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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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HI'
I VINODMALA..................[:=> Show Contents <=:]



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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the voltage across it.Now the transistor will switch to ON.This gives power to the IC1 and 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,BC..................[:=> Show Contents <=:]



PIR BASED AUTO DIALER SECURITY and SAFETY ALARM


Posted by: seminar presentation
Created at: Friday 28th of May 2010 09:21:58 AM
Last Edited Or Replied at :Wednesday 21st of November 2012 12:11:59 AM
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sor. Obviously, this burglar alarm also has an input to 'arm' the alarm, a tamper input and a couple of outputs to control a siren and Auto dialing system.
Often times, crime happens when no one is around to notice and the crooks are long gone by the time anyone gets back. Now, you can protect your home or office with the AUTO DIALER SECURITY and SAFETY ALARM. This auto dialer is a step
The Auto Dialer is a unique passive infrared system that monitors motion in an area you select. When the unit is ARMED, the motion detector watches the protected area. Once movement is detected, a 105db sec..................[:=> 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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ogic level present at the ?D? input is transferred to the output during the positive-going transition of the clock pulse. Setting or resett..................[:=> Show Contents <=:]



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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any informa..................[:=> Show Contents <=:]



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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nics.co.uk/electronicsclubkits.htm..................[:=> 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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lume of the sound from the speaker. The circuit can be powered from a9V battery or from mains by using a 9Vpower adaptor. Assemble the circuit on a general purpose PCB and en..................[:=> 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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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.pdf.html..................[:=> Show Contents <=:]



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