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Latest Issues
September 2011
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C
I R C U I T L A B
1
)
Home Appliance Control Using TV Remote
(New)
2
)
CCFL Tester for LCD Screens
(New)
Click to view in order of 'latest circuits first'
S No.
Circuit Name
Hits
1
Infrared Toy Car Motor Controller
255007
2
Electronic Security System
203628
3
Remote Control For Home Appliances
153775
4
IR Remote Switch
141976
5
FM Booster
132694
6
Ultra-Bright LED Lamp
121406
7
Mobile Cellphone Charger
119990
8
Wireless Switch
111322
9
Mobile Phone Battery Charger
104785
10
Invisible Broken Wire Detector
103938
11
Solar Lighting System
102295
12
Quality FM Transmitter
101455
13
Remote-Controlled Fan Regulator
98872
14
Laser Torch-Based Voice Transmitter And Receiver
98030
15
Automated Traffic Signal Controller
95833
16
Ding-Dong Bell
91359
17
Infrared Cordless Headphone
90693
18
Hit Switch
90544
19
Laptop Protector
88354
20
Telephone Number Display
87838
21
Mobile Bug
85767
22
Condenser Mic Audio Amplifier
82375
23
Knock Alarm
82286
24
Charge Monitor For 12V Rechargeable Lead-Acid Battery
81978
25
15-Step Digital Power Supply
81584
26
Electronic Watchdog
81280
27
Automatic Night Lamp With Morning Alarm
80170
28
Mini UPS System
78669
29
DTMF Proximity Detector
78558
30
Anti-Theft Alarm For Bikes
77926
31
9-Line Telephone Sharer
77792
32
Touch Dimmer
77752
33
Lead-Acid Battery Charger With Voltage Analyser
77120
34
Electronic Jam
75810
35
PC-Based DC Motor Speed Controller
75403
36
Automatic Heat Detector
74663
37
IR Music Transmitter and Receiver
74520
38
Auto Turn-Off Battery Charger
74217
39
Remote-Controlled Power-Off Switch
72968
40
Electronic Motor Starter
70974
41
Fully Automatic Emergency Light
70544
42
DTMF Receiver IC MT8870 Tester
69641
43
IR Burglar Deterrent
68834
44
Secret Bell
68037
45
Programmable Timer for Appliances
66957
46
Infrared Remote Control Timer
66016
47
Three-Colour Display Using Bicolour LEDs
65843
48
IC Controlled Emergency Light With Charger
65609
49
Simple Digital Security System
65604
50
Friendly Charger for Mobile Phones
65453
51
Child's Lamp
65104
52
Solar Bug
64605
53
Digital Stop Watch
64240
54
Audio Amplifier for Personal Stereo
63005
55
Pulse Generator
62839
56
Shadow Alarm
62829
57
Water-Level Controller
62644
58
Washing Machine Motor Controller
62472
59
Flying Saucer
61842
60
Intruder Radio Alert System
61580
61
Flashing Beacon
61459
62
Electronic Candles
61244
63
Drinking Water alarm
61038
64
Antisleep Alarm for Students
61005
65
Variable Power Supply Using a Fixed-Voltage Regulator IC
60810
66
Luggage Security System
59797
67
Speed Control of DC Motor Using Pulse-Width Modulation
59318
68
Solar Panel based Charger and Small LED Lamp
59216
69
Anti-Theft Security For Car Audios
59174
70
Stress Meter
59164
71
DC Motor Control Using A Single Switch
58892
72
Watchman Watcher
58500
73
LED Lighting for Christmas
58408
74
Fire Alarm Using Thermistor
58138
75
Cell-Phone-Controlled Audio Video Mute Switch
57720
76
Remote-Operated Musical Bell
57606
77
Mobile Shield
57126
78
Medium-Power FM Transmitter
57115
79
Low-Cost Hearing Aid
56563
80
Simple Low-Cost Digital Code Lock
56425
81
Simple Telephone Ring Tone Generator
56373
82
Brake Failure Indicator
55974
83
Musical Light Chaser
55658
84
Teleconferencing System
55325
85
Versatile Water-Level Controller
55286
86
Micromotor Controller
55139
87
Colour Sensor
55095
88
Battery-level Indicator
55014
89
Laser-guided Door Opener
54783
90
Time Switch
54267
91
Clock Timer
54065
92
Automatic School Bell
53912
93
Current Sensor
53504
94
Infrared Bug
51505
95
Front Door Guard
51415
96
Automatic Low-Power Emergency Light
51167
97
Computerised Universal Timer
51161
98
Number Guessing Game
50903
99
Electronic Bicycle Lock
50609
100
Midnight Security Light
50515
101
Little Door Guard
50269
102
Ultrasonic Proximity Detector
50236
103
Smart Foot Switch
50189
104
Spy Ear
50165
105
Electronic Horn
49904
106
IR Remote Control
49631
107
Atmel AVR ISP Dongle
49543
108
Traffic Controller
49512
109
Motion Sensor for Security Light
49083
110
Electronic Code Lock
49074
111
Smart Cellphone Holder
48904
112
Mosfet-Based Preamplifier for FM Radio DXing
48779
113
Solidstate Remote Control Switch
48168
114
Motorbike Alarm
48073
115
Digital Thermometer
48065
116
Stereo Tape Head Preamplifier For PC Sound Card
47691
117
Versatile Zener Diode Tester
47609
118
Skin Response Meter
47264
119
USB Power Booster
46794
120
Mains Manager
46651
121
Car Anti-theft Guard
46242
122
Night Alert
45884
123
Fuel Reserve Indicator For Vehicles
45672
124
Flashing-Cum-Running Light
45636
125
Digital Dice
45553
126
Music On-Hold For Telephones
45247
127
Liquid Level Alarm
44946
128
Picnic Lamp
44856
129
Over-Under-Voltage Protection of Electrical Appliances
44686
130
Dual-Channel Digital Volume Control
44595
131
Telephone-Operated Calling System
44395
132
USB Power Socket
44298
133
Remote-operated Master Switch
44142
134
Seismic Sensor
44126
135
Stabilised Power Supply With Short-Circuit Indication
43591
136
Single Phase Electronic Starter
43514
137
Speller Effect Sign Display
43027
138
Highway Alert Signal Lamp
42774
139
Telephone Call Recorder
42755
140
Water-Level Indicator Using 7-segment display
42450
141
Heat-Sensitive Switch
42431
142
Automatic Phase Changer
42180
143
Light Fence
41686
144
Hearing Aid
41564
145
Car Anti-Theft Wireless Alarm
41263
146
Anti-Bag-Snatching Alarm
41150
147
Desktop Power Supply
40659
148
Versatile Power Supply
40463
149
Smart Vibration Sensor
40304
150
Sensitive Vibration Detector
40211
151
Automatic Light Controller Using 7806
40193
152
Multiband CW Transmitter
40176
153
Infrared Firecracker Igniter
40151
154
FM Transmitter For Channel Changer
40050
155
Mains Operated Christmas Star
40009
156
Mains Supply Failure Alarm
39973
157
Low-Cost Electronic Quiz Table
39516
158
Safety Guard
39456
159
Solidstate Switch For DC-Operated Gadgets
38690
160
Low Cost Transistorised Inverter
38684
161
Anti-Collision Rear Light
38361
162
Tank Overflow Preventer
38350
163
Dice With 7-Segment Display
38293
164
Multi-Switch Doorbell With Indicators
38226
165
MAT Switch
38110
166
Digital Volume Control
37223
167
Inverter for Soldering Iron
36706
168
Auto Shut-off For Cassette Players And Amplifiers
36658
169
Non-Contact Power Monitor
36514
170
Triple Power Supply
36387
171
Automated Alarm Circuits
36332
172
5-Band Graphic Equaliser
36317
173
Crystal-Controlled Time-Base Generator
36029
174
Automatic-Off Timer For CD Players
35684
175
Generator Room Light
35369
176
Low-Power Voltage Doubler
35100
177
Tester For Remote Control
34959
178
Bicycle Indicator
34927
179
Mobile Electronic Workbench
34909
180
Magic Light
34701
181
Parrot-Sounding AC Doorbell
34380
182
Constant-Current Battery Charger
34214
183
Automatic Temperature Controller
34121
184
Traffic Baton
33743
185
Wiper Speed Controller
33671
186
Voltage-Based Controller For Switches
33602
187
Numeric Water-level Indicator
33342
188
Automatic Telephone Answering Machine
32911
189
Universal High-Resistance Voltmeter
32845
190
Darkness Controlled Light Switch
32787
191
DuoPhone
32353
192
Muscular Stimulator
32168
193
Aquarium Probe
31812
194
Add-On Stereo Channel Selector
31772
195
Simple Short-Wave Transmitter
31506
196
School-College Quiz Buzzer
31428
197
Appliance Timer-Cum-Clap Switch
31225
198
Visual AC Mains Voltage Indicator
31177
199
Generation Of 1-Sec. Pulses Spaced 5-Sec. Apart
30652
200
Bell-Cum Light Controller
30644
201
Under-Over-Voltage Beep for Manual Stabiliser
30226
202
Four-Stage FM Transmitter
30077
203
Three-Phase Appliance Protector
29654
204
PC Power Manager
28793
205
Poor Man’s Hearing Aid
28647
206
Infrared Electronic Shooting Game
27629
207
Smart Hearing Aid
27497
208
Portable Lamp Flasher
26753
209
Multitone Siren
26617
210
Short-Circuit Protection in DC Low-Voltage Systems
25805
211
Car-Reversing Horn With Flasher
25472
212
Shutter Guard
25465
213
Running Lights Effect
25342
214
Multi-Melody Generator With Instrumental Effect
25320
215
Weekly Reminder
24387
216
Ready -To-Use Object Counter
24177
217
Flashing Brakelight
23894
218
Pyroelectric Fire Alarm
23809
219
Battery Opeated High Voltage Source
23695
220
Mobile Car Stereo Player
23344
221
Appliance Timer
22865
222
House Security System
22749
223
Glow Plug Controller
22696
224
Divide-By-N Counter Realisation Using ICs CD4033 And CD4017
22692
225
Telephone Call Counter
22591
226
Handy Telephone Receiver
22579
227
Capacitance Bridge
22578
228
Four-In-One Burglar Alarm
22545
229
Flasher For Deepawali
22495
230
Gas Leakage Alarm
22458
231
Low Cost Automatic Gate LIght With A Musical Bell
22251
232
Water Level Controller Using 3-Phase Starter
20772
233
Ultrasonic Switch
20457
234
33-Volt Tunning Voltage
20428
235
Telephone Amplifier
20248
236
Dancing Lights
20156
237
Automatic Switch For Audio Power Amplifier
19360
238
LED-Based Message Display
19217
239
Electric Window Fence Charger
18838
240
Fire Alarm
18482
241
Digital Timer Enhancement
17709
242
Digital Speedometer
17634
243
Programmable Priority Time Switch
17558
244
Bipolar Transistor Tester
17150
245
Clap Switch
16926
246
Water level indicator With Alarm
16880
247
A Highly Efficient DC Lamp Dimmer
16859
248
Color Sensor
16710
249
Cash Box Guard
16667
250
Simple Logic Probe
16652
251
Water-LeveL Controller
16400
252
Infrared Illuminator
15666
253
Hourly Chime Function Generator
15619
254
Automatic Emergency Light
15555
255
Soft Musical Telephone Ringer
15401
256
Smart Laptop Docking Station
15258
257
Electronic Dice Using AT89C2051
14984
258
Call Bell with Welcome Indication
14882
259
PC Multimedia Speakers
14857
260
Simple Code Lock
14718
261
Clap Remote
14681
262
Automatic Speed Controller For Fans and Coolers
14541
263
Automatic Room Power Control
14456
264
Versatile Probe
14310
265
Extension Phone Switcher
14134
266
Electronic Card-Lock System
14081
267
Simple Sensitive Remote Control Tester
14051
268
Adjustable Dancing Lights
13987
269
Intelligent Switch
13874
270
Long-range FM Transmitter
13727
271
Transistorised Logic Probe for TTL
13637
272
Musical 'Touch' Bell
13602
273
Automatic Temperature Controlled Fan
13590
274
Running Message Display
13364
275
Programmable Musical Bell
13307
276
Automatic Sprinkler Control System
13218
277
Automatic Emergency Tourch
12585
278
Low Cost Electronic Clock
12493
279
Programmable 8-Digit Code Lock
12477
280
Electronic Metronome
12283
281
Long Range IR Transmitter
12137
282
Wireless Extender for IR Remote Controls
11647
283
Fastest-finger-first-indicator
11569
284
AF/RF Signal Tracer
11092
285
Simple Intercom Circuit
10776
286
PC Based Digital Clock
10752
287
Programmable LED Indicator
10652
288
CD-Rom Drive as Digital-Audio CD Player
10509
289
Electrical Equipment control using PC
10429
290
Telephone Receiver
10427
291
Power Supply failure alarm
10316
292
Song Number Display
10288
293
Protection for your electrical Appliance
10174
294
Teleremote Control
10001
295
Darkroom Timer
9883
296
Staircase Light With Auto Switch-Off
9773
297
Powerful AM Radio Transmitter
9681
298
Electric Guitar Preamplifier
9376
299
PC-based 7 segment rolling display
9364
300
Security System Switcher
9352
301
Telephone Conversation Recorder
9216
302
Laser-based Intruder Alarm
9210
303
Transistorised Code Lock With Torch
8895
304
High & Low Voltage cutout
8780
305
Short Wave AM Transmitter
8776
306
40-Meter Direct conversion receiver
8709
307
Self Switch power supply
8672
308
Dew-Point Sensor
8671
309
Off-Line Telephone Tester
8666
310
Contactless AC Mains Voltage Detector
8619
311
Sound Controlled Flip-Flop
8511
312
Digital switching system
8453
313
Blown Fuse Indicator
8411
314
Fuild Level Detector
8345
315
Add Auto Start To Generators
8319
316
Guitar Effect Pedal Power
8258
317
Frequency measurement using PC
8001
318
AC Mains Bistable Switch
7995
319
Programmable Door-Bell with Flashing LEDS
7900
320
Watch Dog for Telephones
7685
321
Touch Sensitive Musical Bell With Timer
7658
322
Simple Analogue to digital converter
7652
323
A Low Distortion Audio Pre-amplifier
7544
324
Tiny Dew Sensor
7499
325
Magnetic Proximity switch
7428
326
Precision Amplifier with Digital Control
7393
327
Sleep Switch cum wake timer
7390
328
Economical Pump Controller
7345
329
Sensitive Temperature Switch
7269
330
PC Temperature Alarm
7208
331
Electronic Scoring game
7173
332
Low current high voltage power supply
7105
333
Digital Mains Voltage indicator
7097
334
Smart Phone Light
7030
335
Telecom Headset
6990
336
Low cost PCO Billing meter
6919
337
UPS for Cordless Telephones
6880
338
Tacho for Microprocessor Based Drives
6615
339
Phone BroadCaster
6605
340
Shortwave transmitter
6592
341
Telephone call meter using calculator and COB
6580
342
Low cost Transistorised intercom
6560
343
Digital Dice with numeric display
6441
344
2-Line Intercom-Cum-Telephone Line Changeover Circuit
6395
345
Solidstate Relay with Under/Over Voltage Protection
6377
346
Laser Communication System
6214
347
7MHz CW AM QRP Transmitter
6118
348
Handy Zener Diode tester
6084
349
Automatic Dual Output display
5972
350
Parallel telephone with Secrecy
5924
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