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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 'latest circuits first'

S No.	Circuit Name	Hits
1	Infrared Toy Car Motor Controller	224938
2	Electronic Security System	169044
3	IR Remote Switch	118574
4	FM Booster	113020
5	Remote Control For Home Appliances	112040
6	Ultra-Bright LED Lamp	100455
7	Mobile Cellphone Charger	94324
8	Quality FM Transmitter	91026
9	Invisible Broken Wire Detector	89315
10	Mobile Phone Battery Charger	88517
11	Laser Torch-Based Voice Transmitter And Receiver	88220
12	Automated Traffic Signal Controller	87078
13	Solar Lighting System	84525
14	Hit Switch	82786
15	Infrared Cordless Headphone	82428
16	Remote-Controlled Fan Regulator	81714
17	Ding-Dong Bell	81596
18	Telephone Number Display	76138
19	Charge Monitor For 12V Rechargeable Lead-Acid Battery	75537
20	Condenser Mic Audio Amplifier	74600
21	Knock Alarm	73685
22	15-Step Digital Power Supply	73286
23	Wireless Switch	73129
24	DTMF Proximity Detector	71985
25	Electronic Watchdog	71887
26	9-Line Telephone Sharer	71276
27	Automatic Night Lamp With Morning Alarm	71195
28	Lead-Acid Battery Charger With Voltage Analyser	70491
29	Touch Dimmer	68509
30	PC-Based DC Motor Speed Controller	68103
31	Anti-Theft Alarm For Bikes	66451
32	Electronic Jam	65354
33	Laptop Protector	65088
34	Automatic Heat Detector	65016
35	DTMF Receiver IC MT8870 Tester	64780
36	Mobile Bug	64255
37	Auto Turn-Off Battery Charger	63765
38	Remote-Controlled Power-Off Switch	62981
39	Electronic Motor Starter	62478
40	IR Burglar Deterrent	62242
41	Programmable Timer for Appliances	61197
42	IR Music Transmitter and Receiver	60774
43	Infrared Remote Control Timer	60511
44	IC Controlled Emergency Light With Charger	59356
45	Three-Colour Display Using Bicolour LEDs	58633
46	Simple Digital Security System	57452
47	Intruder Radio Alert System	56970
48	Digital Stop Watch	56786
49	Washing Machine Motor Controller	56103
50	Audio Amplifier for Personal Stereo	56017
51	Child's Lamp	55944
52	Fully Automatic Emergency Light	55858
53	Pulse Generator	55635
54	Flashing Beacon	55044
55	Secret Bell	54918
56	Solar Bug	54391
57	Variable Power Supply Using a Fixed-Voltage Regulator IC	54081
58	Anti-Theft Security For Car Audios	53732
59	Friendly Charger for Mobile Phones	53416
60	Shadow Alarm	53320
61	Water-Level Controller	53255
62	Remote-Operated Musical Bell	52501
63	Medium-Power FM Transmitter	51524
64	Simple Telephone Ring Tone Generator	51485
65	DC Motor Control Using A Single Switch	51379
66	Simple Low-Cost Digital Code Lock	51111
67	Luggage Security System	51040
68	Fire Alarm Using Thermistor	50995
69	Watchman Watcher	50589
70	Low-Cost Hearing Aid	50575
71	Cell-Phone-Controlled Audio Video Mute Switch	50273
72	Speed Control of DC Motor Using Pulse-Width Modulation	49878
73	Musical Light Chaser	49437
74	Teleconferencing System	49017
75	Versatile Water-Level Controller	48922
76	Stress Meter	48439
77	Micromotor Controller	48265
78	Computerised Universal Timer	47135
79	Flying Saucer	46984
80	Brake Failure Indicator	46729
81	Automatic School Bell	46169
82	Colour Sensor	45694
83	Mosfet-Based Preamplifier for FM Radio DXing	45428
84	Mobile Shield	45240
85	Drinking Water alarm	45130
86	Time Switch	44995
87	Atmel AVR ISP Dongle	44405
88	Stereo Tape Head Preamplifier For PC Sound Card	44315
89	Infrared Bug	44227
90	Number Guessing Game	44045
91	Solidstate Remote Control Switch	43807
92	Little Door Guard	43660
93	Ultrasonic Proximity Detector	43622
94	Clock Timer	43529
95	Smart Foot Switch	43385
96	LED Lighting for Christmas	43224
97	Front Door Guard	43149
98	Versatile Zener Diode Tester	43138
99	Ultrasonic Proximity Detector	43020
100	Smart Cellphone Holder	42883
101	Mains Manager	42406
102	Music On-Hold For Telephones	42076
103	Flashing-Cum-Running Light	40638
104	IR Remote Control	39893
105	Fuel Reserve Indicator For Vehicles	39703
106	Dual-Channel Digital Volume Control	39701
107	Automatic Low-Power Emergency Light	39631
108	Digital Dice	39594
109	Over-Under-Voltage Protection of Electrical Appliances	39570
110	Current Sensor	39527
111	Electronic Horn	39519
112	Telephone-Operated Calling System	39427
113	Stabilised Power Supply With Short-Circuit Indication	39347
114	Mini UPS System	39103
115	Electronic Code Lock	38891
116	Speller Effect Sign Display	38355
117	Picnic Lamp	38145
118	Laser-guided Door Opener	37861
119	Solar Panel based Charger and Small LED Lamp	37844
120	Highway Alert Signal Lamp	37640
121	Battery-level Indicator	37239
122	Motorbike Alarm	37021
123	Single Phase Electronic Starter	36958
124	Heat-Sensitive Switch	36768
125	Multiband CW Transmitter	36703
126	Anti-Bag-Snatching Alarm	36141
127	Mains Operated Christmas Star	36037
128	USB Power Booster	35890
129	Hearing Aid	35672
130	Versatile Power Supply	35624
131	Low-Cost Electronic Quiz Table	35165
132	Solidstate Switch For DC-Operated Gadgets	35039
133	Mains Supply Failure Alarm	35017
134	Sensitive Vibration Detector	34938
135	Multi-Switch Doorbell With Indicators	34615
136	Midnight Security Light	34514
137	Safety Guard	33855
138	Traffic Controller	33824
139	Auto Shut-off For Cassette Players And Amplifiers	33599
140	FM Transmitter For Channel Changer	33396
141	Car Anti-theft Guard	33286
142	Automatic Phase Changer	33282
143	Car Anti-Theft Wireless Alarm	33243
144	Seismic Sensor	33163
145	Non-Contact Power Monitor	33116
146	Light Fence	33016
147	Crystal-Controlled Time-Base Generator	32905
148	Desktop Power Supply	32417
149	Infrared Firecracker Igniter	32260
150	Night Alert	32245
151	Electronic Bicycle Lock	32114
152	Automatic-Off Timer For CD Players	31831
153	Tank Overflow Preventer	31027
154	Anti-Collision Rear Light	30713
155	Low Cost Transistorised Inverter	30632
156	Voltage-Based Controller For Switches	30338
157	Low-Power Voltage Doubler	29980
158	Smart Vibration Sensor	29895
159	MAT Switch	29617
160	Dice With 7-Segment Display	29593
161	Wiper Speed Controller	29592
162	Remote-operated Master Switch	29217
163	Digital Volume Control	29166
164	PC Temperature Controller	29093
165	Electronic Candles	29055
166	Parrot-Sounding AC Doorbell	28964
167	5-Band Graphic Equaliser	28929
168	Skin Response Meter	28853
169	USB Power Socket	28703
170	Liquid Level Alarm	28671
171	Add-On Stereo Channel Selector	28621
172	Universal High-Resistance Voltmeter	28598
173	Simple Short-Wave Transmitter	27760
174	Tester For Remote Control	27560
175	Generation Of 1-Sec. Pulses Spaced 5-Sec. Apart	27493
176	Appliance Timer-Cum-Clap Switch	27422
177	Visual AC Mains Voltage Indicator	27177
178	Under-Over-Voltage Beep for Manual Stabiliser	26570
179	Bell-Cum Light Controller	26432
180	Automatic Telephone Answering Machine	25991
181	Bicycle Indicator	25807
182	Automated Alarm Circuits	25391
183	Triple Power Supply	25172
184	Aquarium Probe	23959
185	Darkness Controlled Light Switch	23906
186	Automatic Temperature Controller	23904
187	Antisleep Alarm for Students	23777
188	School-College Quiz Buzzer	23732
189	Muscular Stimulator	23496
190	Traffic Baton	23329
191	Generator Room Light	22656
192	Infrared Electronic Shooting Game	22070
193	Telephone Call Recorder	22040
194	Multi-Melody Generator With Instrumental Effect	21929
195	Constant-Current Battery Charger	21792
196	Inverter for Soldering Iron	21475
197	Three-Phase Appliance Protector	21327
198	Portable Lamp Flasher	20704
199	Shutter Guard	20090
200	Flashing Brakelight	19328
201	PC Power Manager	18930
202	Appliance Timer	18794
203	Poor Man’s Hearing Aid	18616
204	Smart Hearing Aid	18602
205	Divide-By-N Counter Realisation Using ICs CD4033 And CD4017	18583
206	DuoPhone	18474
207	Battery Opeated High Voltage Source	18471
208	Handy Telephone Receiver	18166
209	Telephone Call Counter	18057
210	Glow Plug Controller	17995
211	Running Lights Effect	17781
212	Dancing Lights	17155
213	Numeric Water-level Indicator	17143
214	Four-In-One Burglar Alarm	17075
215	Ready -To-Use Object Counter	16852
216	33-Volt Tunning Voltage	16799
217	Low Cost Automatic Gate LIght With A Musical Bell	16731
218	Capacitance Bridge	16672
219	Multitone Siren	16263
220	Water Level Controller Using 3-Phase Starter	15776
221	Spy Ear	15604
222	Automatic Switch For Audio Power Amplifier	15523
223	Automatic Light Controller Using 7806	15428
224	Ultrasonic Switch	15313
225	Car-Reversing Horn With Flasher	14904
226	Programmable Priority Time Switch	14625
227	Telephone Amplifier	14404
228	Short-Circuit Protection in DC Low-Voltage Systems	13726
229	A Highly Efficient DC Lamp Dimmer	13317
230	Pyroelectric Fire Alarm	13059
231	Hourly Chime Function Generator	12772
232	Soft Musical Telephone Ringer	12728
233	Four-Stage FM Transmitter	12549
234	Water-Level Indicator Using 7-segment display	12391
235	Simple Logic Probe	12013
236	Extension Phone Switcher	11441
237	Electric Window Fence Charger	11397
238	Programmable 8-Digit Code Lock	11347
239	Low Cost Electronic Clock	11192
240	AF/RF Signal Tracer	11057
241	Programmable Musical Bell	10166
242	Adjustable Dancing Lights	10125
243	PC Based Digital Clock	9487
244	Powerful AM Radio Transmitter	8824
245	Transistorised Logic Probe for TTL	8530
246	Off-Line Telephone Tester	7631
247	Sound Controlled Flip-Flop	7397
248	Digital Timer Enhancement	7193
249	Versatile Probe	7125
250	Weekly Reminder	6873
251	A Low Distortion Audio Pre-amplifier	6871
252	Add Auto Start To Generators	6647
253	Digital Thermometer	6451
254	Mobile Electronic Workbench	6359
255	Solidstate Relay with Under/Over Voltage Protection	6292
256	House Security System	5980
257	Tacho for Microprocessor Based Drives	5818
258	Versatile Variable Duration Digital Timer	5221
259	Electronic Dice Using AT89C2051	4929
260	Digital Speedometer	4823
261	Magic Light	4688
262	Fancy Christmas Light	4647
263	LED-Based Message Display	4370
264	PC Multimedia Speakers	4233
265	Simple Sensitive Remote Control Tester	4136
266	Fire Alarm	3921
267	Automatic Emergency Light	3835
268	Water level indicator With Alarm	3787
269	Automatic Temperature Controlled Fan	3689
270	Water-LeveL Controller	3684
271	Electronic Card-Lock System	3632
272	Color Sensor	3295
273	Clap Remote	3291
274	Musical 'Touch' Bell	3202
275	Automatic Emergency Tourch	3103
276	Automatic Speed Controller For Fans and Coolers	2995
277	Simple Code Lock	2925
278	Long-range FM Transmitter	2905
279	Long Range IR Transmitter	2879
280	Simple Intercom Circuit	2776
281	Programmable LED Indicator	2746
282	Intelligent Switch	2715
283	Staircase Light With Auto Switch-Off	2660
284	Security System Switcher	2629
285	Running Message Display	2623
286	Telephone Receiver	2605
287	Fastest-finger-first-indicator	2575
288	Automatic Room Power Control	2545
289	Song Number Display	2414
290	CD-Rom Drive as Digital-Audio CD Player	2352
291	Electrical Equipment control using PC	2237
292	Telephone Conversation Recorder	2146
293	Short Wave AM Transmitter	2109
294	Darkroom Timer	2106
295	Protection for your electrical Appliance	2100
296	High-Intensity, Energy-efficient LED Light	2079
297	Teleremote Control	2076
298	Contactless AC Mains Voltage Detector	2062
299	Power Supply failure alarm	2022
300	Blown Fuse Indicator	2007