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Latest Issues
July 2008
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C
I R C U I T L A B
1
)
PC Multimedia Speakers
(New)
2
)
Three-Phase Appliance Protector
(New)
Click to view in order of 'highest hits first'
S No.
Circuit Name
Hits
1
Aquarium Probe
2297
2
Bicycle Indicator
2098
3
Poor Man’s Hearing Aid
1747
4
Portable Lamp Flasher
2720
5
Staircase Light With Auto Switch-Off
4560
6
Car Anti-theft Guard
3907
7
USB Power Booster
6695
8
Smart Vibration Sensor
5244
9
Drinking Water alarm
8510
10
GLOW PLuG CONTROLLER
4010
11
Versatile CMOS TTL Logic And Clock Probe
2843
12
Tester For Remote Control
6921
13
Automatic Low-Power Emergency Light
11966
14
Mobile Bug
13999
15
LED Lighting for Christmas
10522
16
Current Sensor
11082
17
Seismic Sensor
9514
18
Dice With 7-Segment Display
7629
19
Motorbike Alarm
12426
20
Laptop Protector
16976
21
Shutter Guard
7257
22
Desktop Power Supply
11759
23
Mobile Shield
16752
24
Infrared Firecracker Igniter
12244
25
Automatic Phase Changer
12970
26
Flying Saucer
16393
27
Anti-Collision Rear Light
13173
28
Light Fence
13831
29
MAT Switch
11639
30
5-Band Graphic Equaliser
11391
31
Clock Timer
19210
32
Fully Automatic Emergency Light
24223
33
IR Music Transmitter and Receiver
28255
34
Electronic Horn
17245
35
Ultrasonic Proximity Detector
20603
36
Secret Bell
24303
37
Variable Power Supply Using a Fixed-Voltage Regulator IC
28099
38
Appliance Timer-Cum-Clap Switch
14408
39
Telephone-Operated Calling System
20297
40
Front Door Guard
21508
41
Bell-Cum Light Controller
14091
42
Friendly Charger for Mobile Phones
23918
43
Hearing Aid
18585
44
Speed Control of DC Motor Using Pulse-Width Modulation
24617
45
Remote-Controlled Fan Regulator
40644
46
Low-Power Voltage Doubler
15479
47
Parrot-Sounding AC Doorbell
15396
48
Multi-Melody Generator With Instrumental Effect
11884
49
School/College Quiz Buzzer
13753
50
Visual AC Mains Voltage Indicator
14921
51
Simple Short-Wave Transmitter
16091
52
Solar Lighting System
41966
53
Infrared Bug
26180
54
Picnic Lamp
21699
55
Versatile Power Supply
22904
56
Ultrasonic Proximity Detector
27914
57
Shadow Alarm
30691
58
IR Burglar Deterrent
34671
59
Versatile Water-Level Controller
27813
60
Automatic-Off Timer For CD Players
19549
61
Heat-Sensitive Switch
21858
62
Sensitive Vibration Detector
21575
63
Digital Dice
23713
64
Remote-Controlled Power-Off Switch
38937
65
Little Door Guard
28008
66
Stress Meter
26598
67
Teleconferencing System
30742
68
Medium-Power FM Transmitter
33937
69
Smart Cellphone Holder
27660
70
Fuel Reserve Indicator For Vehicles
25200
71
Brake Failure Indicator
27737
72
Safety Guard
21061
73
Mains Supply Failure Alarm
22352
74
Remote Control For Home Appliances
63455
75
Micromotor Controller
31402
76
Solar Bug
33448
77
Simple Digital Security System
37622
78
Digital Audio/Video Input Selector
20637
79
Auto Turn-Off Battery Charger
39366
80
Atmel AVR ISP Dongle
28131
81
Audio Amplifier for Personal Stereo
38614
82
Musical Light Chaser
32675
83
Water-Level Controller
54821
84
Hit Switch
34581
85
Fire Alarm Using Thermistor
33405
86
Electronic Watchdog
45901
87
Automatic School Bell
29869
88
Anti-Theft Alarm For Bikes
43427
89
DC Motor Control Using A Single Switch
34665
90
Solidstate Remote Control Switch
32227
91
Flashing-Cum-Running Light
28758
92
Quality FM Transmitter
64686
93
Stabilised Power Supply With Short-Circuit Indication
28599
94
Digital Stop Watch
39482
95
Cell-Phone-Controlled Audio/Video Mute Switch
44626
96
PC-Based DC Motor Speed Controller
49645
97
Child's Lamp
37865
98
Watchman Watcher
33794
99
Highway Alert Signal Lamp
26294
100
Low-Cost Electronic Quiz Table
24199
101
Mobile Cellphone Charger
58709
102
Smart Foot Switch
30039
103
Programmable Timer for Appliances
46563
104
Anti-Bag-Snatching Alarm
25808
105
LED-Based Message Display
68863
106
Multiband CW Transmitter
28216
107
Automatic Night Lamp With Morning Alarm
51924
108
Touch Dimmer
47473
109
Mosfet-Based Preamplifier for FM Radio DXing
33993
110
Non-Contact Power Monitor
25145
111
Remote-Operated Musical Bell
41520
112
Electronic Motor Starter
45015
113
Telephone Receiver
64123
114
Washing Machine Motor Controller
41863
115
Low-Cost Hearing Aid
38317
116
Over-/Under-Voltage Protection of Electrical Appliances
33292
117
Parallel Telephone With Secrecy and Call Prevention
39097
118
Voltage-Based Controller For Switches
22838
119
DTMF Receiver IC MT8870 Tester
51584
120
Pulse Generator
40892
121
Infrared Remote Control Timer
47853
122
Clap Switch
77991
123
Multi-Switch Doorbell With Indicators
26971
124
Song Number Display
36499
125
Lead-Acid Battery Charger With Voltage Analyser
53976
126
Electronic Security System
103153
127
Three-Colour Display Using Bicolour LEDs
44622
128
Ultra-Bright LED Lamp
66316
129
Computerised Universal Timer
36929
130
Number Guessing Game
31922
131
PC-Based Oscilloscope
212161
132
Intruder Radio Alert System
45699
133
Flashing Beacon
41453
134
Knock Alarm
56533
135
Automated Traffic Signal Controller
65747
136
Infrared Toy Car Motor Controller
176198
137
Mains Manager
33157
138
Crystal-Controlled Time-Base Generator
25817
139
Mains Operated Christmas Star
28141
140
Music On-Hold For Telephones
34881
141
Solidstate Switch For DC-Operated Gadgets
26515
142
Ding-Dong Bell
60038
143
IR Remote Switch
86021
144
Shortwave Transmitter
41747
145
FM Booster
86045
146
Laser Torch-Based Voice Transmitter And Receiver
67799
147
Mobile Phone Battery Charger
58535
148
Fastest Finger First Indicator
43905
149
Condenser Mic Audio Amplifier
57331
150
DarkRoom Timer
34962
151
Speller Effect Sign Display
29329
152
Stereo Tape Head Preamplifier For PC Sound Card
35033
153
A Hierarchical Priority Encoder
22011
154
Digital Mains Voltage Indicator
39717
155
Water-Level Controller
71183
156
Invisible Broken Wire Detector
63892
157
Anti-Theft Security For Car Audios
41523
158
Simple Telephone Ring Tone Generator
40889
159
Versatile Zener Diode Tester
33141
160
DTMF Proximity Detector
58093
161
Under-/Over-Voltage Beep for Manual Stabiliser
24422
162
15-Step Digital Power Supply
56206
163
Auto Shut-off For Cassette Players And Amplifiers
26444
164
House Security System
99907
165
Generation Of 1-Sec. Pulses Spaced 5-Sec. Apart
20268
166
9-Line Telephone Sharer
57426
167
Musical ‘Touch’ Bell
49338
168
Automatic Heat Detector
46238
169
Single Phase Electronic Starter
25655
170
Precision Amplifier With Digital Control
35007
171
Precision Attenuator With Digital Control
21907
172
Infrared Electronic Shooting Game
10922
173
Telephone Ringer Using Timer ICs
28653
174
Blown Fuse Indicator
26236
175
Automatic Speed-Controller For Fans and Coolers
41835
176
2-Line Intercom-Cum-Telephone Line Changeover Circuit
30852
177
Low-Cost PCO Billing Meter
32775
178
Telephone Line Based Audio Muting And Light-On Circuit
20642
179
Power-Supply Failure Alarm
38550
180
Add-On Stereo Channel Selector
21799
181
Parallel Telephones With Secrecy
28206
182
Telephone Number Display
55917
183
Luggage Security System
35579
184
Precision Digital AC Power Controller
28865
185
Phone BroadCaster
27509
186
Telephone Call Meter Using Calculator And COB
26666
187
Telephone Conversation Recorder
34291
188
Universal High-Resistance Voltmeter
19829
189
Protection For Your Electrical Appliances
25377
190
Simple Code Lock
43751
191
Time Switch
28534
192
Digital Speedometer
26165
193
Long-Range FM Transmitter
177327
194
Self-Switching Power Supply
25763
195
Electrical Equipment Control Using PC
69853
196
Teleremote Control
42432
197
Low-Cost Transistorised Intercom
29744
198
Charge Monitor For 12V Rechargeable Lead-Acid Battery
50976
199
Cordless Phone Backup
25267
200
Sleep-Switch Cum Wake-up Timer
20741
201
Simple Analogue To Digital Converter
28856
202
Dual-Channel Digital Volume Control
28495
203
Infrared Cordless Headphone
60342
204
Magnetic Proximity Switch
22455
205
Simple Low-Cost Digital Code Lock
35167
206
Ultra Low Drop Linear Regulator
12038
207
Simple Sensitive Remote Control Tester
13716
208
Electronic Scoring Game
17207
209
Tiny Dew Sensor
17989
210
Electronic Jam
40289
211
Precision 1Hz Clock Generator Using Chip-On-Board
14002
212
Digital Switching System
24610
213
40-Metre Direct Conversion Receiver
22552
214
Frequency Measurements Using PC
25017
215
Contactless AC Mains Voltage Detector
14539
216
PC-Based 7-Segment Rolling Display
22917
217
Electronic Card-Lock System
46170
218
Miniature Strobe Light
20293
219
Automatic Dual-Output Display
14016
220
CD-ROM Drive As Digital-Audio CD-Player
38109
221
Clap Remote
21664
222
Wiper Speed Controller
17944
223
Water Level Indicator With Alarm
33371
224
IC Controlled Emergency Light With Charger
37269
225
Auto Reset Over/Under Voltage Cut-Out
7280
226
Smart Phone Light
13584
227
Automatic Emergency Light
21595
228
Telecom Headset
13005
229
Automatic Room Power Control
17209
230
Handy Zener Diode Tester
9434
231
Telephone Line Vigilant
9666
232
High and Low Voltage Cutout With Delay and Melody
7817
233
Colour Sensor
22227
234
Running Message Display
19208
235
Low Current, High Voltage Power Supply
10433
236
Audio-Visual Extra Ringer For Phone
6016
237
Solidstate Auto Power-Off/On Mains Failure
5698
238
7MHz CW/AM QRP Transmitter
7647
239
Intelligent Switch
17323
240
Fluid Level Detector
12519
241
Programmable Door-Bell With Flashing LEDs
9231
242
Clap Switch
13909
243
Computerised Morse Code Generator/Transmitter
6191
244
Accurate Electronic Stop-Watch
7662
245
Magic Lights
18991
246
Digital Dice With Numeric Display
9857
247
Sensitive Temperature Switch
10308
248
Automatic Temperature Controlled Fan
15144
249
Watch-Dog for Telephones
9770
250
FM Transmitter For Channel Changer
16753
251
UPS For Cordless Telephones
17747
252
Touch-Sensitive Musical Bell With Timer
7262
253
Programmable LED Indicator
11033
254
Economical Pump Controller
9476
255
Fire Alarm
17357
256
Short Wave AM Transmitter
11068
257
Automatic Emergency Torch
10524
258
Ramp Controlled Light
7029
259
Simple Intercom Circuit
13700
260
Tank Overflow Preventer
11524
261
33-Volt Tunning Voltage
8032
262
Appliance Timer
8942
263
Electronic Code Lock
17096
264
Flashing Brakelight
8532
265
IR Remote Control
20721
266
Car Anti-Theft Wireless Alarm
17108
267
Divide-By-N Counter Realisation Using ICs CD4033 And CD4017
9515
268
Soft Musical Telephone Ringer
6387
269
Low Cost Transistorised Inverter
14828
270
Automatic Telephone Answering Machine
13447
271
Hourly Chime Function Generator
6927
272
Programmable Priority Time Switch
8192
273
Digital Volume Control
16283
274
Extension Phone Switcher
6555
275
Battery Opeated High Voltage Source
10651
276
Handy Telephone Receiver
10382
277
A Highly Efficient DC Lamp Dimmer
8333
278
Low Cost Automatic Gate LIght With A Musical Bell
9277
279
Automatic Switch For Audio Power Amplifier
9392
280
Capacitance Bridge
9678
281
Darkness Controlled Light Switch
14386
282
AF/RF Signal Tracer
11021
283
Automatic Temperature Controller
14589
284
Simple Logic Probe
7618
285
Telephone Amplifier
9004
286
Ready -To-Use Object Counter
9157
287
Four-In-One Burglar Alarm
10463
288
Telephone Call Counter
11433
289
Water Level Controller Using 3-Phase Starter
10386
290
Running Lights Effect
11465
291
Programmable Musical Bell
7092
292
Solidstate Relay with Under/Over Voltage Protection
6116
293
Adjustable Dancing Lights
7139
294
Ultrasonic Switch
10551
295
Off-Line Telephone Tester
5611
296
Dancing Lights
11759
297
Versatile Variable Duration Digital Timer
4083
298
Programmable 8-Digit Code Lock
8036
299
Add Auto Start To Generators
4820
300
Sound Controlled Flip-Flop
5525
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