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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 Switcher3302
2Electronic Candles4608
3Pyroelectric Fire Alarm5216
4Telephone Call Recorder6923
5DuoPhone7957
6Mini UPS System12783
7Car-Reversing Horn With Flasher6829
8Short-Circuit Protection in DC Low-Voltage Systems5851
9Inverter for Soldering Iron10329
10Transistorised Logic Probe for TTL4290
11Constant-Current Battery Charger12658
12Multitone Siren8601
13Generator Room Light13682
14Liquid Level Alarm17391
15PC Power Manager11820
16Skin Response Meter16843
17Solar Panel based Charger and Small LED Lamp23141
18Electronic Bicycle Lock19554
19Remote-operated Master Switch18756
20USB Power Socket18255
21Triple Power Supply17351
22Smart Hearing Aid12447
23Midnight Security Light24316
24Automated Alarm Circuits17822
25Traffic Baton16904
26Laser-guided Door Opener26381
27Battery-level Indicator26526
28PC Temperature Controller20872
29Traffic Controller24764
30Night Alert23647
31Muscular Stimulator17688
32Wireless Switch50669
33Long-Range IR Transmitter24708
34Electric Window Fence Charger6454
35Three-Phase Appliance Protector16299
36PC Multimedia Speakers28121
37Aquarium Probe18697
38Bicycle Indicator19929
39Poor Man’s Hearing Aid13370
40Portable Lamp Flasher16380
41Staircase Light With Auto Switch-Off21675
42Car Anti-theft Guard25332
43USB Power Booster29125
44Smart Vibration Sensor23486
45Drinking Water alarm35578
46GLOW PLuG CONTROLLER14645
47Versatile CMOS TTL Logic And Clock Probe10658
48Tester For Remote Control22418
49Automatic Low-Power Emergency Light32326
50Mobile Bug50337
51LED Lighting for Christmas34610
52Current Sensor31432
53Seismic Sensor26472
54Dice With 7-Segment Display23662
55Motorbike Alarm30307
56Laptop Protector50926
57Shutter Guard16498
58Desktop Power Supply27010
59Mobile Shield37396
60Infrared Firecracker Igniter26860
61Automatic Phase Changer27537
62Flying Saucer37627
63Anti-Collision Rear Light25863
64Light Fence27721
65MAT Switch24508
665-Band Graphic Equaliser24209
67Clock Timer36961
68Fully Automatic Emergency Light46651
69IR Music Transmitter and Receiver51667
70Electronic Horn33054
71Ultrasonic Proximity Detector37327
72Secret Bell46526
73Variable Power Supply Using a Fixed-Voltage Regulator IC47869
74Appliance Timer-Cum-Clap Switch24404
75Telephone-Operated Calling System35207
76Front Door Guard37369
77Bell-Cum Light Controller23316
78Friendly Charger for Mobile Phones45021
79Hearing Aid31490
80Speed Control of DC Motor Using Pulse-Width Modulation43426
81Remote-Controlled Fan Regulator70092
82Low-Power Voltage Doubler26066
83Parrot-Sounding AC Doorbell25239
84Multi-Melody Generator With Instrumental Effect19375
85School-College Quiz Buzzer18836
86Visual AC Mains Voltage Indicator24200
87Simple Short-Wave Transmitter24823
88Solar Lighting System72439
89Infrared Bug39315
90Picnic Lamp33608
91Versatile Power Supply32272
92Ultrasonic Proximity Detector39548
93Shadow Alarm47195
94IR Burglar Deterrent57395
95Versatile Water-Level Controller43707
96Automatic-Off Timer For CD Players28843
97Heat-Sensitive Switch32806
98Sensitive Vibration Detector30894
99Digital Dice35383
100Remote-Controlled Power-Off Switch56313
101Little Door Guard39125
102Stress Meter41739
103Teleconferencing System44383
104Medium-Power FM Transmitter47003
105Smart Cellphone Holder38800
106Fuel Reserve Indicator For Vehicles35675
107Brake Failure Indicator41302
108Safety Guard30222
109Mains Supply Failure Alarm31685
110Remote Control For Home Appliances92431
111Micromotor Controller43758
112Solar Bug48025
113Simple Digital Security System52220
114Digital Audio/Video Input Selector21004
115Auto Turn-Off Battery Charger56649
116Atmel AVR ISP Dongle40331
117Audio Amplifier for Personal Stereo51404
118Musical Light Chaser44984
119Water-Level Controller76684
120Hit Switch47457
121Fire Alarm Using Thermistor46445
122Electronic Watchdog64921
123Automatic School Bell41431
124Anti-Theft Alarm For Bikes59379
125DC Motor Control Using A Single Switch46723
126Solidstate Remote Control Switch40781
127Flashing-Cum-Running Light37448
128Quality FM Transmitter83774
129Stabilised Power Supply With Short-Circuit Indication36398
130Digital Stop Watch52032
131Cell-Phone-Controlled Audio/Video Mute Switch47289
132PC-Based DC Motor Speed Controller63088
133Child's Lamp50530
134Watchman Watcher45743
135Highway Alert Signal Lamp34437
136Low-Cost Electronic Quiz Table32111
137Mobile Cellphone Charger84404
138Smart Foot Switch39325
139Programmable Timer for Appliances57245
140Anti-Bag-Snatching Alarm33070
141LED-Based Message Display90430
142Multiband CW Transmitter34325
143Automatic Night Lamp With Morning Alarm65462
144Touch Dimmer62608
145Mosfet-Based Preamplifier for FM Radio DXing42835
146Non-Contact Power Monitor30901
147Remote-Operated Musical Bell49203
148Electronic Motor Starter57049
149Telephone Receiver76445
150Washing Machine Motor Controller52075
151Low-Cost Hearing Aid46957
152Over-Under-Voltage Protection of Electrical Appliances36192
153Parallel Telephone With Secrecy and Call Prevention46739
154Voltage-Based Controller For Switches28191
155DTMF Receiver IC MT8870 Tester61384
156Pulse Generator51373
157Infrared Remote Control Timer56980
158Clap Switch99677
159Multi-Switch Doorbell With Indicators32255
160Song Number Display45148
161Lead-Acid Battery Charger With Voltage Analyser65899
162Electronic Security System148920
163Three-Colour Display Using Bicolour LEDs54307
164Ultra-Bright LED Lamp89994
165Computerised Universal Timer44215
166Number Guessing Game40134
167PC-Based Oscilloscope260411
168Intruder Radio Alert System53715
169Flashing Beacon51041
170Knock Alarm68519
171Automated Traffic Signal Controller81243
172Infrared Toy Car Motor Controller208333
173Mains Manager39729
174Crystal-Controlled Time-Base Generator30830
175Mains Operated Christmas Star33846
176Music On-Hold For Telephones39931
177Solidstate Switch For DC-Operated Gadgets32628
178Ding-Dong Bell74991
179IR Remote Switch105188
180Shortwave Transmitter50496
181FM Booster102642
182Laser Torch-Based Voice Transmitter And Receiver81630
183Mobile Phone Battery Charger78956
184Fastest Finger First Indicator56926
185Condenser Mic Audio Amplifier69355
186DarkRoom Timer44137
187Speller Effect Sign Display35661
188Stereo Tape Head Preamplifier For PC Sound Card41801
189A Hierarchical Priority Encoder27282
190Digital Mains Voltage Indicator49851
191Water-Level Controller93680
192Invisible Broken Wire Detector81223
193Anti-Theft Security For Car Audios49934
194Simple Telephone Ring Tone Generator48358
195Versatile Zener Diode Tester40365
196DTMF Proximity Detector67866
197Under-/Over-Voltage Beep for Manual Stabiliser25223
19815-Step Digital Power Supply67814
199Auto Shut-off For Cassette Players And Amplifiers31494
200House Security System142612
201Generation Of 1-Sec. Pulses Spaced 5-Sec. Apart25365
2029-Line Telephone Sharer66996
203Musical ‘Touch’ Bell56392
204Automatic Heat Detector58653
205Single Phase Electronic Starter33393
206Precision Amplifier With Digital Control41559
207Precision Attenuator With Digital Control27205
208Infrared Electronic Shooting Game18691
209Telephone Ringer Using Timer ICs34993
210Blown Fuse Indicator34570
211Automatic Speed-Controller For Fans and Coolers54790
2122-Line Intercom-Cum-Telephone Line Changeover Circuit37091
213Low-Cost PCO Billing Meter40643
214Telephone Line Based Audio Muting And Light-On Circuit25991
215Power-Supply Failure Alarm49020
216Add-On Stereo Channel Selector26653
217Parallel Telephones With Secrecy34213
218Telephone Number Display69202
219Luggage Security System45720
220Precision Digital AC Power Controller35500
221Phone BroadCaster34382
222Telephone Call Meter Using Calculator And COB33619
223Telephone Conversation Recorder44115
224Universal High-Resistance Voltmeter25682
225Protection For Your Electrical Appliances34911
226Simple Code Lock60298
227Time Switch39251
228Digital Speedometer47007
229Long-Range FM Transmitter222121
230Self-Switching Power Supply33678
231Electrical Equipment Control Using PC83741
232Teleremote Control53382
233Low-Cost Transistorised Intercom38257
234Charge Monitor For 12V Rechargeable Lead-Acid Battery67984
235Cordless Phone Backup31534
236Sleep-Switch Cum Wake-up Timer28582
237Simple Analogue To Digital Converter37804
238Dual-Channel Digital Volume Control36118
239Infrared Cordless Headphone74708
240Magnetic Proximity Switch30154
241Simple Low-Cost Digital Code Lock45105
242Ultra Low Drop Linear Regulator16160
243Simple Sensitive Remote Control Tester18987
244Electronic Scoring Game25268
245Tiny Dew Sensor25355
246Electronic Jam56675
247Precision 1Hz Clock Generator Using Chip-On-Board20691
248Digital Switching System35275
24940-Metre Direct Conversion Receiver31331
250Frequency Measurements Using PC33774
251Contactless AC Mains Voltage Detector21461
252PC-Based 7-Segment Rolling Display32448
253Electronic Card-Lock System61994
254Miniature Strobe Light28194
255Automatic Dual-Output Display19921
256CD-ROM Drive As Digital-Audio CD-Player52709
257Clap Remote33078
258Wiper Speed Controller25826
259Water Level Indicator With Alarm51530
260IC Controlled Emergency Light With Charger51655
261Auto Reset Over/Under Voltage Cut-Out7628
262Smart Phone Light21167
263Automatic Emergency Light37909
264Telecom Headset20228
265Automatic Room Power Control29621
266Handy Zener Diode Tester16027
267Telephone Line Vigilant14980
268High and Low Voltage Cutout With Delay and Melody12937
269Colour Sensor39588
270Running Message Display33447
271Low Current, High Voltage Power Supply17743
272Audio-Visual Extra Ringer For Phone10209
273Solidstate Auto Power-Off/On Mains Failure6053
2747MHz CW/AM QRP Transmitter7998
275Intelligent Switch33268
276Fluid Level Detector22060
277Programmable Door-Bell With Flashing LEDs16112
278Clap Switch30751
279Computerised Morse Code Generator/Transmitter6540
280Accurate Electronic Stop-Watch14033
281Magic Lights37737
282Digital Dice With Numeric Display18298
283Sensitive Temperature Switch18661
284Automatic Temperature Controlled Fan28890
285Watch-Dog for Telephones18075
286FM Transmitter For Channel Changer28768
287UPS For Cordless Telephones30958
288Touch-Sensitive Musical Bell With Timer14324
289Programmable LED Indicator20908
290Economical Pump Controller18728
291Fire Alarm36567
292Short Wave AM Transmitter19295
293Automatic Emergency Torch21714
294Ramp Controlled Light13420
295Simple Intercom Circuit25722
296Tank Overflow Preventer25327
29733-Volt Tunning Voltage15104
298Appliance Timer16582
299Electronic Code Lock35872
300Flashing Brakelight17612
 
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