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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