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Latest Issues

   C I R C U I T     L A B


1Home Appliance Control Using TV Remote (New)
2CCFL Tester for LCD Screens (New)

Click to view in order of 'latest circuits first'
S No.Circuit NameHits
1Infrared Toy Car Motor Controller255007
2Electronic Security System203628
3Remote Control For Home Appliances153775
4IR Remote Switch141976
5FM Booster132694
6Ultra-Bright LED Lamp121406
7Mobile Cellphone Charger119990
8Wireless Switch111322
9Mobile Phone Battery Charger104785
10Invisible Broken Wire Detector103938
11Solar Lighting System102295
12Quality FM Transmitter101455
13Remote-Controlled Fan Regulator98872
14Laser Torch-Based Voice Transmitter And Receiver98030
15Automated Traffic Signal Controller95833
16Ding-Dong Bell91359
17Infrared Cordless Headphone90693
18Hit Switch90544
19Laptop Protector88354
20Telephone Number Display87838
21Mobile Bug85767
22Condenser Mic Audio Amplifier82375
23Knock Alarm82286
24Charge Monitor For 12V Rechargeable Lead-Acid Battery81978
2515-Step Digital Power Supply81584
26Electronic Watchdog81280
27Automatic Night Lamp With Morning Alarm80170
28Mini UPS System78669
29DTMF Proximity Detector78558
30Anti-Theft Alarm For Bikes77926
319-Line Telephone Sharer77792
32Touch Dimmer77752
33Lead-Acid Battery Charger With Voltage Analyser77120
34Electronic Jam75810
35PC-Based DC Motor Speed Controller75403
36Automatic Heat Detector74663
37IR Music Transmitter and Receiver74520
38Auto Turn-Off Battery Charger74217
39Remote-Controlled Power-Off Switch72968
40Electronic Motor Starter70974
41Fully Automatic Emergency Light70544
42DTMF Receiver IC MT8870 Tester69641
43IR Burglar Deterrent68834
44Secret Bell68037
45Programmable Timer for Appliances66957
46Infrared Remote Control Timer66016
47Three-Colour Display Using Bicolour LEDs65843
48IC Controlled Emergency Light With Charger65609
49Simple Digital Security System65604
50Friendly Charger for Mobile Phones65453
51Child's Lamp65104
52Solar Bug64605
53Digital Stop Watch64240
54Audio Amplifier for Personal Stereo63005
55Pulse Generator62839
56Shadow Alarm62829
57Water-Level Controller62644
58Washing Machine Motor Controller62472
59Flying Saucer61842
60Intruder Radio Alert System61580
61Flashing Beacon61459
62Electronic Candles61244
63Drinking Water alarm61038
64Antisleep Alarm for Students61005
65Variable Power Supply Using a Fixed-Voltage Regulator IC60810
66Luggage Security System59797
67Speed Control of DC Motor Using Pulse-Width Modulation59318
68Solar Panel based Charger and Small LED Lamp59216
69Anti-Theft Security For Car Audios59174
70Stress Meter59164
71DC Motor Control Using A Single Switch58892
72Watchman Watcher58500
73LED Lighting for Christmas58408
74Fire Alarm Using Thermistor58138
75Cell-Phone-Controlled Audio Video Mute Switch57720
76Remote-Operated Musical Bell57606
77Mobile Shield57126
78Medium-Power FM Transmitter57115
79Low-Cost Hearing Aid56563
80Simple Low-Cost Digital Code Lock56425
81Simple Telephone Ring Tone Generator56373
82Brake Failure Indicator55974
83Musical Light Chaser55658
84Teleconferencing System55325
85Versatile Water-Level Controller55286
86Micromotor Controller55139
87Colour Sensor55095
88Battery-level Indicator55014
89Laser-guided Door Opener54783
90Time Switch54267
91Clock Timer54065
92Automatic School Bell53912
93Current Sensor53504
94Infrared Bug51505
95Front Door Guard51415
96Automatic Low-Power Emergency Light51167
97Computerised Universal Timer51161
98Number Guessing Game50903
99Electronic Bicycle Lock50609
100Midnight Security Light50515
101Little Door Guard50269
102Ultrasonic Proximity Detector50236
103Smart Foot Switch50189
104Spy Ear50165
105Electronic Horn49904
106IR Remote Control49631
107Atmel AVR ISP Dongle49543
108Traffic Controller49512
109Motion Sensor for Security Light49083
110Electronic Code Lock49074
111Smart Cellphone Holder48904
112Mosfet-Based Preamplifier for FM Radio DXing48779
113Solidstate Remote Control Switch48168
114Motorbike Alarm48073
115Digital Thermometer48065
116Stereo Tape Head Preamplifier For PC Sound Card47691
117Versatile Zener Diode Tester47609
118Skin Response Meter47264
119USB Power Booster46794
120Mains Manager46651
121Car Anti-theft Guard46242
122Night Alert45884
123Fuel Reserve Indicator For Vehicles45672
124Flashing-Cum-Running Light45636
125Digital Dice45553
126Music On-Hold For Telephones45247
127Liquid Level Alarm44946
128Picnic Lamp44856
129Over-Under-Voltage Protection of Electrical Appliances44686
130Dual-Channel Digital Volume Control44595
131Telephone-Operated Calling System44395
132USB Power Socket44298
133Remote-operated Master Switch44142
134Seismic Sensor44126
135Stabilised Power Supply With Short-Circuit Indication43591
136Single Phase Electronic Starter43514
137Speller Effect Sign Display43027
138Highway Alert Signal Lamp42774
139Telephone Call Recorder42755
140Water-Level Indicator Using 7-segment display42450
141Heat-Sensitive Switch42431
142Automatic Phase Changer42180
143Light Fence41686
144Hearing Aid41564
145Car Anti-Theft Wireless Alarm41263
146Anti-Bag-Snatching Alarm41150
147Desktop Power Supply40659
148Versatile Power Supply40463
149Smart Vibration Sensor40304
150Sensitive Vibration Detector40211
151Automatic Light Controller Using 780640193
152Multiband CW Transmitter40176
153Infrared Firecracker Igniter40151
154FM Transmitter For Channel Changer40050
155Mains Operated Christmas Star40009
156Mains Supply Failure Alarm39973
157Low-Cost Electronic Quiz Table39516
158Safety Guard39456
159Solidstate Switch For DC-Operated Gadgets38690
160Low Cost Transistorised Inverter38684
161Anti-Collision Rear Light38361
162Tank Overflow Preventer38350
163Dice With 7-Segment Display38293
164Multi-Switch Doorbell With Indicators38226
165MAT Switch38110
166Digital Volume Control37223
167Inverter for Soldering Iron36706
168Auto Shut-off For Cassette Players And Amplifiers36658
169Non-Contact Power Monitor36514
170Triple Power Supply36387
171Automated Alarm Circuits36332
1725-Band Graphic Equaliser36317
173Crystal-Controlled Time-Base Generator36029
174Automatic-Off Timer For CD Players35684
175Generator Room Light35369
176Low-Power Voltage Doubler35100
177Tester For Remote Control34959
178Bicycle Indicator34927
179Mobile Electronic Workbench34909
180Magic Light34701
181Parrot-Sounding AC Doorbell34380
182Constant-Current Battery Charger34214
183Automatic Temperature Controller34121
184Traffic Baton33743
185Wiper Speed Controller33671
186Voltage-Based Controller For Switches33602
187Numeric Water-level Indicator33342
188Automatic Telephone Answering Machine32911
189Universal High-Resistance Voltmeter32845
190Darkness Controlled Light Switch32787
192Muscular Stimulator32168
193Aquarium Probe31812
194Add-On Stereo Channel Selector31772
195Simple Short-Wave Transmitter31506
196School-College Quiz Buzzer31428
197Appliance Timer-Cum-Clap Switch31225
198Visual AC Mains Voltage Indicator31177
199Generation Of 1-Sec. Pulses Spaced 5-Sec. Apart30652
200Bell-Cum Light Controller30644
201Under-Over-Voltage Beep for Manual Stabiliser30226
202Four-Stage FM Transmitter30077
203Three-Phase Appliance Protector29654
204PC Power Manager28793
205Poor Man’s Hearing Aid28647
206Infrared Electronic Shooting Game27629
207Smart Hearing Aid27497
208Portable Lamp Flasher26753
209Multitone Siren26617
210Short-Circuit Protection in DC Low-Voltage Systems25805
211Car-Reversing Horn With Flasher25472
212Shutter Guard25465
213Running Lights Effect25342
214Multi-Melody Generator With Instrumental Effect25320
215Weekly Reminder24387
216Ready -To-Use Object Counter24177
217Flashing Brakelight23894
218Pyroelectric Fire Alarm23809
219Battery Opeated High Voltage Source23695
220Mobile Car Stereo Player23344
221Appliance Timer22865
222House Security System22749
223Glow Plug Controller22696
224Divide-By-N Counter Realisation Using ICs CD4033 And CD401722692
225Telephone Call Counter22591
226Handy Telephone Receiver22579
227Capacitance Bridge22578
228Four-In-One Burglar Alarm22545
229Flasher For Deepawali22495
230Gas Leakage Alarm22458
231Low Cost Automatic Gate LIght With A Musical Bell22251
232Water Level Controller Using 3-Phase Starter20772
233Ultrasonic Switch20457
23433-Volt Tunning Voltage20428
235Telephone Amplifier20248
236Dancing Lights20156
237Automatic Switch For Audio Power Amplifier19360
238LED-Based Message Display19217
239Electric Window Fence Charger18838
240Fire Alarm18482
241Digital Timer Enhancement17709
242Digital Speedometer17634
243Programmable Priority Time Switch17558
244Bipolar Transistor Tester17150
245Clap Switch16926
246Water level indicator With Alarm16880
247A Highly Efficient DC Lamp Dimmer16859
248Color Sensor16710
249Cash Box Guard16667
250Simple Logic Probe16652
251Water-LeveL Controller16400
252Infrared Illuminator15666
253Hourly Chime Function Generator15619
254Automatic Emergency Light15555
255Soft Musical Telephone Ringer15401
256Smart Laptop Docking Station15258
257Electronic Dice Using AT89C205114984
258Call Bell with Welcome Indication14882
259PC Multimedia Speakers14857
260Simple Code Lock14718
261Clap Remote14681
262Automatic Speed Controller For Fans and Coolers14541
263Automatic Room Power Control14456
264Versatile Probe14310
265Extension Phone Switcher14134
266Electronic Card-Lock System14081
267Simple Sensitive Remote Control Tester14051
268Adjustable Dancing Lights13987
269Intelligent Switch13874
270Long-range FM Transmitter13727
271Transistorised Logic Probe for TTL13637
272Musical 'Touch' Bell13602
273Automatic Temperature Controlled Fan13590
274Running Message Display13364
275Programmable Musical Bell13307
276Automatic Sprinkler Control System13218
277Automatic Emergency Tourch12585
278Low Cost Electronic Clock12493
279Programmable 8-Digit Code Lock12477
280Electronic Metronome12283
281Long Range IR Transmitter12137
282Wireless Extender for IR Remote Controls11647
284AF/RF Signal Tracer11092
285Simple Intercom Circuit10776
286PC Based Digital Clock10752
287Programmable LED Indicator10652
288CD-Rom Drive as Digital-Audio CD Player10509
289Electrical Equipment control using PC10429
290Telephone Receiver10427
291Power Supply failure alarm10316
292Song Number Display10288
293Protection for your electrical Appliance10174
294Teleremote Control10001
295Darkroom Timer9883
296Staircase Light With Auto Switch-Off9773
297Powerful AM Radio Transmitter9681
298Electric Guitar Preamplifier9376
299PC-based 7 segment rolling display9364
300Security System Switcher9352
301Telephone Conversation Recorder9216
302Laser-based Intruder Alarm9210
303Transistorised Code Lock With Torch8895
304High & Low Voltage cutout8780
305Short Wave AM Transmitter8776
30640-Meter Direct conversion receiver8709
307Self Switch power supply8672
308Dew-Point Sensor8671
309Off-Line Telephone Tester8666
310Contactless AC Mains Voltage Detector8619
311Sound Controlled Flip-Flop8511
312Digital switching system8453
313Blown Fuse Indicator8411
314Fuild Level Detector8345
315Add Auto Start To Generators8319
316Guitar Effect Pedal Power8258
317Frequency measurement using PC8001
318AC Mains Bistable Switch7995
319Programmable Door-Bell with Flashing LEDS7900
320Watch Dog for Telephones7685
321Touch Sensitive Musical Bell With Timer7658
322Simple Analogue to digital converter7652
323A Low Distortion Audio Pre-amplifier7544
324Tiny Dew Sensor7499
325Magnetic Proximity switch7428
326Precision Amplifier with Digital Control7393
327Sleep Switch cum wake timer7390
328Economical Pump Controller7345
329Sensitive Temperature Switch7269
330PC Temperature Alarm7208
331Electronic Scoring game7173
332Low current high voltage power supply7105
333Digital Mains Voltage indicator7097
334Smart Phone Light7030
335Telecom Headset6990
336Low cost PCO Billing meter6919
337UPS for Cordless Telephones6880
338Tacho for Microprocessor Based Drives6615
339Phone BroadCaster6605
340Shortwave transmitter6592
341Telephone call meter using calculator and COB6580
342Low cost Transistorised intercom6560
343Digital Dice with numeric display6441
3442-Line Intercom-Cum-Telephone Line Changeover Circuit6395
345Solidstate Relay with Under/Over Voltage Protection6377
346Laser Communication System6214
3477MHz CW AM QRP Transmitter6118
348Handy Zener Diode tester6084
349Automatic Dual Output display5972
350Parallel telephone with Secrecy5924

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