Circuit lab, diagrams,Free circuits, Electronics periodical, e-mags: India

.	S E C T I O N S

Circuits On Sale

EFY MagOnline

Registered Users

New User?

Forgot Password?

Benefits for registered users
1.	Free access to latest circuits in Circuit Lab
2.	Free submission of your website(s)
3.	Free submission of events
4.	Can submit queries in Bulletin Board
5.	Can submit articles or weblinks in Technical Articles

Latest Issues

July 2008

Tell me more

Subscribe print version

Renew print version

Subscribe digital version

C I R C U I T L A B

1) Aquarium Probe (New)
2) Bicycle Indicator (New)

Click to view in order of 'highest hits first'

S No.	Circuit Name	Hits
1	Poor Man’s Hearing Aid	1127
2	Portable Lamp Flasher	1804
3	Staircase Light With Auto Switch-Off	3602
4	Car Anti-theft Guard	2777
5	USB Power Booster	5264
6	Smart Vibration Sensor	4244
7	Drinking Water alarm	7025
8	GLOW PLuG CONTROLLER	3394
9	Versatile CMOS TTL Logic And Clock Probe	2412
10	Tester For Remote Control	6028
11	Automatic Low-Power Emergency Light	10751
12	Mobile Bug	12324
13	LED Lighting for Christmas	9552
14	Current Sensor	10037
15	Seismic Sensor	8771
16	Dice With 7-Segment Display	6847
17	Motorbike Alarm	11484
18	Laptop Protector	15348
19	Shutter Guard	6833
20	Desktop Power Supply	10907
21	Mobile Shield	15733
22	Infrared Firecracker Igniter	11440
23	Automatic Phase Changer	12129
24	Flying Saucer	15331
25	Anti-Collision Rear Light	12533
26	Light Fence	13119
27	MAT Switch	11002
28	5-Band Graphic Equaliser	10700
29	Clock Timer	18360
30	Fully Automatic Emergency Light	23027
31	IR Music Transmitter and Receiver	27121
32	Electronic Horn	16473
33	Ultrasonic Proximity Detector	19725
34	Secret Bell	23199
35	Variable Power Supply Using a Fixed-Voltage Regulator IC	27153
36	Appliance Timer-Cum-Clap Switch	13774
37	Telephone-Operated Calling System	19613
38	Front Door Guard	20702
39	Bell-Cum Light Controller	13634
40	Friendly Charger for Mobile Phones	22916
41	Hearing Aid	17912
42	Speed Control of DC Motor Using Pulse-Width Modulation	23668
43	Remote-Controlled Fan Regulator	39176
44	Low-Power Voltage Doubler	14963
45	Parrot-Sounding AC Doorbell	14947
46	Multi-Melody Generator With Instrumental Effect	11475
47	School/College Quiz Buzzer	13746
48	Visual AC Mains Voltage Indicator	14452
49	Simple Short-Wave Transmitter	15631
50	Solar Lighting System	40441
51	Infrared Bug	25541
52	Picnic Lamp	21096
53	Versatile Power Supply	22380
54	Ultrasonic Proximity Detector	27312
55	Shadow Alarm	29950
56	IR Burglar Deterrent	32618
57	Versatile Water-Level Controller	26995
58	Automatic-Off Timer For CD Players	19080
59	Heat-Sensitive Switch	21323
60	Sensitive Vibration Detector	21129
61	Digital Dice	23175
62	Remote-Controlled Power-Off Switch	38022
63	Little Door Guard	27495
64	Stress Meter	25868
65	Teleconferencing System	30081
66	Medium-Power FM Transmitter	33257
67	Smart Cellphone Holder	27084
68	Fuel Reserve Indicator For Vehicles	24707
69	Brake Failure Indicator	27058
70	Safety Guard	20610
71	Mains Supply Failure Alarm	21882
72	Remote Control For Home Appliances	62136
73	Micromotor Controller	30800
74	Solar Bug	32799
75	Simple Digital Security System	36992
76	Digital Audio/Video Input Selector	20606
77	Auto Turn-Off Battery Charger	38484
78	Atmel AVR ISP Dongle	27482
79	Audio Amplifier for Personal Stereo	38018
80	Musical Light Chaser	32121
81	Water-Level Controller	53834
82	Hit Switch	34044
83	Fire Alarm Using Thermistor	32814
84	Electronic Watchdog	45015
85	Automatic School Bell	29314
86	Anti-Theft Alarm For Bikes	42735
87	DC Motor Control Using A Single Switch	34073
88	Solidstate Remote Control Switch	31770
89	Flashing-Cum-Running Light	28369
90	Quality FM Transmitter	63785
91	Stabilised Power Supply With Short-Circuit Indication	28202
92	Digital Stop Watch	38871
93	Cell-Phone-Controlled Audio/Video Mute Switch	44487
94	PC-Based DC Motor Speed Controller	48949
95	Child's Lamp	37314
96	Watchman Watcher	33262
97	Highway Alert Signal Lamp	25906
98	Low-Cost Electronic Quiz Table	23814
99	Mobile Cellphone Charger	57587
100	Smart Foot Switch	29611
101	Programmable Timer for Appliances	46007
102	Anti-Bag-Snatching Alarm	25435
103	LED-Based Message Display	67994
104	Multiband CW Transmitter	27910
105	Automatic Night Lamp With Morning Alarm	51323
106	Touch Dimmer	46799
107	Mosfet-Based Preamplifier for FM Radio DXing	33272
108	Non-Contact Power Monitor	24839
109	Remote-Operated Musical Bell	41131
110	Electronic Motor Starter	44458
111	Telephone Receiver	63569
112	Washing Machine Motor Controller	41399
113	Low-Cost Hearing Aid	37901
114	Over-/Under-Voltage Protection of Electrical Appliances	33249
115	Parallel Telephone With Secrecy and Call Prevention	38730
116	Voltage-Based Controller For Switches	22564
117	DTMF Receiver IC MT8870 Tester	51127
118	Pulse Generator	40391
119	Infrared Remote Control Timer	47395
120	Clap Switch	77124
121	Multi-Switch Doorbell With Indicators	26718
122	Song Number Display	36106
123	Lead-Acid Battery Charger With Voltage Analyser	53299
124	Electronic Security System	100667
125	Three-Colour Display Using Bicolour LEDs	44086
126	Ultra-Bright LED Lamp	65405
127	Computerised Universal Timer	36544
128	Number Guessing Game	31591
129	PC-Based Oscilloscope	209938
130	Intruder Radio Alert System	45313
131	Flashing Beacon	41037
132	Knock Alarm	56011
133	Automated Traffic Signal Controller	64943
134	Infrared Toy Car Motor Controller	174239
135	Mains Manager	32773
136	Crystal-Controlled Time-Base Generator	25587
137	Mains Operated Christmas Star	27859
138	Music On-Hold For Telephones	34636
139	Solidstate Switch For DC-Operated Gadgets	26226
140	Ding-Dong Bell	59333
141	IR Remote Switch	85148
142	Shortwave Transmitter	41308
143	FM Booster	85261
144	Laser Torch-Based Voice Transmitter And Receiver	67192
145	Mobile Phone Battery Charger	57671
146	Fastest Finger First Indicator	43317
147	Condenser Mic Audio Amplifier	56784
148	DarkRoom Timer	34533
149	Speller Effect Sign Display	29013
150	Stereo Tape Head Preamplifier For PC Sound Card	34646
151	A Hierarchical Priority Encoder	21747
152	Digital Mains Voltage Indicator	39224
153	Water-Level Controller	70165
154	Invisible Broken Wire Detector	63087
155	Anti-Theft Security For Car Audios	41094
156	Simple Telephone Ring Tone Generator	40569
157	Versatile Zener Diode Tester	32711
158	DTMF Proximity Detector	57583
159	Under-/Over-Voltage Beep for Manual Stabiliser	24348
160	15-Step Digital Power Supply	55623
161	Auto Shut-off For Cassette Players And Amplifiers	26163
162	House Security System	97855
163	Generation Of 1-Sec. Pulses Spaced 5-Sec. Apart	20015
164	9-Line Telephone Sharer	56946
165	Musical ‘Touch’ Bell	49053
166	Automatic Heat Detector	45699
167	Single Phase Electronic Starter	25246
168	Precision Amplifier With Digital Control	34668
169	Precision Attenuator With Digital Control	21596
170	Infrared Electronic Shooting Game	10562
171	Telephone Ringer Using Timer ICs	28323
172	Blown Fuse Indicator	25815
173	Automatic Speed-Controller For Fans and Coolers	41181
174	2-Line Intercom-Cum-Telephone Line Changeover Circuit	30509
175	Low-Cost PCO Billing Meter	32344
176	Telephone Line Based Audio Muting And Light-On Circuit	20394
177	Power-Supply Failure Alarm	37998
178	Add-On Stereo Channel Selector	21522
179	Parallel Telephones With Secrecy	27897
180	Telephone Number Display	55294
181	Luggage Security System	35133
182	Precision Digital AC Power Controller	28461
183	Phone BroadCaster	27161
184	Telephone Call Meter Using Calculator And COB	26240
185	Telephone Conversation Recorder	33860
186	Universal High-Resistance Voltmeter	19495
187	Protection For Your Electrical Appliances	24927
188	Simple Code Lock	43011
189	Time Switch	28023
190	Digital Speedometer	25224
191	Long-Range FM Transmitter	175124
192	Self-Switching Power Supply	25388
193	Electrical Equipment Control Using PC	69038
194	Teleremote Control	41857
195	Low-Cost Transistorised Intercom	29310
196	Charge Monitor For 12V Rechargeable Lead-Acid Battery	50187
197	Cordless Phone Backup	24954
198	Sleep-Switch Cum Wake-up Timer	20341
199	Simple Analogue To Digital Converter	28408
200	Dual-Channel Digital Volume Control	28091
201	Infrared Cordless Headphone	59669
202	Magnetic Proximity Switch	22049
203	Simple Low-Cost Digital Code Lock	34717
204	Ultra Low Drop Linear Regulator	11778
205	Simple Sensitive Remote Control Tester	13441
206	Electronic Scoring Game	16849
207	Tiny Dew Sensor	17622
208	Electronic Jam	39552
209	Precision 1Hz Clock Generator Using Chip-On-Board	13704
210	Digital Switching System	24123
211	40-Metre Direct Conversion Receiver	22139
212	Frequency Measurements Using PC	24566
213	Contactless AC Mains Voltage Detector	14191
214	PC-Based 7-Segment Rolling Display	22409
215	Electronic Card-Lock System	45405
216	Miniature Strobe Light	19901
217	Automatic Dual-Output Display	13727
218	CD-ROM Drive As Digital-Audio CD-Player	37374
219	Clap Remote	21183
220	Wiper Speed Controller	17566
221	Water Level Indicator With Alarm	32591
222	IC Controlled Emergency Light With Charger	36544
223	Auto Reset Over/Under Voltage Cut-Out	7249
224	Smart Phone Light	13228
225	Automatic Emergency Light	20773
226	Telecom Headset	12679
227	Automatic Room Power Control	16671
228	Handy Zener Diode Tester	9092
229	Telephone Line Vigilant	9403
230	High and Low Voltage Cutout With Delay and Melody	7521
231	Colour Sensor	21458
232	Running Message Display	18595
233	Low Current, High Voltage Power Supply	10088
234	Audio-Visual Extra Ringer For Phone	5825
235	Solidstate Auto Power-Off/On Mains Failure	5667
236	7MHz CW/AM QRP Transmitter	7613
237	Intelligent Switch	16625
238	Fluid Level Detector	12104
239	Programmable Door-Bell With Flashing LEDs	8933
240	Clap Switch	13226
241	Computerised Morse Code Generator/Transmitter	6162
242	Accurate Electronic Stop-Watch	7373
243	Magic Lights	18352
244	Digital Dice With Numeric Display	9520
245	Sensitive Temperature Switch	9964
246	Automatic Temperature Controlled Fan	14581
247	Watch-Dog for Telephones	9429
248	FM Transmitter For Channel Changer	16218
249	UPS For Cordless Telephones	16990
250	Touch-Sensitive Musical Bell With Timer	6980
251	Programmable LED Indicator	10658
252	Economical Pump Controller	9112
253	Fire Alarm	16571
254	Short Wave AM Transmitter	10710
255	Automatic Emergency Torch	10079
256	Ramp Controlled Light	6741
257	Simple Intercom Circuit	13197
258	Tank Overflow Preventer	11041
259	33-Volt Tunning Voltage	7705
260	Appliance Timer	8640
261	Electronic Code Lock	16461
262	Flashing Brakelight	8222
263	IR Remote Control	20011
264	Car Anti-Theft Wireless Alarm	16575
265	Divide-By-N Counter Realisation Using ICs CD4033 And CD4017	9121
266	Soft Musical Telephone Ringer	6154
267	Low Cost Transistorised Inverter	14228
268	Automatic Telephone Answering Machine	12947
269	Hourly Chime Function Generator	6612
270	Programmable Priority Time Switch	7882
271	Digital Volume Control	15687
272	Extension Phone Switcher	6322
273	Battery Opeated High Voltage Source	10249
274	Handy Telephone Receiver	10089
275	A Highly Efficient DC Lamp Dimmer	8061
276	Low Cost Automatic Gate LIght With A Musical Bell	8930
277	Automatic Switch For Audio Power Amplifier	9033
278	Capacitance Bridge	9294
279	Darkness Controlled Light Switch	13818
280	AF/RF Signal Tracer	11015
281	Automatic Temperature Controller	13913
282	Simple Logic Probe	7286
283	Telephone Amplifier	8610
284	Ready -To-Use Object Counter	8731
285	Four-In-One Burglar Alarm	9914
286	Telephone Call Counter	10964
287	Water Level Controller Using 3-Phase Starter	9833
288	Running Lights Effect	10931
289	Programmable Musical Bell	6742
290	Solidstate Relay with Under/Over Voltage Protection	6086
291	Adjustable Dancing Lights	6731
292	Ultrasonic Switch	9970
293	Off-Line Telephone Tester	5215
294	Dancing Lights	10847
295	Versatile Variable Duration Digital Timer	3755
296	Programmable 8-Digit Code Lock	7370
297	Add Auto Start To Generators	4327
298	Sound Controlled Flip-Flop	4709
299	Tacho for Microprocessor Based Drives	4625
300	Low Cost Electronic Clock	8534