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Latest Issues

September 2010

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C I R C U I T L A B

1) Motion Sensor for Security Light (New)
2) Electric Guitar Preamplifier (New)

Click to view in order of 'highest hits first'

S No.	Circuit Name	Hits
1	High-Intensity, Energy-efficient LED Light	2081
2	Bipolar Transistor Tester	1096
3	Digital Thermometer	6452
4	Mobile Electronic Workbench	6359
5	Weekly Reminder	6873
6	Electronic Dice Using AT89C2051	4929
7	Digital Timer Enhancement	7193
8	Water-Level Indicator Using 7-segment display	12391
9	Automatic Light Controller Using 7806	15428
10	Spy Ear	15605
11	Antisleep Alarm for Students	23779
12	Four-Stage FM Transmitter	12549
13	Numeric Water-level Indicator	17145
14	Versatile Probe	7125
15	Electronic Candles	29057
16	Simple Sensitive Remote Control Tester	4137
17	Pyroelectric Fire Alarm	13059
18	Telephone Call Recorder	22040
19	DuoPhone	18474
20	Mini UPS System	39106
21	Car-Reversing Horn With Flasher	14904
22	Short-Circuit Protection in DC Low-Voltage Systems	13727
23	Inverter for Soldering Iron	21476
24	Transistorised Logic Probe for TTL	8531
25	Constant-Current Battery Charger	21793
26	Multitone Siren	16264
27	Generator Room Light	22659
28	Liquid Level Alarm	28671
29	PC Power Manager	18930
30	Skin Response Meter	28853
31	Solar Panel based Charger and Small LED Lamp	37844
32	Electronic Bicycle Lock	32115
33	Remote-operated Master Switch	29217
34	USB Power Socket	28704
35	Triple Power Supply	25172
36	Smart Hearing Aid	18602
37	Midnight Security Light	34514
38	Automated Alarm Circuits	25391
39	Traffic Baton	23329
40	Laser-guided Door Opener	37861
41	PC Temperature Controller	29093
42	Battery-level Indicator	37240
43	Traffic Controller	33824
44	Night Alert	32245
45	Muscular Stimulator	23496
46	Wireless Switch	73129
47	Electric Window Fence Charger	11398
48	Three-Phase Appliance Protector	21329
49	Aquarium Probe	23960
50	Bicycle Indicator	25807
51	Poor Man’s Hearing Aid	18616
52	Portable Lamp Flasher	20705
53	Car Anti-theft Guard	33288
54	USB Power Booster	35891
55	Smart Vibration Sensor	29897
56	Drinking Water alarm	45131
57	Glow Plug Controller	17997
58	Tester For Remote Control	27561
59	Automatic Low-Power Emergency Light	39634
60	Mobile Bug	64259
61	LED Lighting for Christmas	43225
62	Current Sensor	39529
63	Seismic Sensor	33164
64	Dice With 7-Segment Display	29596
65	Motorbike Alarm	37022
66	Laptop Protector	65089
67	Shutter Guard	20091
68	Desktop Power Supply	32418
69	Mobile Shield	45242
70	Infrared Firecracker Igniter	32262
71	Automatic Phase Changer	33283
72	Flying Saucer	46986
73	Anti-Collision Rear Light	30715
74	Light Fence	33019
75	MAT Switch	29619
76	5-Band Graphic Equaliser	28931
77	Clock Timer	43532
78	Fully Automatic Emergency Light	55860
79	IR Music Transmitter and Receiver	60776
80	Electronic Horn	39522
81	Darkroom Timer	2107
82	Water level indicator With Alarm	3789
83	PC Multimedia Speakers	4235
84	Precision Amplifier with Digital Control	1643
85	Security System Switcher	2631
86	Electronic Card-Lock System	3633
87	Blown Fuse Indicator	2008
88	Simple Intercom Circuit	2777
89	LED-Based Message Display	4371
90	Telephone Receiver	2607
91	Water-LeveL Controller	3686
92	Song Number Display	2416
93	Fastest-finger-first-indicator	2576
94	Musical 'Touch' Bell	3203
95	Audio-Visual Extra Ringer For Phone	1276
96	Contactless AC Mains Voltage Detector	2064
97	Fire Alarm	3922
98	Precison 1Hz Clock Generator Using Chip-On-Board	1266
99	Short Wave AM Transmitter	2110
100	Solidstate Auto Power off on Mains Failure	1425
101	Automatic Emergency Tourch	3105
102	Automatic Emergency Light	3836
103	Versatile CMOS TTL Logic and Clock Probe	1177
104	Programmable LED Indicator	2747
105	Touch Sensitive Musical Bell With Timer	1941
106	Staircase Light With Auto Switch-Off	2661
107	2-Line Intercom-Cum-Telephone Line Changeover Circuit	1363
108	Magic Light	4689
109	Teleremote Control	2078
110	Telephone Conversation Recorder	2148
111	Automatic Dual Output display	1180
112	Long Range IR Transmitter	2879
113	Digital Dice with numeric display	1139
114	Watch Dog for Telephones	1534
115	UPS for Cordless Telephones	1396
116	Economical Pump Controller	1506
117	Digital Speedometer	4824
118	House Security System	5981
119	Clap Switch	820
120	Tiny Dew Sensor	1841
121	Computerised Morse Code Generator Transmitter	1273
122	Telecom Headset	1377
123	Telephone Ringer Using Timer ICs	1161
124	Power Supply failure alarm	2022
125	Protection for your electrical Appliance	2100
126	Simple Code Lock	2926
127	PC-based 7 segment rolling display	1745
128	Automatic Room Power Control	2545
129	Fuild Level Detector	1606
130	Accurate Electronic Stop Watch	1057
131	Sensitive Temperature Switch	1357
132	Ramp Controlled Light	1103
133	7MHz CW AM QRP Transmitter	1478
134	Auto Reset Over-Under Voltage Cut-Out	1175
135	Shortwave transmitter	1393
136	Programmable Door-Bell with Flashing LEDS	1879
137	Precision Attenuater with Digital Control	844
138	Parallel telephone with Secrecy	1232
139	Telephone call meter using calculator and COB	1405
140	Magnetic Proximity switch	1469
141	Electronic Scoring game	1425
142	A Hierarchical Priority Encoder	919
143	Digital Mains Voltage indicator	1461
144	Low cost PCO Billing meter	1522
145	Automatic Speed Controller For Fans and Coolers	2996
146	Telephone line based Audio Muting	936
147	Precision Digial AC Power controller	1038
148	Phone BroadCaster	1395
149	Long-range FM Transmitter	2906
150	Self Switch power supply	1874
151	Electrical Equipment control using PC	2237
152	Low cost Transistorised intercom	1397
153	Cordless Phone Backup	1134
154	Sleep Switch cum wake timer	1545
155	Simple Analogue to digital converter	1558
156	Digital switching system	1764
157	Ultra Low Drop linear regulator	794
158	40-Meter Direct conversion receiver	1784
159	Frequency measurement using PC	1664
160	Miniature strobe light	1070
161	CD-Rom Drive as Digital-Audio CD Player	2352
162	Clap Remote	3291
163	Smart Phone Light	1379
164	Handy Zener Diode tester	1190
165	Telephone Line Vigilant	1205
166	High & Low Voltage cutout	1747
167	Color Sensor	3295
168	Running Message Display	2623
169	Low current high voltage power supply	1325
170	Intelligent Switch	2715
171	Automatic Temperature Controlled Fan	3690
172	Ultrasonic Proximity Detector	43021
173	Secret Bell	54919
174	Variable Power Supply Using a Fixed-Voltage Regulator IC	54083
175	Appliance Timer-Cum-Clap Switch	27423
176	Telephone-Operated Calling System	39428
177	Front Door Guard	43151
178	Bell-Cum Light Controller	26433
179	Friendly Charger for Mobile Phones	53418
180	Hearing Aid	35673
181	Speed Control of DC Motor Using Pulse-Width Modulation	49880
182	Remote-Controlled Fan Regulator	81716
183	Low-Power Voltage Doubler	29982
184	Parrot-Sounding AC Doorbell	28966
185	Multi-Melody Generator With Instrumental Effect	21930
186	School-College Quiz Buzzer	23733
187	Visual AC Mains Voltage Indicator	27178
188	Simple Short-Wave Transmitter	27762
189	Solar Lighting System	84527
190	Infrared Bug	44228
191	Picnic Lamp	38147
192	Versatile Power Supply	35625
193	Ultrasonic Proximity Detector	43623
194	Shadow Alarm	53321
195	IR Burglar Deterrent	62243
196	Versatile Water-Level Controller	48924
197	Automatic-Off Timer For CD Players	31833
198	Heat-Sensitive Switch	36770
199	Sensitive Vibration Detector	34939
200	Digital Dice	39595
201	Remote-Controlled Power-Off Switch	62983
202	Little Door Guard	43662
203	Stress Meter	48440
204	Medium-Power FM Transmitter	51526
205	Teleconferencing System	49018
206	Smart Cellphone Holder	42884
207	Fuel Reserve Indicator For Vehicles	39703
208	Brake Failure Indicator	46729
209	Safety Guard	33855
210	Mains Supply Failure Alarm	35017
211	Remote Control For Home Appliances	112043
212	Micromotor Controller	48265
213	Solar Bug	54391
214	Simple Digital Security System	57453
215	Digital Audio - Video Input Selector	1405
216	Auto Turn-Off Battery Charger	63766
217	Atmel AVR ISP Dongle	44405
218	Audio Amplifier for Personal Stereo	56017
219	Musical Light Chaser	49437
220	Hit Switch	82787
221	Water-Level Controller	53255
222	Fire Alarm Using Thermistor	50995
223	Electronic Watchdog	71887
224	Automatic School Bell	46169
225	Anti-Theft Alarm For Bikes	66453
226	DC Motor Control Using A Single Switch	51381
227	Solidstate Remote Control Switch	43807
228	Flashing-Cum-Running Light	40638
229	Quality FM Transmitter	91029
230	Stabilised Power Supply With Short-Circuit Indication	39347
231	Digital Stop Watch	56786
232	Cell-Phone-Controlled Audio Video Mute Switch	50273
233	PC-Based DC Motor Speed Controller	68105
234	Under-Over-Voltage Beep for Manual Stabiliser	26570
235	Child's Lamp	55945
236	Watchman Watcher	50590
237	Highway Alert Signal Lamp	37641
238	Low-Cost Electronic Quiz Table	35165
239	Mobile Cellphone Charger	94324
240	Smart Foot Switch	43385
241	Programmable Timer for Appliances	61198
242	Anti-Bag-Snatching Alarm	36142
243	Multiband CW Transmitter	36705
244	Automatic Night Lamp With Morning Alarm	71197
245	Touch Dimmer	68511
246	Mosfet-Based Preamplifier for FM Radio DXing	45430
247	Non-Contact Power Monitor	33117
248	Remote-Operated Musical Bell	52502
249	Electronic Motor Starter	62479
250	Washing Machine Motor Controller	56104
251	Over-Under-Voltage Protection of Electrical Appliances	39570
252	Low-Cost Hearing Aid	50576
253	Voltage-Based Controller For Switches	30338
254	DTMF Receiver IC MT8870 Tester	64780
255	Pulse Generator	55635
256	Infrared Remote Control Timer	60511
257	Multi-Switch Doorbell With Indicators	34615
258	Electronic Security System	169045
259	Lead-Acid Battery Charger With Voltage Analyser	70492
260	Ultra-Bright LED Lamp	100455
261	Three-Colour Display Using Bicolour LEDs	58633
262	Computerised Universal Timer	47135
263	Number Guessing Game	44045
264	Intruder Radio Alert System	56971
265	Flashing Beacon	55045
266	Knock Alarm	73686
267	Automated Traffic Signal Controller	87079
268	Infrared Toy Car Motor Controller	224938
269	Mains Manager	42406
270	Crystal-Controlled Time-Base Generator	32905
271	Mains Operated Christmas Star	36037
272	Music On-Hold For Telephones	42076
273	Solidstate Switch For DC-Operated Gadgets	35039
274	Ding-Dong Bell	81596
275	IR Remote Switch	118574
276	FM Booster	113021
277	Laser Torch-Based Voice Transmitter And Receiver	88221
278	Mobile Phone Battery Charger	88518
279	Condenser Mic Audio Amplifier	74600
280	Speller Effect Sign Display	38355
281	Stereo Tape Head Preamplifier For PC Sound Card	44315
282	Invisible Broken Wire Detector	89315
283	Anti-Theft Security For Car Audios	53732
284	Simple Telephone Ring Tone Generator	51485
285	DTMF Proximity Detector	71986
286	Versatile Zener Diode Tester	43138
287	15-Step Digital Power Supply	73286
288	Auto Shut-off For Cassette Players And Amplifiers	33599
289	Generation Of 1-Sec. Pulses Spaced 5-Sec. Apart	27493
290	9-Line Telephone Sharer	71276
291	Automatic Heat Detector	65017
292	Single Phase Electronic Starter	36959
293	Infrared Electronic Shooting Game	22070
294	Add-On Stereo Channel Selector	28621
295	Telephone Number Display	76138
296	Luggage Security System	51041
297	Universal High-Resistance Voltmeter	28598
298	Time Switch	44995
299	Charge Monitor For 12V Rechargeable Lead-Acid Battery	75539
300	Dual-Channel Digital Volume Control	39701