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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	1038
2	Skin Response Meter	1442
3	Solar Panel based Charger and Small LED Lamp	5485
4	Electronic Bicycle Lock	3576
5	Remote-operated Master Switch	6140
6	USB Power Socket	4960
7	Triple Power Supply	7196
8	Smart Hearing Aid	4286
9	Midnight Security Light	11052
10	Automated Alarm Circuits	7984
11	Traffic Baton	8531
12	Laser-guided Door Opener	12753
13	Battery-level Indicator	14015
14	PC Temperature Controller	11057
15	Traffic Controller	13440
16	Night Alert	12750
17	Muscular Stimulator	10182
18	Wireless Switch	26380
19	Long-Range IR Transmitter	14888
20	Electric Window Fence Charger	854
21	Three-Phase Appliance Protector	10541
22	PC Multimedia Speakers	17990
23	Aquarium Probe	12180
24	Bicycle Indicator	13089
25	Poor Man’s Hearing Aid	8025
26	Portable Lamp Flasher	10877
27	Staircase Light With Auto Switch-Off	14426
28	Car Anti-theft Guard	16364
29	USB Power Booster	20900
30	Smart Vibration Sensor	15709
31	Drinking Water alarm	23630
32	GLOW PLuG CONTROLLER	10255
33	Versatile CMOS TTL Logic And Clock Probe	7430
34	Tester For Remote Control	16008
35	Automatic Low-Power Emergency Light	24043
36	Mobile Bug	34651
37	LED Lighting for Christmas	23107
38	Current Sensor	22529
39	Seismic Sensor	18778
40	Dice With 7-Segment Display	16417
41	Motorbike Alarm	22455
42	Laptop Protector	35079
43	Shutter Guard	12432
44	Desktop Power Supply	20677
45	Mobile Shield	27939
46	Infrared Firecracker Igniter	20711
47	Automatic Phase Changer	21088
48	Flying Saucer	27803
49	Anti-Collision Rear Light	20340
50	Light Fence	21679
51	MAT Switch	18666
52	5-Band Graphic Equaliser	18824
53	Clock Timer	29009
54	Fully Automatic Emergency Light	36764
55	IR Music Transmitter and Receiver	41570
56	Electronic Horn	25820
57	Ultrasonic Proximity Detector	30157
58	Secret Bell	36193
59	Variable Power Supply Using a Fixed-Voltage Regulator IC	39029
60	Appliance Timer-Cum-Clap Switch	20565
61	Telephone-Operated Calling System	28453
62	Front Door Guard	30211
63	Bell-Cum Light Controller	19455
64	Friendly Charger for Mobile Phones	34822
65	Hearing Aid	25892
66	Speed Control of DC Motor Using Pulse-Width Modulation	35282
67	Remote-Controlled Fan Regulator	56453
68	Low-Power Voltage Doubler	21343
69	Parrot-Sounding AC Doorbell	20702
70	Multi-Melody Generator With Instrumental Effect	16129
71	School/College Quiz Buzzer	13784
72	Visual AC Mains Voltage Indicator	20215
73	Simple Short-Wave Transmitter	20948
74	Solar Lighting System	58815
75	Infrared Bug	33688
76	Picnic Lamp	28102
77	Versatile Power Supply	28201
78	Ultrasonic Proximity Detector	34501
79	Shadow Alarm	39385
80	IR Burglar Deterrent	50739
81	Versatile Water-Level Controller	36285
82	Automatic-Off Timer For CD Players	24730
83	Heat-Sensitive Switch	27797
84	Sensitive Vibration Detector	26515
85	Digital Dice	30071
86	Remote-Controlled Power-Off Switch	48616
87	Little Door Guard	33907
88	Stress Meter	34640
89	Teleconferencing System	38190
90	Medium-Power FM Transmitter	41205
91	Smart Cellphone Holder	33713
92	Fuel Reserve Indicator For Vehicles	30980
93	Brake Failure Indicator	34788
94	Safety Guard	25967
95	Mains Supply Failure Alarm	27504
96	Remote Control For Home Appliances	78876
97	Micromotor Controller	38353
98	Solar Bug	41400
99	Simple Digital Security System	45680
100	Digital Audio/Video Input Selector	20927
101	Auto Turn-Off Battery Charger	48854
102	Atmel AVR ISP Dongle	34982
103	Audio Amplifier for Personal Stereo	45746
104	Musical Light Chaser	39245
105	Water-Level Controller	66681
106	Hit Switch	41539
107	Fire Alarm Using Thermistor	40692
108	Electronic Watchdog	56114
109	Automatic School Bell	35836
110	Anti-Theft Alarm For Bikes	51965
111	DC Motor Control Using A Single Switch	41368
112	Solidstate Remote Control Switch	37078
113	Flashing-Cum-Running Light	33709
114	Quality FM Transmitter	75368
115	Stabilised Power Supply With Short-Circuit Indication	33024
116	Digital Stop Watch	46148
117	Cell-Phone-Controlled Audio/Video Mute Switch	46314
118	PC-Based DC Motor Speed Controller	57213
119	Child's Lamp	44503
120	Watchman Watcher	40286
121	Highway Alert Signal Lamp	30673
122	Low-Cost Electronic Quiz Table	28437
123	Mobile Cellphone Charger	72266
124	Smart Foot Switch	35022
125	Programmable Timer for Appliances	52539
126	Anti-Bag-Snatching Alarm	29780
127	LED-Based Message Display	79845
128	Multiband CW Transmitter	31685
129	Automatic Night Lamp With Morning Alarm	59229
130	Touch Dimmer	55679
131	Mosfet-Based Preamplifier for FM Radio DXing	39306
132	Non-Contact Power Monitor	28436
133	Remote-Operated Musical Bell	45700
134	Electronic Motor Starter	51402
135	Telephone Receiver	70913
136	Washing Machine Motor Controller	47468
137	Low-Cost Hearing Aid	42979
138	Over-/Under-Voltage Protection of Electrical Appliances	33692
139	Parallel Telephone With Secrecy and Call Prevention	43432
140	Voltage-Based Controller For Switches	25922
141	DTMF Receiver IC MT8870 Tester	57267
142	Pulse Generator	46466
143	Infrared Remote Control Timer	53060
144	Clap Switch	89481
145	Multi-Switch Doorbell With Indicators	29926
146	Song Number Display	41101
147	Lead-Acid Battery Charger With Voltage Analyser	60643
148	Electronic Security System	128715
149	Three-Colour Display Using Bicolour LEDs	49777
150	Ultra-Bright LED Lamp	78259
151	Computerised Universal Timer	41062
152	Number Guessing Game	36334
153	PC-Based Oscilloscope	235837
154	Intruder Radio Alert System	50260
155	Flashing Beacon	46868
156	Knock Alarm	62977
157	Automated Traffic Signal Controller	74278
158	Infrared Toy Car Motor Controller	193763
159	Mains Manager	36906
160	Crystal-Controlled Time-Base Generator	28671
161	Mains Operated Christmas Star	31312
162	Music On-Hold For Telephones	37806
163	Solidstate Switch For DC-Operated Gadgets	29934
164	Ding-Dong Bell	68168
165	IR Remote Switch	96787
166	Shortwave Transmitter	46785
167	FM Booster	95180
168	Laser Torch-Based Voice Transmitter And Receiver	75273
169	Mobile Phone Battery Charger	69216
170	Fastest Finger First Indicator	50826
171	Condenser Mic Audio Amplifier	64119
172	DarkRoom Timer	39880
173	Speller Effect Sign Display	32873
174	Stereo Tape Head Preamplifier For PC Sound Card	38940
175	A Hierarchical Priority Encoder	24949
176	Digital Mains Voltage Indicator	45450
177	Water-Level Controller	83496
178	Invisible Broken Wire Detector	72933
179	Anti-Theft Security For Car Audios	46129
180	Simple Telephone Ring Tone Generator	45158
181	Versatile Zener Diode Tester	37209
182	DTMF Proximity Detector	63621
183	Under-/Over-Voltage Beep for Manual Stabiliser	24969
184	15-Step Digital Power Supply	62552
185	Auto Shut-off For Cassette Players And Amplifiers	29342
186	House Security System	122211
187	Generation Of 1-Sec. Pulses Spaced 5-Sec. Apart	23112
188	9-Line Telephone Sharer	62862
189	Musical ‘Touch’ Bell	52825
190	Automatic Heat Detector	52688
191	Single Phase Electronic Starter	29930
192	Precision Amplifier With Digital Control	38706
193	Precision Attenuator With Digital Control	25084
194	Infrared Electronic Shooting Game	15258
195	Telephone Ringer Using Timer ICs	32178
196	Blown Fuse Indicator	30679
197	Automatic Speed-Controller For Fans and Coolers	48895
198	2-Line Intercom-Cum-Telephone Line Changeover Circuit	34492
199	Low-Cost PCO Billing Meter	37023
200	Telephone Line Based Audio Muting And Light-On Circuit	23635
201	Power-Supply Failure Alarm	44296
202	Add-On Stereo Channel Selector	24511
203	Parallel Telephones With Secrecy	31610
204	Telephone Number Display	63049
205	Luggage Security System	40961
206	Precision Digital AC Power Controller	32814
207	Phone BroadCaster	31350
208	Telephone Call Meter Using Calculator And COB	30599
209	Telephone Conversation Recorder	39598
210	Universal High-Resistance Voltmeter	23226
211	Protection For Your Electrical Appliances	30467
212	Simple Code Lock	52528
213	Time Switch	34362
214	Digital Speedometer	37543
215	Long-Range FM Transmitter	201630
216	Self-Switching Power Supply	30141
217	Electrical Equipment Control Using PC	77743
218	Teleremote Control	48542
219	Low-Cost Transistorised Intercom	34453
220	Charge Monitor For 12V Rechargeable Lead-Acid Battery	60379
221	Cordless Phone Backup	28732
222	Sleep-Switch Cum Wake-up Timer	24908
223	Simple Analogue To Digital Converter	33789
224	Dual-Channel Digital Volume Control	32804
225	Infrared Cordless Headphone	68085
226	Magnetic Proximity Switch	26812
227	Simple Low-Cost Digital Code Lock	40551
228	Ultra Low Drop Linear Regulator	14498
229	Simple Sensitive Remote Control Tester	16716
230	Electronic Scoring Game	21604
231	Tiny Dew Sensor	21882
232	Electronic Jam	48806
233	Precision 1Hz Clock Generator Using Chip-On-Board	17717
234	Digital Switching System	30313
235	40-Metre Direct Conversion Receiver	27386
236	Frequency Measurements Using PC	29837
237	Contactless AC Mains Voltage Detector	18374
238	PC-Based 7-Segment Rolling Display	28087
239	Electronic Card-Lock System	54645
240	Miniature Strobe Light	24866
241	Automatic Dual-Output Display	17355
242	CD-ROM Drive As Digital-Audio CD-Player	46359
243	Clap Remote	27547
244	Wiper Speed Controller	22271
245	Water Level Indicator With Alarm	43120
246	IC Controlled Emergency Light With Charger	45231
247	Auto Reset Over/Under Voltage Cut-Out	7556
248	Smart Phone Light	17595
249	Automatic Emergency Light	30531
250	Telecom Headset	16696
251	Automatic Room Power Control	23626
252	Handy Zener Diode Tester	12959
253	Telephone Line Vigilant	12603
254	High and Low Voltage Cutout With Delay and Melody	10685
255	Colour Sensor	30953
256	Running Message Display	26436
257	Low Current, High Voltage Power Supply	14202
258	Audio-Visual Extra Ringer For Phone	8367
259	Solidstate Auto Power-Off/On Mains Failure	5976
260	7MHz CW/AM QRP Transmitter	7925
261	Intelligent Switch	25553
262	Fluid Level Detector	17617
263	Programmable Door-Bell With Flashing LEDs	12966
264	Clap Switch	22593
265	Computerised Morse Code Generator/Transmitter	6467
266	Accurate Electronic Stop-Watch	11037
267	Magic Lights	27918
268	Digital Dice With Numeric Display	14250
269	Sensitive Temperature Switch	14693
270	Automatic Temperature Controlled Fan	21920
271	Watch-Dog for Telephones	13994
272	FM Transmitter For Channel Changer	23129
273	UPS For Cordless Telephones	25226
274	Touch-Sensitive Musical Bell With Timer	10772
275	Programmable LED Indicator	15904
276	Economical Pump Controller	14212
277	Fire Alarm	27050
278	Short Wave AM Transmitter	15262
279	Automatic Emergency Torch	15817
280	Ramp Controlled Light	10278
281	Simple Intercom Circuit	19749
282	Tank Overflow Preventer	17910
283	33-Volt Tunning Voltage	11641
284	Appliance Timer	12707
285	Electronic Code Lock	25843
286	Flashing Brakelight	12725
287	IR Remote Control	29405
288	Car Anti-Theft Wireless Alarm	23921
289	Divide-By-N Counter Realisation Using ICs CD4033 And CD4017	14090
290	Soft Musical Telephone Ringer	9400
291	Low Cost Transistorised Inverter	22894
292	Automatic Telephone Answering Machine	19594
293	Hourly Chime Function Generator	10298
294	Programmable Priority Time Switch	11711
295	Digital Volume Control	24043
296	Extension Phone Switcher	9382
297	Battery Opeated High Voltage Source	15722
298	Handy Telephone Receiver	15134
299	A Highly Efficient DC Lamp Dimmer	11976
300	Low Cost Automatic Gate LIght With A Musical Bell	13975