by
magvitron
Published on 15th January 2013 02:46 PM
Number of Views: 819
The driving theme behind the Automatic Street Lighting System is an energy-saving streetlight scheme, where the system would
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by
alec_t
Published on 6th August 2011 04:54 AM
Number of Views: 6706
I'm probably re-inventing the wheel, but here are a few variations of a mains-powered night-light for 230-250V, adaptable
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by
3lectrix
Published on 15th June 2011 11:59 PM
Number of Views: 7327
The circuit is based on National Semiconductors comparator LM311 (IC1) and an LDR. The non inverting input of IC1 is given with a reference voltage of 6V using resistors R3 and R4. The input to the inverting input will be the voltage across the LDR that is light dependent. At darkness the resistance of the LDR will be high and so do the voltage across it.
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by
3lectrix
Published on 15th June 2011 11:55 PM
Number of Views: 5849
The dark detector circuit shown here can be used to produce an audible alarm when the light inside a room goes OFF. The circuit is build around timer IC NE555.A general purpose LDR is used for sensing the light. When proper light is falling on the LDR its resistance is very low. When there is no light the LDR resistance increases. At this time the IC is triggered and drives the buzzer to produce an alarm sound. If a transistor and relay is connected at the output (pin3) of IC1 instead of the buzzer, electrical appliances can be switched according to the light.
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by
languer
Published on 26th November 2010 06:26 AM
Number of Views: 13439
Creating an infrared (IR) communications link can be very useful. Some examples of projects which may benefit from and infrared data link are wireless control, beam breaking detection, and many others. Building this communications data link using infrared technology can be quite simple. The circuits presented here are not all-encompassing, but should serve as a good starting point for further work.
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by
ben7
Published on 20th October 2010 11:00 PM
Number of Views: 13339
This circuit uses can be used as a night light. It uses a 120v Mains to power the circuit. Works like a charm!
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by
zachtheterrible
Published on 5th January 2010 06:18 AM
Number of Views: 11402
This is a cool little circuit that i made for a school project. It can be used as one of those things that is usually seen
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