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fire alarm using ldr pdf


Posted by:
Created at: Sunday 23rd of December 2012 10:01:48 AM
Last Edited Or Replied at :Monday 24th of December 2012 12:12:21 AM
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I VINODMALAV FROM AI..................[:=> Show Contents <=:]



fire alarm circuit doc


Posted by:
Created at: Tuesday 20th of November 2012 06:02:44 AM
Last Edited Or Replied at :Wednesday 21st of November 2012 01:36:29 AM
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Simple Fire Alarm Circuit


Posted by: smart paper boy
Created at: Saturday 18th of June 2011 06:23:09 AM
Last Edited Or Replied at :Saturday 18th of June 2011 06:23:09 AM
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d it outputs 5V.This powers the tone generator IC UM66 (IC2) to play a music.This music will be amplified by IC3 (TDA 2002) to drive the speaker.
The diode D1 and D2 in combination drops 1.4 V to give the rated voltage (3.5V ) to UM66 .UM 66 cannot withstand more than 4V.
Notes:
• The speaker can be a 8Ω tweeter.
• POT R4 can be used to adjust the sensitivity of the alarm.
• POT R3 can be used for varying the volume of the alarm.
• Any general purpose NPN transistor(like BC548,BC148,2N222) can be used for Q1.
• The circuit can be powered from a 9V battery or a 9V ..................[:=> Show Contents <=:]



Simple Sound Activated Burglar Alarm System


Posted by: Sidewinder
Created at: Saturday 15th of May 2010 10:47:40 PM
Last Edited Or Replied at :Tuesday 12th of October 2010 04:39:07 AM
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8051 based lamp with alarm


Posted by: ajithindu
Created at: Thursday 01st of April 2010 09:01:52 PM
Last Edited Or Replied at :Thursday 01st of April 2010 09:01:52 PM
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Light sensitive Alarm


Posted by: seminar topics
Created at: Tuesday 30th of March 2010 09:02:39 AM
Last Edited Or Replied at :Wednesday 06th of October 2010 01:44:11 AM
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ll then cause the bleeper to sound. The light sensor is an LDR (light-dependant resistor), this has a low resistance in bright light and a high resistance in dim light.

The light-sensitivity of the circuit can be adjusted by varying the 100k preset.
The length of bleep can be varied from 0.5 to 10 seconds using the 1M preset.
Using the 7555 low-power timer ensures that the circuit draws very little current (about 0.5mA) except for the short times when the bleeper is sounding (this uses about 7mA). If the circuit is switched on continuously an alkaline PP3 9V battery should last about a mo..................[:=> Show Contents <=:]



liquid level Alarm


Posted by: electronics seminars
Created at: Saturday 09th of January 2010 06:31:42 AM
Last Edited Or Replied at :Saturday 09th of January 2010 06:31:42 AM
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s generated when the liquid tank is full. Initially, when the tank is empty, transistor T1 does not conduct. Consequently, transistor T2 conducts and pin 4 of IC1 is low. This low voltage disables IC1 and it does not oscillate. The low output of IC1 disables IC2and it does not oscillate. As a result, no sound is heard from the speaker. But when the tank gets filled up, transistor T1 conducts. Consequently, transistor T2 is cut off and pin 4 ofIC1 becomes high. This high voltage enables IC1 and it oscillates to produce low frequencies at pin 3. This low-frequency output enables IC2 and it also ..................[:=> Show Contents <=:]



Automated alarm CirCuits


Posted by: mechanical wiki
Created at: Tuesday 08th of September 2009 05:34:49 AM
Last Edited Or Replied at :Saturday 17th of November 2012 12:45:33 AM
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control unit. Fig. 2 shows the circuit of only the British police siren tone generator, which has
to be integrated with the control circuit portion of Fig. 1 at points A and B to complete the circuit diagram of automated alarm

http://www.ziddu.com/download/5196571/AUTOMATEDALARMCIRCUITS_1.pd..................[:=> Show Contents <=:]



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