Intensity, Energy-efficient LED Light2081
2Bipolar Transistor Tester1096
3Digital Thermometer6452
4Mobile Electronic Workbench6359
5Weekly Reminder6873
6Electronic Dice Using AT89C20514929
7Digital Timer Enhancement7193
8Water-Level Indicator Using 7-segment display12391
9Automatic Light Controller Using 780615428
10Spy Ear15605
11Antisleep Alarm for Students23779
12Four-Stage FM Transmitter12549
13Numeric Water-level Indicator17145
14Versatile Probe7125
15Electronic Candles29057
16Simple Sensitive Remote Control Tester4137
17Pyroelectric Fire Alarm13059
18Telephone Call Recorder22040
19DuoPhone18474
20Mini UPS System39106
21Car-Reversing Horn With Flasher14904
22Short-Circuit Protection in DC Low-Voltage Systems13727
23Inverter for Soldering Iron21476
24Transistorised Logic Probe for TTL8531
25Constant-Current Battery Charger21793
26Multitone Siren16264
27Generator Room Light22659
28Liquid Level Alarm28671
29PC Power Manager18930
30Skin Response Meter28853
31Solar Panel based Charger and Small LED Lamp37844
32Electronic Bicycle Lock32115
33Remote-operated Master Switch29217
34USB Power Socket28704
35Triple Power Supply25172
36Smart Hearing Aid18602
37Midnight Security Light34514
38Automated Alarm Circuits25391
39Traffic Baton23329
40Laser-guided Door Opener37861
41PC Temperature Controller29093
42Battery-level Indicator37240
43Traffic Controller33824
44Night Alert32245
45Muscular Stimulator23496
46Wireless Switch73129
47Electric Window Fence Charger11398
48Three-Phase Appliance Protector21329
49Aquarium Probe23960
50Bicycle Indicator25807
51Poor Man’s Hearing Aid18616
52Portable Lamp Flasher20705
53Car Anti-theft Guard33288
54USB Power Booster35891
55Smart Vibration Sensor29897
56Drinking Water alarm45131
57Glow Plug Controller17997
58Tester For Remote Control27561
59Automatic Low-Power Emergency Light39634
60Mobile Bug64259
61LED Lighting for Christmas43225
62Current Sensor39529
63Seismic Sensor33164
64Dice With 7-Segment Display29596
65Motorbike Alarm37022
66Laptop Protector65089
67Shutter Guard20091
68Desktop Power Supply32418
69Mobile Shield45242
70Infrared Firecracker Igniter32262
71Automatic Phase Changer33283
72Flying Saucer46986
73Anti-Collision Rear Light30715
74Light Fence33019
75MAT Switch29619
765-Band Graphic Equaliser28931
77Clock Timer43532
78Fully Automatic Emergency Light55860
79IR Music Transmitter and Receiver60776
80Electronic Horn39522
81Darkroom Timer2107
82Water level indicator With Alarm3789
83PC Multimedia Speakers4235
84Precision Amplifier with Digital Control1643
85Security System Switcher2631
86Electronic Card-Lock System3633
87Blown Fuse Indicator2008
88Simple Intercom Circuit2777
89LED-Based Message Display4371
90Telephone Receiver2607
91Water-LeveL Controller3686
92Song Number Display2416
93Fastest-finger-first-indicator2576
94Musical 'Touch' Bell3203
95Audio-Visual Extra Ringer For Phone1276
96Contactless AC Mains Voltage Detector2064
97Fire Alarm3922
98Precison 1Hz Clock Generator Using Chip-On-Board1266
99Short Wave AM Transmitter2110
100Solidstate Auto Power off on Mains Failure1425
101Automatic Emergency Tourch3105
102Automatic Emergency Light3836
103Versatile CMOS TTL Logic and Clock Probe1177
104Programmable LED Indicator2747
105Touch Sensitive Musical Bell With Timer1941
106Staircase Light With Auto Switch-Off2661
1072-Line Intercom-Cum-Telephone Line Changeover Circuit1363
108Magic Light4689
109Teleremote Control2078
110Telephone Conversation Recorder2148
111Automatic Dual Output display1180
112Long Range IR Transmitter2879
113Digital Dice with numeric display1139
114Watch Dog for Telephones1534
115UPS for Cordless Telephones1396
116Economical Pump Controller1506
117Digital Speedometer4824
118House Security System5981
119Clap Switch820
120Tiny Dew Sensor1841
121Computerised Morse Code Generator Transmitter1273
122Telecom Headset1377
123Telephone Ringer Using Timer ICs1161
124Power Supply failure alarm2022
125Protection for your electrical Appliance2100
126Simple Code Lock2926
127PC-based 7 segment rolling display1745
128Automatic Room Power Control2545
129Fuild Level Detector1606
130Accurate Electronic Stop Watch1057
131Sensitive Temperature Switch1357
132Ramp Controlled Light1103
1337MHz CW AM QRP Transmitter1478
134Auto Reset Over-Under Voltage Cut-Out1175
135Shortwave transmitter1393
136Programmable Door-Bell with Flashing LEDS1879
137Precision Attenuater with Digital Control844
138Parallel telephone with Secrecy1232
139Telephone call meter using calculator and COB1405
140Magnetic Proximity switch1469
141Electronic Scoring game1425
142A Hierarchical Priority Encoder919
143Digital Mains Voltage indicator1461
144Low cost PCO Billing meter1522
145Automatic Speed Controller For Fans and Coolers2996
146Telephone line based Audio Muting936
147Precision Digial AC Power controller1038
148Phone BroadCaster1395
149Long-range FM Transmitter2906
150Self Switch power supply1874
151Electrical Equipment control using PC2237
152Low cost Transistorised intercom1397
153Cordless Phone Backup1134
154Sleep Switch cum wake timer1545
155Simple Analogue to digital converter1558
156Digital switching system1764
157Ultra Low Drop linear regulator794
15840-Meter Direct conversion receiver1784
159Frequency measurement using PC1664
160Miniature strobe light1070
161CD-Rom Drive as Digital-Audio CD Player2352
162Clap Remote3291
163Smart Phone Light1379
164Handy Zener Diode tester1190
165Telephone Line Vigilant1205
166High & Low Voltage cutout1747
167Color Sensor3295
168Running Message Display2623
169Low current high voltage power supply1325
170Intelligent Switch2715
171Automatic Temperature Controlled Fan3690
172Ultrasonic Proximity Detector43021
173Secret Bell54919
174Variable Power Supply Using a Fixed-Voltage Regulator IC54083
175Appliance Timer-Cum-Clap Switch27423
176Telephone-Operated Calling System39428
177Front Door Guard43151
178Bell-Cum Light Controller26433
179Friendly Charger for Mobile Phones53418
180Hearing Aid35673
181Speed Control of DC Motor Using Pulse-Width Modulation49880
182Remote-Controlled Fan Regulator81716
183Low-Power Voltage Doubler29982
184Parrot-Sounding AC Doorbell28966
185Multi-Melody Generator With Instrumental Effect21930
186School-College Quiz Buzzer23733
187Visual AC Mains Voltage Indicator27178
188Simple Short-Wave Transmitter27762
189Solar Lighting System84527
190Infrared Bug44228
191Picnic Lamp38147
192Versatile Power Supply35625
193Ultrasonic Proximity Detector43623
194Shadow Alarm53321
195IR Burglar Deterrent62243
196Versatile Water-Level Controller48924
197Automatic-Off Timer For CD Players31833
198Heat-Sensitive Switch36770
199Sensitive Vibration Detector34939
200Digital Dice39595
201Remote-Controlled Power-Off Switch62983
202Little Door Guard43662
203Stress Meter48440
204Medium-Power FM Transmitter51526
205Teleconferencing System49018
206Smart Cellphone Holder42884
207Fuel Reserve Indicator For Vehicles39703
208Brake Failure Indicator46729
209Safety Guard33855
210Mains Supply Failure Alarm35017
211Remote Control For Home Appliances112043
212Micromotor Controller48265
213Solar Bug54391
214Simple Digital Security System57453
215Digital Audio - Video Input Selector1405
216Auto Turn-Off Battery Charger63766
217Atmel AVR ISP Dongle44405
218Audio Amplifier for Personal Stereo56017
219Musical Light Chaser49437
220Hit Switch82787
221Water-Level Controller53255
222Fire Alarm Using Thermistor50995
223Electronic Watchdog71887
224Automatic School Bell46169
225Anti-Theft Alarm For Bikes66453
226DC Motor Control Using A Single Switch51381
227Solidstate Remote Control Switch43807
228Flashing-Cum-Running Light40638
229Quality FM Transmitter91029
230Stabilised Power Supply With Short-Circuit Indication39347
231Digital Stop Watch56786
232Cell-Phone-Controlled Audio Video Mute Switch50273
233PC-Based DC Motor Speed Controller68105
234Under-Over-Voltage Beep for Manual Stabiliser26570
235Child's Lamp55945
236Watchman Watcher50590
237Highway Alert Signal Lamp37641
238Low-Cost Electronic Quiz Table35165
239Mobile Cellphone Charger94324
240Smart Foot Switch43385
241Programmable Timer for Appliances61198
242Anti-Bag-Snatching Alarm36142
243Multiband CW Transmitter36705
244Automatic Night Lamp With Morning Alarm71197
245Touch Dimmer68511
246Mosfet-Based Preamplifier for FM Radio DXing45430
247Non-Contact Power Monitor33117
248Remote-Operated Musical Bell52502
249Electronic Motor Starter62479
250Washing Machine Motor Controller56104
251Over-Under-Voltage Protection of Electrical Appliances39570
252Low-Cost Hearing Aid50576
253Voltage-Based Controller For Switches30338
254DTMF Receiver IC MT8870 Tester64780
255Pulse Generator55635
256Infrared Remote Control Timer60511
257Multi-Switch Doorbell With Indicators34615
258Electronic Security System169045
259Lead-Acid Battery Charger With Voltage Analyser70492
260Ultra-Bright LED Lamp100455
261Three-Colour Display Using Bicolour LEDs58633
262Computerised Universal Timer47135
263Number Guessing Game44045
264Intruder Radio Alert System56971
265Flashing Beacon55045
266Knock Alarm73686
267Automated Traffic Signal Controller87079
268Infrared Toy Car Motor Controller224938
269Mains Manager42406
270Crystal-Controlled Time-Base Generator32905
271Mains Operated Christmas Star36037
272Music On-Hold For Telephones42076
273Solidstate Switch For DC-Operated Gadgets35039
274Ding-Dong Bell81596
275IR Remote Switch118574
276FM Booster113021
277Laser Torch-Based Voice Transmitter And Receiver88221
278Mobile Phone Battery Charger88518
279Condenser Mic Audio Amplifier74600
280Speller Effect Sign Display38355
281Stereo Tape Head Preamplifier For PC Sound Card44315
282Invisible Broken Wire Detector89315
283Anti-Theft Security For Car Audios53732
284Simple Telephone Ring Tone Generator51485
285DTMF Proximity Detector71986
286Versatile Zener Diode Tester43138
28715-Step Digital Power Supply73286
288Auto Shut-off For Cassette Players And Amplifiers33599
289Generation Of 1-Sec. Pulses Spaced 5-Sec. Apart27493
2909-Line Telephone Sharer71276
291Automatic Heat Detector65017
292Single Phase Electronic Starter36959
293Infrared Electronic Shooting Game22070
294Add-On Stereo Channel Selector28621
295Telephone Number Display76138
296Luggage Security System51041
297Universal High-Resistance Voltmeter28598
298Time Switch44995
299Charge Monitor For 12V Rechargeable Lead-Acid Battery75539
300Dual-Channel Digital Volume Control39701

 
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