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Latest Issues
March 2010
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C
I R C U I T L A B
1
)
Antisleep Alarm for Students
(New)
2
)
Four-Stage FM Transmitter
(New)
Click to view in order of 'highest hits first'
S No.
Circuit Name
Hits
1
Numeric Water-level Indicator
4858
2
Versatile Probe
1992
3
Security System Switcher
7370
4
Electronic Candles
10094
5
Pyroelectric Fire Alarm
7089
6
Telephone Call Recorder
10302
7
DuoPhone
10357
8
Mini UPS System
18211
9
Car-Reversing Horn With Flasher
8445
10
Short-Circuit Protection in DC Low-Voltage Systems
7586
11
Inverter for Soldering Iron
12611
12
Transistorised Logic Probe for TTL
5205
13
Constant-Current Battery Charger
14509
14
Multitone Siren
10243
15
Generator Room Light
15596
16
Liquid Level Alarm
20003
17
PC Power Manager
13293
18
Skin Response Meter
19493
19
Solar Panel based Charger and Small LED Lamp
26262
20
Electronic Bicycle Lock
22262
21
Remote-operated Master Switch
20878
22
USB Power Socket
20406
23
Triple Power Supply
19053
24
Smart Hearing Aid
13836
25
Midnight Security Light
26416
26
Automated Alarm Circuits
19514
27
Traffic Baton
18303
28
Laser-guided Door Opener
28817
29
Battery-level Indicator
28798
30
PC Temperature Controller
22615
31
Traffic Controller
26767
32
Night Alert
25528
33
Muscular Stimulator
18906
34
Wireless Switch
55314
35
Long-Range IR Transmitter
26559
36
Electric Window Fence Charger
7374
37
Three-Phase Appliance Protector
17303
38
PC Multimedia Speakers
29842
39
Aquarium Probe
19745
40
Bicycle Indicator
21099
41
Poor Man’s Hearing Aid
14425
42
Portable Lamp Flasher
17304
43
Staircase Light With Auto Switch-Off
22900
44
Car Anti-theft Guard
26988
45
USB Power Booster
30516
46
Smart Vibration Sensor
24914
47
Drinking Water alarm
37503
48
GLOW PLuG CONTROLLER
15417
49
Versatile CMOS TTL Logic And Clock Probe
11209
50
Tester For Remote Control
23466
51
Automatic Low-Power Emergency Light
33775
52
Mobile Bug
53305
53
LED Lighting for Christmas
36408
54
Current Sensor
33159
55
Seismic Sensor
27877
56
Dice With 7-Segment Display
24926
57
Motorbike Alarm
31730
58
Laptop Protector
53835
59
Shutter Guard
17195
60
Desktop Power Supply
28054
61
Mobile Shield
39081
62
Infrared Firecracker Igniter
27877
63
Automatic Phase Changer
28721
64
Flying Saucer
39493
65
Anti-Collision Rear Light
26804
66
Light Fence
28734
67
MAT Switch
25444
68
5-Band Graphic Equaliser
25179
69
Clock Timer
38318
70
Fully Automatic Emergency Light
48510
71
IR Music Transmitter and Receiver
53657
72
Electronic Horn
34372
73
Ultrasonic Proximity Detector
38743
74
Secret Bell
48373
75
Variable Power Supply Using a Fixed-Voltage Regulator IC
49532
76
Appliance Timer-Cum-Clap Switch
25104
77
Telephone-Operated Calling System
36297
78
Front Door Guard
38694
79
Bell-Cum Light Controller
23959
80
Friendly Charger for Mobile Phones
47003
81
Hearing Aid
32467
82
Speed Control of DC Motor Using Pulse-Width Modulation
44919
83
Remote-Controlled Fan Regulator
72879
84
Low-Power Voltage Doubler
26859
85
Parrot-Sounding AC Doorbell
26053
86
Multi-Melody Generator With Instrumental Effect
19955
87
School-College Quiz Buzzer
19891
88
Visual AC Mains Voltage Indicator
24867
89
Simple Short-Wave Transmitter
25491
90
Solar Lighting System
75003
91
Infrared Bug
40401
92
Picnic Lamp
34579
93
Versatile Power Supply
32994
94
Ultrasonic Proximity Detector
40549
95
Shadow Alarm
48641
96
IR Burglar Deterrent
58563
97
Versatile Water-Level Controller
45149
98
Automatic-Off Timer For CD Players
29581
99
Heat-Sensitive Switch
33648
100
Sensitive Vibration Detector
31731
101
Digital Dice
36361
102
Remote-Controlled Power-Off Switch
57831
103
Little Door Guard
40081
104
Stress Meter
43164
105
Teleconferencing System
45410
106
Medium-Power FM Transmitter
48096
107
Smart Cellphone Holder
39655
108
Fuel Reserve Indicator For Vehicles
36532
109
Brake Failure Indicator
42479
110
Safety Guard
30982
111
Mains Supply Failure Alarm
32430
112
Remote Control For Home Appliances
95317
113
Micromotor Controller
44772
114
Solar Bug
49361
115
Simple Digital Security System
53369
116
Digital Audio/Video Input Selector
21006
117
Auto Turn-Off Battery Charger
58095
118
Atmel AVR ISP Dongle
41321
119
Audio Amplifier for Personal Stereo
52402
120
Musical Light Chaser
46051
121
Water-Level Controller
78471
122
Hit Switch
48478
123
Fire Alarm Using Thermistor
47478
124
Electronic Watchdog
66586
125
Automatic School Bell
42444
126
Anti-Theft Alarm For Bikes
60891
127
DC Motor Control Using A Single Switch
47742
128
Solidstate Remote Control Switch
41464
129
Flashing-Cum-Running Light
38086
130
Quality FM Transmitter
85348
131
Stabilised Power Supply With Short-Circuit Indication
37010
132
Digital Stop Watch
53051
133
Cell-Phone-Controlled Audio/Video Mute Switch
47458
134
PC-Based DC Motor Speed Controller
64146
135
Child's Lamp
51556
136
Watchman Watcher
46798
137
Highway Alert Signal Lamp
35135
138
Low-Cost Electronic Quiz Table
32863
139
Mobile Cellphone Charger
86627
140
Smart Foot Switch
40061
141
Programmable Timer for Appliances
58051
142
Anti-Bag-Snatching Alarm
33695
143
LED-Based Message Display
92396
144
Multiband CW Transmitter
34837
145
Automatic Night Lamp With Morning Alarm
66737
146
Touch Dimmer
63827
147
Mosfet-Based Preamplifier for FM Radio DXing
43412
148
Non-Contact Power Monitor
31341
149
Remote-Operated Musical Bell
49878
150
Electronic Motor Starter
58067
151
Telephone Receiver
77444
152
Washing Machine Motor Controller
52867
153
Low-Cost Hearing Aid
47688
154
Over-Under-Voltage Protection of Electrical Appliances
36815
155
Parallel Telephone With Secrecy and Call Prevention
47289
156
Voltage-Based Controller For Switches
28592
157
DTMF Receiver IC MT8870 Tester
62058
158
Pulse Generator
52257
159
Infrared Remote Control Timer
57705
160
Clap Switch
101665
161
Multi-Switch Doorbell With Indicators
32698
162
Song Number Display
45933
163
Lead-Acid Battery Charger With Voltage Analyser
66819
164
Electronic Security System
152711
165
Three-Colour Display Using Bicolour LEDs
55155
166
Ultra-Bright LED Lamp
92332
167
Computerised Universal Timer
44807
168
Number Guessing Game
40881
169
PC-Based Oscilloscope
265362
170
Intruder Radio Alert System
54335
171
Flashing Beacon
51758
172
Knock Alarm
69528
173
Automated Traffic Signal Controller
82524
174
Infrared Toy Car Motor Controller
211319
175
Mains Manager
40208
176
Crystal-Controlled Time-Base Generator
31230
177
Mains Operated Christmas Star
34253
178
Music On-Hold For Telephones
40313
179
Solidstate Switch For DC-Operated Gadgets
33098
180
Ding-Dong Bell
76264
181
IR Remote Switch
106882
182
Shortwave Transmitter
51164
183
FM Booster
103975
184
Laser Torch-Based Voice Transmitter And Receiver
82855
185
Mobile Phone Battery Charger
80918
186
Fastest Finger First Indicator
58046
187
Condenser Mic Audio Amplifier
70362
188
DarkRoom Timer
44883
189
Speller Effect Sign Display
36153
190
Stereo Tape Head Preamplifier For PC Sound Card
42331
191
A Hierarchical Priority Encoder
27656
192
Digital Mains Voltage Indicator
50616
193
Water-Level Controller
95420
194
Invisible Broken Wire Detector
82712
195
Anti-Theft Security For Car Audios
50626
196
Simple Telephone Ring Tone Generator
48915
197
Versatile Zener Diode Tester
40837
198
DTMF Proximity Detector
68598
199
Under-/Over-Voltage Beep for Manual Stabiliser
25253
200
15-Step Digital Power Supply
68774
201
Auto Shut-off For Cassette Players And Amplifiers
31883
202
House Security System
146723
203
Generation Of 1-Sec. Pulses Spaced 5-Sec. Apart
25785
204
9-Line Telephone Sharer
67707
205
Musical ‘Touch’ Bell
57167
206
Automatic Heat Detector
59796
207
Single Phase Electronic Starter
33962
208
Precision Amplifier With Digital Control
42051
209
Precision Attenuator With Digital Control
27550
210
Infrared Electronic Shooting Game
19304
211
Telephone Ringer Using Timer ICs
35508
212
Blown Fuse Indicator
35240
213
Automatic Speed-Controller For Fans and Coolers
56006
214
2-Line Intercom-Cum-Telephone Line Changeover Circuit
37576
215
Low-Cost PCO Billing Meter
41258
216
Telephone Line Based Audio Muting And Light-On Circuit
26368
217
Power-Supply Failure Alarm
49904
218
Add-On Stereo Channel Selector
27011
219
Parallel Telephones With Secrecy
34645
220
Telephone Number Display
70327
221
Luggage Security System
46564
222
Precision Digital AC Power Controller
35951
223
Phone BroadCaster
34950
224
Telephone Call Meter Using Calculator And COB
34162
225
Telephone Conversation Recorder
44847
226
Universal High-Resistance Voltmeter
26104
227
Protection For Your Electrical Appliances
35702
228
Simple Code Lock
61704
229
Time Switch
40136
230
Digital Speedometer
48747
231
Long-Range FM Transmitter
226098
232
Self-Switching Power Supply
34326
233
Electrical Equipment Control Using PC
84879
234
Teleremote Control
54270
235
Low-Cost Transistorised Intercom
38943
236
Charge Monitor For 12V Rechargeable Lead-Acid Battery
69504
237
Cordless Phone Backup
32055
238
Sleep-Switch Cum Wake-up Timer
29246
239
Simple Analogue To Digital Converter
38564
240
Dual-Channel Digital Volume Control
36651
241
Infrared Cordless Headphone
76017
242
Magnetic Proximity Switch
30787
243
Simple Low-Cost Digital Code Lock
45901
244
Ultra Low Drop Linear Regulator
16446
245
Simple Sensitive Remote Control Tester
19389
246
Electronic Scoring Game
25977
247
Tiny Dew Sensor
26001
248
Electronic Jam
58200
249
Precision 1Hz Clock Generator Using Chip-On-Board
21190
250
Digital Switching System
36234
251
40-Metre Direct Conversion Receiver
32120
252
Frequency Measurements Using PC
34446
253
Contactless AC Mains Voltage Detector
22016
254
PC-Based 7-Segment Rolling Display
33223
255
Electronic Card-Lock System
63424
256
Miniature Strobe Light
28786
257
Automatic Dual-Output Display
20411
258
CD-ROM Drive As Digital-Audio CD-Player
53850
259
Clap Remote
34241
260
Wiper Speed Controller
26473
261
Water Level Indicator With Alarm
53158
262
IC Controlled Emergency Light With Charger
52903
263
Auto Reset Over/Under Voltage Cut-Out
7630
264
Smart Phone Light
21836
265
Automatic Emergency Light
39295
266
Telecom Headset
20831
267
Automatic Room Power Control
30743
268
Handy Zener Diode Tester
16573
269
Telephone Line Vigilant
15412
270
High and Low Voltage Cutout With Delay and Melody
13373
271
Colour Sensor
41349
272
Running Message Display
34938
273
Low Current, High Voltage Power Supply
18384
274
Audio-Visual Extra Ringer For Phone
10584
275
Solidstate Auto Power-Off/On Mains Failure
6055
276
7MHz CW/AM QRP Transmitter
8000
277
Intelligent Switch
34875
278
Fluid Level Detector
22884
279
Programmable Door-Bell With Flashing LEDs
16730
280
Clap Switch
32486
281
Computerised Morse Code Generator/Transmitter
6543
282
Accurate Electronic Stop-Watch
14616
283
Magic Lights
39871
284
Digital Dice With Numeric Display
19091
285
Sensitive Temperature Switch
19479
286
Automatic Temperature Controlled Fan
30475
287
Watch-Dog for Telephones
18952
288
FM Transmitter For Channel Changer
29975
289
UPS For Cordless Telephones
32040
290
Touch-Sensitive Musical Bell With Timer
15194
291
Programmable LED Indicator
21941
292
Economical Pump Controller
19708
293
Fire Alarm
38491
294
Short Wave AM Transmitter
20231
295
Automatic Emergency Torch
23027
296
Ramp Controlled Light
14050
297
Simple Intercom Circuit
27041
298
Tank Overflow Preventer
26956
299
33-Volt Tunning Voltage
15892
300
Appliance Timer
17559
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