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   C I R C U I T     L A B

 

1)  Numeric Water-level Indicator (New)
2)  Versatile Probe (New)

Click to view in order of 'highest hits first'
S No.Circuit NameHits
1Security System Switcher3417
2Electronic Candles4744
3Pyroelectric Fire Alarm5265
4Telephone Call Recorder7012
5DuoPhone8023
6Mini UPS System12948
7Car-Reversing Horn With Flasher6872
8Short-Circuit Protection in DC Low-Voltage Systems5900
9Inverter for Soldering Iron10379
10Transistorised Logic Probe for TTL4317
11Constant-Current Battery Charger12707
12Multitone Siren8652
13Generator Room Light13729
14Liquid Level Alarm17457
15PC Power Manager11863
16Skin Response Meter16929
17Solar Panel based Charger and Small LED Lamp23230
18Electronic Bicycle Lock19623
19Remote-operated Master Switch18811
20USB Power Socket18318
21Triple Power Supply17405
22Smart Hearing Aid12479
23Midnight Security Light24382
24Automated Alarm Circuits17870
25Traffic Baton16948
26Laser-guided Door Opener26453
27Battery-level Indicator26577
28PC Temperature Controller20919
29Traffic Controller24812
30Night Alert23693
31Muscular Stimulator17716
32Wireless Switch50785
33Long-Range IR Transmitter24768
34Electric Window Fence Charger6481
35Three-Phase Appliance Protector16329
36PC Multimedia Speakers28158
37Aquarium Probe18717
38Bicycle Indicator19958
39Poor Man’s Hearing Aid13392
40Portable Lamp Flasher16402
41Staircase Light With Auto Switch-Off21700
42Car Anti-theft Guard25364
43USB Power Booster29159
44Smart Vibration Sensor23512
45Drinking Water alarm35618
46GLOW PLuG CONTROLLER14669
47Versatile CMOS TTL Logic And Clock Probe10672
48Tester For Remote Control22442
49Automatic Low-Power Emergency Light32356
50Mobile Bug50399
51LED Lighting for Christmas34655
52Current Sensor31466
53Seismic Sensor26503
54Dice With 7-Segment Display23692
55Motorbike Alarm30346
56Laptop Protector50997
57Shutter Guard16522
58Desktop Power Supply27030
59Mobile Shield37447
60Infrared Firecracker Igniter26888
61Automatic Phase Changer27569
62Flying Saucer37674
63Anti-Collision Rear Light25889
64Light Fence27746
65MAT Switch24537
665-Band Graphic Equaliser24236
67Clock Timer36992
68Fully Automatic Emergency Light46695
69IR Music Transmitter and Receiver51715
70Electronic Horn33086
71Ultrasonic Proximity Detector37365
72Secret Bell46570
73Variable Power Supply Using a Fixed-Voltage Regulator IC47914
74Appliance Timer-Cum-Clap Switch24427
75Telephone-Operated Calling System35233
76Front Door Guard37400
77Bell-Cum Light Controller23333
78Friendly Charger for Mobile Phones45066
79Hearing Aid31517
80Speed Control of DC Motor Using Pulse-Width Modulation43451
81Remote-Controlled Fan Regulator70147
82Low-Power Voltage Doubler26085
83Parrot-Sounding AC Doorbell25256
84Multi-Melody Generator With Instrumental Effect19391
85School-College Quiz Buzzer18858
86Visual AC Mains Voltage Indicator24218
87Simple Short-Wave Transmitter24844
88Solar Lighting System72514
89Infrared Bug39340
90Picnic Lamp33629
91Versatile Power Supply32292
92Ultrasonic Proximity Detector39568
93Shadow Alarm47247
94IR Burglar Deterrent57425
95Versatile Water-Level Controller43739
96Automatic-Off Timer For CD Players28861
97Heat-Sensitive Switch32826
98Sensitive Vibration Detector30919
99Digital Dice35401
100Remote-Controlled Power-Off Switch56348
101Little Door Guard39139
102Stress Meter41782
103Teleconferencing System44404
104Medium-Power FM Transmitter47023
105Smart Cellphone Holder38819
106Fuel Reserve Indicator For Vehicles35695
107Brake Failure Indicator41334
108Safety Guard30241
109Mains Supply Failure Alarm31702
110Remote Control For Home Appliances92498
111Micromotor Controller43779
112Solar Bug48060
113Simple Digital Security System52236
114Digital Audio/Video Input Selector21004
115Auto Turn-Off Battery Charger56681
116Atmel AVR ISP Dongle40361
117Audio Amplifier for Personal Stereo51430
118Musical Light Chaser45008
119Water-Level Controller76731
120Hit Switch47480
121Fire Alarm Using Thermistor46467
122Electronic Watchdog64971
123Automatic School Bell41449
124Anti-Theft Alarm For Bikes59414
125DC Motor Control Using A Single Switch46742
126Solidstate Remote Control Switch40794
127Flashing-Cum-Running Light37463
128Quality FM Transmitter83809
129Stabilised Power Supply With Short-Circuit Indication36406
130Digital Stop Watch52060
131Cell-Phone-Controlled Audio/Video Mute Switch47296
132PC-Based DC Motor Speed Controller63107
133Child's Lamp50549
134Watchman Watcher45766
135Highway Alert Signal Lamp34449
136Low-Cost Electronic Quiz Table32126
137Mobile Cellphone Charger84449
138Smart Foot Switch39339
139Programmable Timer for Appliances57257
140Anti-Bag-Snatching Alarm33082
141LED-Based Message Display90479
142Multiband CW Transmitter34338
143Automatic Night Lamp With Morning Alarm65495
144Touch Dimmer62631
145Mosfet-Based Preamplifier for FM Radio DXing42845
146Non-Contact Power Monitor30913
147Remote-Operated Musical Bell49219
148Electronic Motor Starter57074
149Telephone Receiver76469
150Washing Machine Motor Controller52092
151Low-Cost Hearing Aid46974
152Over-Under-Voltage Protection of Electrical Appliances36204
153Parallel Telephone With Secrecy and Call Prevention46748
154Voltage-Based Controller For Switches28197
155DTMF Receiver IC MT8870 Tester61395
156Pulse Generator51393
157Infrared Remote Control Timer56990
158Clap Switch99720
159Multi-Switch Doorbell With Indicators32262
160Song Number Display45163
161Lead-Acid Battery Charger With Voltage Analyser65914
162Electronic Security System149008
163Three-Colour Display Using Bicolour LEDs54335
164Ultra-Bright LED Lamp90044
165Computerised Universal Timer44225
166Number Guessing Game40157
167PC-Based Oscilloscope260563
168Intruder Radio Alert System53731
169Flashing Beacon51056
170Knock Alarm68547
171Automated Traffic Signal Controller81272
172Infrared Toy Car Motor Controller208389
173Mains Manager39738
174Crystal-Controlled Time-Base Generator30838
175Mains Operated Christmas Star33859
176Music On-Hold For Telephones39935
177Solidstate Switch For DC-Operated Gadgets32632
178Ding-Dong Bell75020
179IR Remote Switch105220
180Shortwave Transmitter50507
181FM Booster102666
182Laser Torch-Based Voice Transmitter And Receiver81657
183Mobile Phone Battery Charger79003
184Fastest Finger First Indicator56949
185Condenser Mic Audio Amplifier69372
186DarkRoom Timer44158
187Speller Effect Sign Display35672
188Stereo Tape Head Preamplifier For PC Sound Card41812
189A Hierarchical Priority Encoder27285
190Digital Mains Voltage Indicator49860
191Water-Level Controller93724
192Invisible Broken Wire Detector81252
193Anti-Theft Security For Car Audios49943
194Simple Telephone Ring Tone Generator48368
195Versatile Zener Diode Tester40374
196DTMF Proximity Detector67879
197Under-/Over-Voltage Beep for Manual Stabiliser25224
19815-Step Digital Power Supply67836
199Auto Shut-off For Cassette Players And Amplifiers31501
200House Security System142718
201Generation Of 1-Sec. Pulses Spaced 5-Sec. Apart25373
2029-Line Telephone Sharer67010
203Musical ‘Touch’ Bell56405
204Automatic Heat Detector58677
205Single Phase Electronic Starter33407
206Precision Amplifier With Digital Control41571
207Precision Attenuator With Digital Control27210
208Infrared Electronic Shooting Game18704
209Telephone Ringer Using Timer ICs35002
210Blown Fuse Indicator34580
211Automatic Speed-Controller For Fans and Coolers54815
2122-Line Intercom-Cum-Telephone Line Changeover Circuit37097
213Low-Cost PCO Billing Meter40656
214Telephone Line Based Audio Muting And Light-On Circuit25994
215Power-Supply Failure Alarm49038
216Add-On Stereo Channel Selector26661
217Parallel Telephones With Secrecy34219
218Telephone Number Display69228
219Luggage Security System45737
220Precision Digital AC Power Controller35504
221Phone BroadCaster34399
222Telephone Call Meter Using Calculator And COB33628
223Telephone Conversation Recorder44135
224Universal High-Resistance Voltmeter25687
225Protection For Your Electrical Appliances34929
226Simple Code Lock60325
227Time Switch39269
228Digital Speedometer47044
229Long-Range FM Transmitter222207
230Self-Switching Power Supply33692
231Electrical Equipment Control Using PC83772
232Teleremote Control53400
233Low-Cost Transistorised Intercom38274
234Charge Monitor For 12V Rechargeable Lead-Acid Battery68016
235Cordless Phone Backup31545
236Sleep-Switch Cum Wake-up Timer28594
237Simple Analogue To Digital Converter37826
238Dual-Channel Digital Volume Control36126
239Infrared Cordless Headphone74729
240Magnetic Proximity Switch30165
241Simple Low-Cost Digital Code Lock45124
242Ultra Low Drop Linear Regulator16163
243Simple Sensitive Remote Control Tester18995
244Electronic Scoring Game25282
245Tiny Dew Sensor25362
246Electronic Jam56701
247Precision 1Hz Clock Generator Using Chip-On-Board20700
248Digital Switching System35294
24940-Metre Direct Conversion Receiver31361
250Frequency Measurements Using PC33788
251Contactless AC Mains Voltage Detector21468
252PC-Based 7-Segment Rolling Display32455
253Electronic Card-Lock System62023
254Miniature Strobe Light28203
255Automatic Dual-Output Display19927
256CD-ROM Drive As Digital-Audio CD-Player52734
257Clap Remote33102
258Wiper Speed Controller25839
259Water Level Indicator With Alarm51573
260IC Controlled Emergency Light With Charger51676
261Auto Reset Over/Under Voltage Cut-Out7628
262Smart Phone Light21180
263Automatic Emergency Light37943
264Telecom Headset20238
265Automatic Room Power Control29643
266Handy Zener Diode Tester16046
267Telephone Line Vigilant14989
268High and Low Voltage Cutout With Delay and Melody12941
269Colour Sensor39628
270Running Message Display33481
271Low Current, High Voltage Power Supply17759
272Audio-Visual Extra Ringer For Phone10217
273Solidstate Auto Power-Off/On Mains Failure6053
2747MHz CW/AM QRP Transmitter7998
275Intelligent Switch33298
276Fluid Level Detector22075
277Programmable Door-Bell With Flashing LEDs16126
278Clap Switch30786
279Computerised Morse Code Generator/Transmitter6540
280Accurate Electronic Stop-Watch14043
281Magic Lights37791
282Digital Dice With Numeric Display18309
283Sensitive Temperature Switch18679
284Automatic Temperature Controlled Fan28924
285Watch-Dog for Telephones18089
286FM Transmitter For Channel Changer28792
287UPS For Cordless Telephones30986
288Touch-Sensitive Musical Bell With Timer14341
289Programmable LED Indicator20921
290Economical Pump Controller18746
291Fire Alarm36613
292Short Wave AM Transmitter19319
293Automatic Emergency Torch21739
294Ramp Controlled Light13430
295Simple Intercom Circuit25751
296Tank Overflow Preventer25355
29733-Volt Tunning Voltage15120
298Appliance Timer16601
299Electronic Code Lock35921
300Flashing Brakelight17652
 
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