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Latest Issues
May 2008
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C
I R C U I T L A B
1
)
Staircase Light With Auto Switch-Off
(New)
2
)
Car Anti-theft Guard
(New)
Click to view in order of 'highest hits first'
S No.
Circuit Name
Hits
1
USB Power Booster
1596
2
Smart Vibration Sensor
1671
3
Drinking Water alarm
3731
4
GLOW PLuG CONTROLLER
1796
5
Versatile CMOS TTL Logic And Clock Probe
1357
6
Tester For Remote Control
3976
7
Automatic Low-Power Emergency Light
8213
8
Mobile Bug
8658
9
LED Lighting for Christmas
7307
10
Current Sensor
7747
11
Seismic Sensor
7097
12
Dice With 7-Segment Display
5304
13
Motorbike Alarm
9183
14
Laptop Protector
12116
15
Shutter Guard
5774
16
Desktop Power Supply
8850
17
Mobile Shield
13408
18
Infrared Firecracker Igniter
9605
19
Automatic Phase Changer
10315
20
Flying Saucer
12997
21
Anti-Collision Rear Light
10960
22
Light Fence
11407
23
MAT Switch
9620
24
5-Band Graphic Equaliser
9082
25
Clock Timer
16457
26
Fully Automatic Emergency Light
20481
27
IR Music Transmitter and Receiver
24729
28
Electronic Horn
14819
29
Ultrasonic Proximity Detector
17736
30
Secret Bell
20892
31
Variable Power Supply Using a Fixed-Voltage Regulator IC
24251
32
Appliance Timer-Cum-Clap Switch
12164
33
Telephone-Operated Calling System
17979
34
Front Door Guard
18804
35
Bell-Cum Light Controller
12472
36
Friendly Charger for Mobile Phones
20849
37
Hearing Aid
16349
38
Speed Control of DC Motor Using Pulse-Width Modulation
21434
39
Remote-Controlled Fan Regulator
36048
40
Low-Power Voltage Doubler
13607
41
Parrot-Sounding AC Doorbell
13811
42
Multi-Melody Generator With Instrumental Effect
10410
43
School/College Quiz Buzzer
13734
44
Visual AC Mains Voltage Indicator
13240
45
Simple Short-Wave Transmitter
14554
46
Solar Lighting System
37080
47
Infrared Bug
24112
48
Picnic Lamp
19831
49
Versatile Power Supply
21223
50
Ultrasonic Proximity Detector
25962
51
Shadow Alarm
28377
52
IR Burglar Deterrent
28343
53
Versatile Water-Level Controller
24853
54
Automatic-Off Timer For CD Players
17853
55
Heat-Sensitive Switch
20137
56
Sensitive Vibration Detector
20144
57
Digital Dice
22041
58
Remote-Controlled Power-Off Switch
35935
59
Little Door Guard
26379
60
Stress Meter
24264
61
Teleconferencing System
28697
62
Medium-Power FM Transmitter
31608
63
Smart Cellphone Holder
25887
64
Fuel Reserve Indicator For Vehicles
23493
65
Brake Failure Indicator
25675
66
Safety Guard
19679
67
Mains Supply Failure Alarm
20732
68
Remote Control For Home Appliances
59250
69
Micromotor Controller
29427
70
Solar Bug
31304
71
Simple Digital Security System
35510
72
Digital Audio/Video Input Selector
20528
73
Auto Turn-Off Battery Charger
36355
74
Atmel AVR ISP Dongle
25928
75
Audio Amplifier for Personal Stereo
36522
76
Musical Light Chaser
30754
77
Water-Level Controller
51571
78
Hit Switch
32740
79
Fire Alarm Using Thermistor
31420
80
Electronic Watchdog
43156
81
Automatic School Bell
28176
82
Anti-Theft Alarm For Bikes
41087
83
DC Motor Control Using A Single Switch
32777
84
Solidstate Remote Control Switch
30721
85
Flashing-Cum-Running Light
27397
86
Quality FM Transmitter
61717
87
Stabilised Power Supply With Short-Circuit Indication
27058
88
Digital Stop Watch
37599
89
Cell-Phone-Controlled Audio/Video Mute Switch
44135
90
PC-Based DC Motor Speed Controller
47474
91
Child's Lamp
36145
92
Watchman Watcher
31840
93
Highway Alert Signal Lamp
24999
94
Low-Cost Electronic Quiz Table
22981
95
Mobile Cellphone Charger
55171
96
Smart Foot Switch
28619
97
Programmable Timer for Appliances
44627
98
Anti-Bag-Snatching Alarm
24525
99
LED-Based Message Display
66158
100
Multiband CW Transmitter
27202
101
Automatic Night Lamp With Morning Alarm
49917
102
Touch Dimmer
45328
103
Mosfet-Based Preamplifier for FM Radio DXing
31268
104
Non-Contact Power Monitor
24058
105
Remote-Operated Musical Bell
40275
106
Electronic Motor Starter
43241
107
Telephone Receiver
62211
108
Washing Machine Motor Controller
40242
109
Low-Cost Hearing Aid
36999
110
Over-/Under-Voltage Protection of Electrical Appliances
33111
111
Parallel Telephone With Secrecy and Call Prevention
37787
112
Voltage-Based Controller For Switches
21936
113
DTMF Receiver IC MT8870 Tester
49955
114
Pulse Generator
39282
115
Infrared Remote Control Timer
46300
116
Clap Switch
75105
117
Multi-Switch Doorbell With Indicators
26084
118
Song Number Display
35307
119
Lead-Acid Battery Charger With Voltage Analyser
51925
120
Electronic Security System
95943
121
Three-Colour Display Using Bicolour LEDs
43115
122
Ultra-Bright LED Lamp
62859
123
Computerised Universal Timer
35700
124
Number Guessing Game
30770
125
PC-Based Oscilloscope
205093
126
Intruder Radio Alert System
44417
127
Flashing Beacon
40046
128
Knock Alarm
54832
129
Automated Traffic Signal Controller
63281
130
Infrared Toy Car Motor Controller
170878
131
Mains Manager
31936
132
Crystal-Controlled Time-Base Generator
24985
133
Mains Operated Christmas Star
27191
134
Music On-Hold For Telephones
34015
135
Solidstate Switch For DC-Operated Gadgets
25575
136
Ding-Dong Bell
57854
137
IR Remote Switch
83042
138
Shortwave Transmitter
40035
139
FM Booster
83583
140
Laser Torch-Based Voice Transmitter And Receiver
65715
141
Mobile Phone Battery Charger
55668
142
Fastest Finger First Indicator
42122
143
Condenser Mic Audio Amplifier
55508
144
DarkRoom Timer
33585
145
Speller Effect Sign Display
28313
146
Stereo Tape Head Preamplifier For PC Sound Card
33786
147
A Hierarchical Priority Encoder
21044
148
Digital Mains Voltage Indicator
38056
149
Water-Level Controller
67814
150
Invisible Broken Wire Detector
61161
151
Anti-Theft Security For Car Audios
40168
152
Simple Telephone Ring Tone Generator
39626
153
Versatile Zener Diode Tester
31530
154
DTMF Proximity Detector
56428
155
Under-/Over-Voltage Beep for Manual Stabiliser
24206
156
15-Step Digital Power Supply
54288
157
Auto Shut-off For Cassette Players And Amplifiers
25483
158
House Security System
93665
159
Generation Of 1-Sec. Pulses Spaced 5-Sec. Apart
19379
160
9-Line Telephone Sharer
55729
161
Musical ‘Touch’ Bell
48146
162
Automatic Heat Detector
44518
163
Single Phase Electronic Starter
24147
164
Precision Amplifier With Digital Control
33908
165
Precision Attenuator With Digital Control
20733
166
Infrared Electronic Shooting Game
9632
167
Telephone Ringer Using Timer ICs
27623
168
Blown Fuse Indicator
24912
169
Automatic Speed-Controller For Fans and Coolers
39814
170
2-Line Intercom-Cum-Telephone Line Changeover Circuit
29425
171
Low-Cost PCO Billing Meter
31383
172
Telephone Line Based Audio Muting And Light-On Circuit
19784
173
Power-Supply Failure Alarm
36820
174
Add-On Stereo Channel Selector
20875
175
Parallel Telephones With Secrecy
27182
176
Telephone Number Display
53907
177
Luggage Security System
34224
178
Precision Digital AC Power Controller
27392
179
Phone BroadCaster
26370
180
Telephone Call Meter Using Calculator And COB
25006
181
Telephone Conversation Recorder
32837
182
Universal High-Resistance Voltmeter
18679
183
Protection For Your Electrical Appliances
23922
184
Simple Code Lock
41340
185
Time Switch
26761
186
Digital Speedometer
22990
187
Long-Range FM Transmitter
169997
188
Self-Switching Power Supply
24478
189
Electrical Equipment Control Using PC
67207
190
Teleremote Control
40306
191
Low-Cost Transistorised Intercom
28368
192
Charge Monitor For 12V Rechargeable Lead-Acid Battery
48263
193
Cordless Phone Backup
24211
194
Sleep-Switch Cum Wake-up Timer
19534
195
Simple Analogue To Digital Converter
27484
196
Dual-Channel Digital Volume Control
27190
197
Infrared Cordless Headphone
58124
198
Magnetic Proximity Switch
21015
199
Simple Low-Cost Digital Code Lock
33642
200
Ultra Low Drop Linear Regulator
11107
201
Simple Sensitive Remote Control Tester
12779
202
Electronic Scoring Game
16047
203
Tiny Dew Sensor
16744
204
Electronic Jam
38196
205
Precision 1Hz Clock Generator Using Chip-On-Board
12793
206
Digital Switching System
23114
207
40-Metre Direct Conversion Receiver
21141
208
Frequency Measurements Using PC
23634
209
Contactless AC Mains Voltage Detector
13396
210
PC-Based 7-Segment Rolling Display
21423
211
Electronic Card-Lock System
43739
212
Miniature Strobe Light
18958
213
Automatic Dual-Output Display
13049
214
CD-ROM Drive As Digital-Audio CD-Player
35618
215
Clap Remote
20077
216
Wiper Speed Controller
16759
217
Water Level Indicator With Alarm
30681
218
IC Controlled Emergency Light With Charger
34965
219
Auto Reset Over/Under Voltage Cut-Out
7176
220
Smart Phone Light
12473
221
Automatic Emergency Light
18864
222
Telecom Headset
11907
223
Automatic Room Power Control
15358
224
Handy Zener Diode Tester
8389
225
Telephone Line Vigilant
8785
226
High and Low Voltage Cutout With Delay and Melody
6796
227
Colour Sensor
20019
228
Running Message Display
17315
229
Low Current, High Voltage Power Supply
9127
230
Audio-Visual Extra Ringer For Phone
5325
231
Solidstate Auto Power-Off/On Mains Failure
5596
232
7MHz CW/AM QRP Transmitter
7540
233
Intelligent Switch
15141
234
Fluid Level Detector
11169
235
Programmable Door-Bell With Flashing LEDs
8141
236
Clap Switch
11762
237
Computerised Morse Code Generator/Transmitter
6089
238
Accurate Electronic Stop-Watch
6690
239
Magic Lights
16996
240
Digital Dice With Numeric Display
8694
241
Sensitive Temperature Switch
9055
242
Automatic Temperature Controlled Fan
13219
243
Watch-Dog for Telephones
8609
244
FM Transmitter For Channel Changer
14945
245
UPS For Cordless Telephones
14935
246
Touch-Sensitive Musical Bell With Timer
6230
247
Programmable LED Indicator
9719
248
Economical Pump Controller
8144
249
Fire Alarm
14920
250
Short Wave AM Transmitter
9901
251
Automatic Emergency Torch
9093
252
Ramp Controlled Light
6090
253
Simple Intercom Circuit
12041
254
Tank Overflow Preventer
9852
255
33-Volt Tunning Voltage
6974
256
Appliance Timer
7943
257
Electronic Code Lock
15032
258
Flashing Brakelight
7460
259
IR Remote Control
18450
260
Car Anti-Theft Wireless Alarm
15301
261
Divide-By-N Counter Realisation Using ICs CD4033 And CD4017
8067
262
Soft Musical Telephone Ringer
5614
263
Low Cost Transistorised Inverter
12773
264
Automatic Telephone Answering Machine
11866
265
Hourly Chime Function Generator
5829
266
Programmable Priority Time Switch
7070
267
Digital Volume Control
14423
268
Extension Phone Switcher
5679
269
Battery Opeated High Voltage Source
9262
270
Handy Telephone Receiver
9306
271
A Highly Efficient DC Lamp Dimmer
7252
272
Low Cost Automatic Gate LIght With A Musical Bell
8085
273
Automatic Switch For Audio Power Amplifier
8153
274
Capacitance Bridge
8393
275
Darkness Controlled Light Switch
12679
276
AF/RF Signal Tracer
11008
277
Automatic Temperature Controller
12441
278
Simple Logic Probe
6634
279
Telephone Amplifier
7700
280
Ready -To-Use Object Counter
7711
281
Four-In-One Burglar Alarm
8753
282
Telephone Call Counter
9879
283
Water Level Controller Using 3-Phase Starter
8634
284
Running Lights Effect
9845
285
Programmable Musical Bell
5991
286
Solidstate Relay with Under/Over Voltage Protection
6014
287
Adjustable Dancing Lights
5953
288
Ultrasonic Switch
8571
289
Off-Line Telephone Tester
4223
290
Dancing Lights
9261
291
Versatile Variable Duration Digital Timer
3122
292
Programmable 8-Digit Code Lock
6145
293
Add Auto Start To Generators
3379
294
Sound Controlled Flip-Flop
3664
295
Tacho for Microprocessor Based Drives
3633
296
Low Cost Electronic Clock
6260
297
PC Based Digital Clock
5925
298
Powerful AM Radio Transmitter
6171
299
Fancy Christmas Light
3249
300
A Low Distortion Audio Pre-amplifier
4944
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