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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	1064
2	Skin Response Meter	1467
3	Solar Panel based Charger and Small LED Lamp	5506
4	Electronic Bicycle Lock	3600
5	Remote-operated Master Switch	6154
6	USB Power Socket	4978
7	Triple Power Supply	7213
8	Smart Hearing Aid	4291
9	Midnight Security Light	11066
10	Automated Alarm Circuits	7995
11	Traffic Baton	8542
12	Laser-guided Door Opener	12770
13	Battery-level Indicator	14030
14	PC Temperature Controller	11068
15	Traffic Controller	13455
16	Night Alert	12768
17	Muscular Stimulator	10199
18	Wireless Switch	26412
19	Long-Range IR Transmitter	14896
20	Electric Window Fence Charger	865
21	Three-Phase Appliance Protector	10546
22	PC Multimedia Speakers	18009
23	Aquarium Probe	12191
24	Bicycle Indicator	13097
25	Poor Man’s Hearing Aid	8029
26	Portable Lamp Flasher	10888
27	Staircase Light With Auto Switch-Off	14438
28	Car Anti-theft Guard	16373
29	USB Power Booster	20910
30	Smart Vibration Sensor	15718
31	Drinking Water alarm	23639
32	GLOW PLuG CONTROLLER	10257
33	Versatile CMOS TTL Logic And Clock Probe	7434
34	Tester For Remote Control	16014
35	Automatic Low-Power Emergency Light	24051
36	Mobile Bug	34665
37	LED Lighting for Christmas	23118
38	Current Sensor	22542
39	Seismic Sensor	18785
40	Dice With 7-Segment Display	16423
41	Motorbike Alarm	22465
42	Laptop Protector	35105
43	Shutter Guard	12435
44	Desktop Power Supply	20690
45	Mobile Shield	27945
46	Infrared Firecracker Igniter	20721
47	Automatic Phase Changer	21101
48	Flying Saucer	27815
49	Anti-Collision Rear Light	20346
50	Light Fence	21692
51	MAT Switch	18674
52	5-Band Graphic Equaliser	18832
53	Clock Timer	29021
54	Fully Automatic Emergency Light	36778
55	IR Music Transmitter and Receiver	41587
56	Electronic Horn	25832
57	Ultrasonic Proximity Detector	30164
58	Secret Bell	36205
59	Variable Power Supply Using a Fixed-Voltage Regulator IC	39038
60	Appliance Timer-Cum-Clap Switch	20572
61	Telephone-Operated Calling System	28465
62	Front Door Guard	30222
63	Bell-Cum Light Controller	19464
64	Friendly Charger for Mobile Phones	34833
65	Hearing Aid	25899
66	Speed Control of DC Motor Using Pulse-Width Modulation	35294
67	Remote-Controlled Fan Regulator	56468
68	Low-Power Voltage Doubler	21350
69	Parrot-Sounding AC Doorbell	20709
70	Multi-Melody Generator With Instrumental Effect	16133
71	School/College Quiz Buzzer	13784
72	Visual AC Mains Voltage Indicator	20220
73	Simple Short-Wave Transmitter	20952
74	Solar Lighting System	58831
75	Infrared Bug	33695
76	Picnic Lamp	28115
77	Versatile Power Supply	28206
78	Ultrasonic Proximity Detector	34508
79	Shadow Alarm	39393
80	IR Burglar Deterrent	50744
81	Versatile Water-Level Controller	36294
82	Automatic-Off Timer For CD Players	24737
83	Heat-Sensitive Switch	27801
84	Sensitive Vibration Detector	26522
85	Digital Dice	30075
86	Remote-Controlled Power-Off Switch	48625
87	Little Door Guard	33916
88	Stress Meter	34653
89	Teleconferencing System	38206
90	Medium-Power FM Transmitter	41213
91	Smart Cellphone Holder	33724
92	Fuel Reserve Indicator For Vehicles	30986
93	Brake Failure Indicator	34796
94	Safety Guard	25973
95	Mains Supply Failure Alarm	27512
96	Remote Control For Home Appliances	78896
97	Micromotor Controller	38358
98	Solar Bug	41412
99	Simple Digital Security System	45687
100	Digital Audio/Video Input Selector	20928
101	Auto Turn-Off Battery Charger	48863
102	Atmel AVR ISP Dongle	34995
103	Audio Amplifier for Personal Stereo	45753
104	Musical Light Chaser	39256
105	Water-Level Controller	66698
106	Hit Switch	41550
107	Fire Alarm Using Thermistor	40701
108	Electronic Watchdog	56126
109	Automatic School Bell	35842
110	Anti-Theft Alarm For Bikes	51978
111	DC Motor Control Using A Single Switch	41372
112	Solidstate Remote Control Switch	37084
113	Flashing-Cum-Running Light	33719
114	Quality FM Transmitter	75385
115	Stabilised Power Supply With Short-Circuit Indication	33032
116	Digital Stop Watch	46163
117	Cell-Phone-Controlled Audio/Video Mute Switch	46317
118	PC-Based DC Motor Speed Controller	57225
119	Child's Lamp	44509
120	Watchman Watcher	40297
121	Highway Alert Signal Lamp	30683
122	Low-Cost Electronic Quiz Table	28442
123	Mobile Cellphone Charger	72280
124	Smart Foot Switch	35031
125	Programmable Timer for Appliances	52547
126	Anti-Bag-Snatching Alarm	29786
127	LED-Based Message Display	79859
128	Multiband CW Transmitter	31690
129	Automatic Night Lamp With Morning Alarm	59240
130	Touch Dimmer	55689
131	Mosfet-Based Preamplifier for FM Radio DXing	39313
132	Non-Contact Power Monitor	28441
133	Remote-Operated Musical Bell	45707
134	Electronic Motor Starter	51407
135	Telephone Receiver	70923
136	Washing Machine Motor Controller	47476
137	Low-Cost Hearing Aid	42986
138	Over-/Under-Voltage Protection of Electrical Appliances	33692
139	Parallel Telephone With Secrecy and Call Prevention	43440
140	Voltage-Based Controller For Switches	25926
141	DTMF Receiver IC MT8870 Tester	57274
142	Pulse Generator	46477
143	Infrared Remote Control Timer	53064
144	Clap Switch	89494
145	Multi-Switch Doorbell With Indicators	29931
146	Song Number Display	41108
147	Lead-Acid Battery Charger With Voltage Analyser	60652
148	Electronic Security System	128734
149	Three-Colour Display Using Bicolour LEDs	49783
150	Ultra-Bright LED Lamp	78278
151	Computerised Universal Timer	41068
152	Number Guessing Game	36339
153	PC-Based Oscilloscope	235865
154	Intruder Radio Alert System	50270
155	Flashing Beacon	46880
156	Knock Alarm	62985
157	Automated Traffic Signal Controller	74288
158	Infrared Toy Car Motor Controller	193780
159	Mains Manager	36910
160	Crystal-Controlled Time-Base Generator	28676
161	Mains Operated Christmas Star	31317
162	Music On-Hold For Telephones	37810
163	Solidstate Switch For DC-Operated Gadgets	29939
164	Ding-Dong Bell	68180
165	IR Remote Switch	96797
166	Shortwave Transmitter	46792
167	FM Booster	95191
168	Laser Torch-Based Voice Transmitter And Receiver	75283
169	Mobile Phone Battery Charger	69225
170	Fastest Finger First Indicator	50839
171	Condenser Mic Audio Amplifier	64127
172	DarkRoom Timer	39885
173	Speller Effect Sign Display	32878
174	Stereo Tape Head Preamplifier For PC Sound Card	38945
175	A Hierarchical Priority Encoder	24954
176	Digital Mains Voltage Indicator	45458
177	Water-Level Controller	83510
178	Invisible Broken Wire Detector	72942
179	Anti-Theft Security For Car Audios	46133
180	Simple Telephone Ring Tone Generator	45161
181	Versatile Zener Diode Tester	37216
182	DTMF Proximity Detector	63629
183	Under-/Over-Voltage Beep for Manual Stabiliser	24971
184	15-Step Digital Power Supply	62563
185	Auto Shut-off For Cassette Players And Amplifiers	29345
186	House Security System	122242
187	Generation Of 1-Sec. Pulses Spaced 5-Sec. Apart	23116
188	9-Line Telephone Sharer	62871
189	Musical ‘Touch’ Bell	52831
190	Automatic Heat Detector	52697
191	Single Phase Electronic Starter	29938
192	Precision Amplifier With Digital Control	38713
193	Precision Attenuator With Digital Control	25091
194	Infrared Electronic Shooting Game	15262
195	Telephone Ringer Using Timer ICs	32181
196	Blown Fuse Indicator	30692
197	Automatic Speed-Controller For Fans and Coolers	48905
198	2-Line Intercom-Cum-Telephone Line Changeover Circuit	34496
199	Low-Cost PCO Billing Meter	37031
200	Telephone Line Based Audio Muting And Light-On Circuit	23643
201	Power-Supply Failure Alarm	44301
202	Add-On Stereo Channel Selector	24515
203	Parallel Telephones With Secrecy	31616
204	Telephone Number Display	63058
205	Luggage Security System	40969
206	Precision Digital AC Power Controller	32819
207	Phone BroadCaster	31355
208	Telephone Call Meter Using Calculator And COB	30603
209	Telephone Conversation Recorder	39610
210	Universal High-Resistance Voltmeter	23231
211	Protection For Your Electrical Appliances	30476
212	Simple Code Lock	52543
213	Time Switch	34372
214	Digital Speedometer	37555
215	Long-Range FM Transmitter	201662
216	Self-Switching Power Supply	30148
217	Electrical Equipment Control Using PC	77754
218	Teleremote Control	48549
219	Low-Cost Transistorised Intercom	34461
220	Charge Monitor For 12V Rechargeable Lead-Acid Battery	60392
221	Cordless Phone Backup	28736
222	Sleep-Switch Cum Wake-up Timer	24913
223	Simple Analogue To Digital Converter	33793
224	Dual-Channel Digital Volume Control	32809
225	Infrared Cordless Headphone	68093
226	Magnetic Proximity Switch	26817
227	Simple Low-Cost Digital Code Lock	40556
228	Ultra Low Drop Linear Regulator	14503
229	Simple Sensitive Remote Control Tester	16719
230	Electronic Scoring Game	21610
231	Tiny Dew Sensor	21889
232	Electronic Jam	48816
233	Precision 1Hz Clock Generator Using Chip-On-Board	17721
234	Digital Switching System	30323
235	40-Metre Direct Conversion Receiver	27397
236	Frequency Measurements Using PC	29843
237	Contactless AC Mains Voltage Detector	18379
238	PC-Based 7-Segment Rolling Display	28098
239	Electronic Card-Lock System	54660
240	Miniature Strobe Light	24874
241	Automatic Dual-Output Display	17362
242	CD-ROM Drive As Digital-Audio CD-Player	46371
243	Clap Remote	27554
244	Wiper Speed Controller	22274
245	Water Level Indicator With Alarm	43138
246	IC Controlled Emergency Light With Charger	45243
247	Auto Reset Over/Under Voltage Cut-Out	7557
248	Smart Phone Light	17601
249	Automatic Emergency Light	30540
250	Telecom Headset	16703
251	Automatic Room Power Control	23633
252	Handy Zener Diode Tester	12964
253	Telephone Line Vigilant	12609
254	High and Low Voltage Cutout With Delay and Melody	10689
255	Colour Sensor	30967
256	Running Message Display	26445
257	Low Current, High Voltage Power Supply	14208
258	Audio-Visual Extra Ringer For Phone	8371
259	Solidstate Auto Power-Off/On Mains Failure	5977
260	7MHz CW/AM QRP Transmitter	7926
261	Intelligent Switch	25564
262	Fluid Level Detector	17622
263	Programmable Door-Bell With Flashing LEDs	12970
264	Clap Switch	22605
265	Computerised Morse Code Generator/Transmitter	6468
266	Accurate Electronic Stop-Watch	11041
267	Magic Lights	27929
268	Digital Dice With Numeric Display	14256
269	Sensitive Temperature Switch	14700
270	Automatic Temperature Controlled Fan	21927
271	Watch-Dog for Telephones	13998
272	FM Transmitter For Channel Changer	23133
273	UPS For Cordless Telephones	25235
274	Touch-Sensitive Musical Bell With Timer	10776
275	Programmable LED Indicator	15913
276	Economical Pump Controller	14218
277	Fire Alarm	27060
278	Short Wave AM Transmitter	15268
279	Automatic Emergency Torch	15825
280	Ramp Controlled Light	10283
281	Simple Intercom Circuit	19756
282	Tank Overflow Preventer	17919
283	33-Volt Tunning Voltage	11648
284	Appliance Timer	12713
285	Electronic Code Lock	25858
286	Flashing Brakelight	12734
287	IR Remote Control	29424
288	Car Anti-Theft Wireless Alarm	23933
289	Divide-By-N Counter Realisation Using ICs CD4033 And CD4017	14097
290	Soft Musical Telephone Ringer	9405
291	Low Cost Transistorised Inverter	22905
292	Automatic Telephone Answering Machine	19601
293	Hourly Chime Function Generator	10303
294	Programmable Priority Time Switch	11716
295	Digital Volume Control	24056
296	Extension Phone Switcher	9385
297	Battery Opeated High Voltage Source	15730
298	Handy Telephone Receiver	15142
299	A Highly Efficient DC Lamp Dimmer	11983
300	Low Cost Automatic Gate LIght With A Musical Bell	13991