A Simple Light activated switch

Description.
This is the circuit diagram of a light activated switch based on National Semiconductors comparator IC LM 311 and a LDR.

The circuit is based on a voltage comparator circuit wired around IC 1.The non inverting in put 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. At this condition the voltage ....etc

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To get full information or details of light sensitive switch please have a look on the pages

http://seminarsprojects.net/Thread-light-sensitive-alarm?pid=26008&mode=threaded

if you again feel trouble on light sensitive switch please reply in that page and ask specific fields in light sensitive switch ....etc

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This temperature switch project will provide you with an understanding of the use of germanium diode and how it works compared to the more common silicon diode. It works on the principle that as the temperature surrounding the germanium diode increases, the back resistance decreases sharply.



At room temperature, the germanium diode D1 has a typical back resistance of 10K ohm. At this value, the base of transistor Q1 is turned ON, causing transistor Q2 to turn ON as well. When this happens, the base of transistor Q3 is kept to ground cau ....etc

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sir,
i have made the project but my ckt is not tripping , will changing the rating of potentio meter will do any work. ....etc

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I study in 12th Sci. So I want Project report for Vegakit light sensitive switch ....etc

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ADVANTAGES OF TOUCH SENSITIVE SIREN AND DETAILS OF CIRCUIT DIAGRAM, WORKING , REQUIREMENTS , APPLICATIONS
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please help me with the project report on the sensitive clap switch using op amp. i have already built the circuit and it works well. ....etc

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to get information about the topic light sensitive alarm with timer 555 full report ppt and related topic refer the page link bellow

http://seminarsprojects.net/Thread-light-sensitive-alarm ....etc

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