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Latest Issues

July 2009

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C I R C U I T L A B

1) Liquid Level Alarm (New)
2) Generator Room Light (New)

Click to view in order of 'highest hits first'

S No.	Circuit Name	Hits
1	PC Power Manager	1130
2	Skin Response Meter	1556
3	Solar Panel based Charger and Small LED Lamp	5569
4	Electronic Bicycle Lock	3644
5	Remote-operated Master Switch	6189
6	USB Power Socket	5025
7	Triple Power Supply	7246
8	Smart Hearing Aid	4329
9	Midnight Security Light	11101
10	Automated Alarm Circuits	8033
11	Traffic Baton	8565
12	Laser-guided Door Opener	12812
13	Battery-level Indicator	14068
14	PC Temperature Controller	11100
15	Traffic Controller	13485
16	Night Alert	12803
17	Muscular Stimulator	10225
18	Wireless Switch	26476
19	Long-Range IR Transmitter	14928
20	Electric Window Fence Charger	888
21	Three-Phase Appliance Protector	10565
22	PC Multimedia Speakers	18037
23	Aquarium Probe	12208
24	Bicycle Indicator	13111
25	Poor Man’s Hearing Aid	8048
26	Portable Lamp Flasher	10902
27	Staircase Light With Auto Switch-Off	14454
28	Car Anti-theft Guard	16397
29	USB Power Booster	20931
30	Smart Vibration Sensor	15735
31	Drinking Water alarm	23673
32	GLOW PLuG CONTROLLER	10269
33	Versatile CMOS TTL Logic And Clock Probe	7441
34	Tester For Remote Control	16029
35	Automatic Low-Power Emergency Light	24071
36	Mobile Bug	34714
37	LED Lighting for Christmas	23143
38	Current Sensor	22564
39	Seismic Sensor	18802
40	Dice With 7-Segment Display	16435
41	Motorbike Alarm	22488
42	Laptop Protector	35153
43	Shutter Guard	12451
44	Desktop Power Supply	20702
45	Mobile Shield	27962
46	Infrared Firecracker Igniter	20732
47	Automatic Phase Changer	21122
48	Flying Saucer	27841
49	Anti-Collision Rear Light	20365
50	Light Fence	21709
51	MAT Switch	18689
52	5-Band Graphic Equaliser	18848
53	Clock Timer	29034
54	Fully Automatic Emergency Light	36804
55	IR Music Transmitter and Receiver	41614
56	Electronic Horn	25855
57	Ultrasonic Proximity Detector	30184
58	Secret Bell	36237
59	Variable Power Supply Using a Fixed-Voltage Regulator IC	39059
60	Appliance Timer-Cum-Clap Switch	20582
61	Telephone-Operated Calling System	28483
62	Front Door Guard	30237
63	Bell-Cum Light Controller	19475
64	Friendly Charger for Mobile Phones	34851
65	Hearing Aid	25914
66	Speed Control of DC Motor Using Pulse-Width Modulation	35315
67	Remote-Controlled Fan Regulator	56503
68	Low-Power Voltage Doubler	21368
69	Parrot-Sounding AC Doorbell	20725
70	Multi-Melody Generator With Instrumental Effect	16147
71	School/College Quiz Buzzer	13784
72	Visual AC Mains Voltage Indicator	20228
73	Simple Short-Wave Transmitter	20962
74	Solar Lighting System	58861
75	Infrared Bug	33708
76	Picnic Lamp	28128
77	Versatile Power Supply	28221
78	Ultrasonic Proximity Detector	34526
79	Shadow Alarm	39409
80	IR Burglar Deterrent	50764
81	Versatile Water-Level Controller	36310
82	Automatic-Off Timer For CD Players	24749
83	Heat-Sensitive Switch	27814
84	Sensitive Vibration Detector	26532
85	Digital Dice	30088
86	Remote-Controlled Power-Off Switch	48653
87	Little Door Guard	33935
88	Stress Meter	34670
89	Teleconferencing System	38226
90	Medium-Power FM Transmitter	41223
91	Smart Cellphone Holder	33741
92	Fuel Reserve Indicator For Vehicles	30994
93	Brake Failure Indicator	34821
94	Safety Guard	25982
95	Mains Supply Failure Alarm	27524
96	Remote Control For Home Appliances	78918
97	Micromotor Controller	38370
98	Solar Bug	41434
99	Simple Digital Security System	45699
100	Digital Audio/Video Input Selector	20928
101	Auto Turn-Off Battery Charger	48885
102	Atmel AVR ISP Dongle	35015
103	Audio Amplifier for Personal Stereo	45765
104	Musical Light Chaser	39275
105	Water-Level Controller	66716
106	Hit Switch	41562
107	Fire Alarm Using Thermistor	40710
108	Electronic Watchdog	56141
109	Automatic School Bell	35852
110	Anti-Theft Alarm For Bikes	51998
111	DC Motor Control Using A Single Switch	41389
112	Solidstate Remote Control Switch	37098
113	Flashing-Cum-Running Light	33727
114	Quality FM Transmitter	75399
115	Stabilised Power Supply With Short-Circuit Indication	33039
116	Digital Stop Watch	46180
117	Cell-Phone-Controlled Audio/Video Mute Switch	46320
118	PC-Based DC Motor Speed Controller	57240
119	Child's Lamp	44520
120	Watchman Watcher	40310
121	Highway Alert Signal Lamp	30696
122	Low-Cost Electronic Quiz Table	28451
123	Mobile Cellphone Charger	72311
124	Smart Foot Switch	35043
125	Programmable Timer for Appliances	52563
126	Anti-Bag-Snatching Alarm	29791
127	LED-Based Message Display	79888
128	Multiband CW Transmitter	31697
129	Automatic Night Lamp With Morning Alarm	59254
130	Touch Dimmer	55708
131	Mosfet-Based Preamplifier for FM Radio DXing	39318
132	Non-Contact Power Monitor	28446
133	Remote-Operated Musical Bell	45712
134	Electronic Motor Starter	51422
135	Telephone Receiver	70940
136	Washing Machine Motor Controller	47486
137	Low-Cost Hearing Aid	42998
138	Over-/Under-Voltage Protection of Electrical Appliances	33695
139	Parallel Telephone With Secrecy and Call Prevention	43444
140	Voltage-Based Controller For Switches	25933
141	DTMF Receiver IC MT8870 Tester	57280
142	Pulse Generator	46489
143	Infrared Remote Control Timer	53074
144	Clap Switch	89514
145	Multi-Switch Doorbell With Indicators	29938
146	Song Number Display	41116
147	Lead-Acid Battery Charger With Voltage Analyser	60670
148	Electronic Security System	128779
149	Three-Colour Display Using Bicolour LEDs	49790
150	Ultra-Bright LED Lamp	78299
151	Computerised Universal Timer	41076
152	Number Guessing Game	36343
153	PC-Based Oscilloscope	235919
154	Intruder Radio Alert System	50279
155	Flashing Beacon	46886
156	Knock Alarm	63006
157	Automated Traffic Signal Controller	74306
158	Infrared Toy Car Motor Controller	193809
159	Mains Manager	36916
160	Crystal-Controlled Time-Base Generator	28682
161	Mains Operated Christmas Star	31327
162	Music On-Hold For Telephones	37816
163	Solidstate Switch For DC-Operated Gadgets	29944
164	Ding-Dong Bell	68199
165	IR Remote Switch	96811
166	Shortwave Transmitter	46800
167	FM Booster	95210
168	Laser Torch-Based Voice Transmitter And Receiver	75301
169	Mobile Phone Battery Charger	69245
170	Fastest Finger First Indicator	50857
171	Condenser Mic Audio Amplifier	64145
172	DarkRoom Timer	39893
173	Speller Effect Sign Display	32884
174	Stereo Tape Head Preamplifier For PC Sound Card	38950
175	A Hierarchical Priority Encoder	24962
176	Digital Mains Voltage Indicator	45470
177	Water-Level Controller	83541
178	Invisible Broken Wire Detector	72961
179	Anti-Theft Security For Car Audios	46140
180	Simple Telephone Ring Tone Generator	45170
181	Versatile Zener Diode Tester	37229
182	DTMF Proximity Detector	63637
183	Under-/Over-Voltage Beep for Manual Stabiliser	24972
184	15-Step Digital Power Supply	62579
185	Auto Shut-off For Cassette Players And Amplifiers	29353
186	House Security System	122282
187	Generation Of 1-Sec. Pulses Spaced 5-Sec. Apart	23122
188	9-Line Telephone Sharer	62879
189	Musical ‘Touch’ Bell	52844
190	Automatic Heat Detector	52709
191	Single Phase Electronic Starter	29943
192	Precision Amplifier With Digital Control	38717
193	Precision Attenuator With Digital Control	25097
194	Infrared Electronic Shooting Game	15272
195	Telephone Ringer Using Timer ICs	32188
196	Blown Fuse Indicator	30702
197	Automatic Speed-Controller For Fans and Coolers	48918
198	2-Line Intercom-Cum-Telephone Line Changeover Circuit	34506
199	Low-Cost PCO Billing Meter	37046
200	Telephone Line Based Audio Muting And Light-On Circuit	23654
201	Power-Supply Failure Alarm	44313
202	Add-On Stereo Channel Selector	24520
203	Parallel Telephones With Secrecy	31623
204	Telephone Number Display	63076
205	Luggage Security System	40987
206	Precision Digital AC Power Controller	32827
207	Phone BroadCaster	31364
208	Telephone Call Meter Using Calculator And COB	30613
209	Telephone Conversation Recorder	39627
210	Universal High-Resistance Voltmeter	23237
211	Protection For Your Electrical Appliances	30486
212	Simple Code Lock	52565
213	Time Switch	34381
214	Digital Speedometer	37582
215	Long-Range FM Transmitter	201707
216	Self-Switching Power Supply	30162
217	Electrical Equipment Control Using PC	77770
218	Teleremote Control	48564
219	Low-Cost Transistorised Intercom	34468
220	Charge Monitor For 12V Rechargeable Lead-Acid Battery	60409
221	Cordless Phone Backup	28743
222	Sleep-Switch Cum Wake-up Timer	24924
223	Simple Analogue To Digital Converter	33811
224	Dual-Channel Digital Volume Control	32822
225	Infrared Cordless Headphone	68109
226	Magnetic Proximity Switch	26824
227	Simple Low-Cost Digital Code Lock	40567
228	Ultra Low Drop Linear Regulator	14507
229	Simple Sensitive Remote Control Tester	16723
230	Electronic Scoring Game	21615
231	Tiny Dew Sensor	21898
232	Electronic Jam	48836
233	Precision 1Hz Clock Generator Using Chip-On-Board	17727
234	Digital Switching System	30333
235	40-Metre Direct Conversion Receiver	27412
236	Frequency Measurements Using PC	29852
237	Contactless AC Mains Voltage Detector	18383
238	PC-Based 7-Segment Rolling Display	28109
239	Electronic Card-Lock System	54675
240	Miniature Strobe Light	24882
241	Automatic Dual-Output Display	17365
242	CD-ROM Drive As Digital-Audio CD-Player	46385
243	Clap Remote	27566
244	Wiper Speed Controller	22279
245	Water Level Indicator With Alarm	43166
246	IC Controlled Emergency Light With Charger	45261
247	Auto Reset Over/Under Voltage Cut-Out	7557
248	Smart Phone Light	17610
249	Automatic Emergency Light	30555
250	Telecom Headset	16711
251	Automatic Room Power Control	23642
252	Handy Zener Diode Tester	12975
253	Telephone Line Vigilant	12615
254	High and Low Voltage Cutout With Delay and Melody	10695
255	Colour Sensor	30986
256	Running Message Display	26460
257	Low Current, High Voltage Power Supply	14217
258	Audio-Visual Extra Ringer For Phone	8376
259	Solidstate Auto Power-Off/On Mains Failure	5977
260	7MHz CW/AM QRP Transmitter	7926
261	Intelligent Switch	25587
262	Fluid Level Detector	17635
263	Programmable Door-Bell With Flashing LEDs	12980
264	Clap Switch	22627
265	Computerised Morse Code Generator/Transmitter	6468
266	Accurate Electronic Stop-Watch	11047
267	Magic Lights	27967
268	Digital Dice With Numeric Display	14265
269	Sensitive Temperature Switch	14706
270	Automatic Temperature Controlled Fan	21946
271	Watch-Dog for Telephones	14004
272	FM Transmitter For Channel Changer	23147
273	UPS For Cordless Telephones	25254
274	Touch-Sensitive Musical Bell With Timer	10785
275	Programmable LED Indicator	15922
276	Economical Pump Controller	14223
277	Fire Alarm	27082
278	Short Wave AM Transmitter	15274
279	Automatic Emergency Torch	15834
280	Ramp Controlled Light	10291
281	Simple Intercom Circuit	19765
282	Tank Overflow Preventer	17938
283	33-Volt Tunning Voltage	11658
284	Appliance Timer	12718
285	Electronic Code Lock	25878
286	Flashing Brakelight	12739
287	IR Remote Control	29446
288	Car Anti-Theft Wireless Alarm	23950
289	Divide-By-N Counter Realisation Using ICs CD4033 And CD4017	14102
290	Soft Musical Telephone Ringer	9412
291	Low Cost Transistorised Inverter	22922
292	Automatic Telephone Answering Machine	19610
293	Hourly Chime Function Generator	10309
294	Programmable Priority Time Switch	11724
295	Digital Volume Control	24072
296	Extension Phone Switcher	9391
297	Battery Opeated High Voltage Source	15747
298	Handy Telephone Receiver	15154
299	A Highly Efficient DC Lamp Dimmer	12001
300	Low Cost Automatic Gate LIght With A Musical Bell	14018