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Sound operated switch using a simple transistor circuit


Posted by: project topics
Created at: Friday 23rd of April 2010 01:06:59 PM
Last Edited Or Replied at :Friday 23rd of April 2010 01:06:59 PM
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irection while a pulse to the other coil will cause the relay to switch back. This type of relay has two main advantages: the relay is latching in both open and close direction so a short pulse is all that is necessary to switch it. Secondly the latching feature ensures that the relay retains its switched state even during a power failure. Changeover relay contacts enable the unit to be wired together with a changeover type manual switch, allowing the equipment to be switched manually if for any reason the clap switch is switched off.
Pins 2 and 7 are used to switch a twocolour LED providing ..................[:=> Show Contents <=:]



Antisleep alarm for students presentation and pcb design


Posted by: M Junaid
Created at: Thursday 05th of May 2011 08:17:34 PM
Last Edited Or Replied at :Friday 06th of May 2011 12:45:10 AM
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CLAP SWITCH THEORY


Posted by: seminar class
Created at: Tuesday 29th of March 2011 01:51:20 AM
Last Edited Or Replied at :Saturday 20th of October 2012 01:35:25 AM
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CLAP SWITCH , we find that the clap switch system is most important and useful tp us .It is used to turn ON or OFF any electrical circuit by a simple clap eliminating the need to turn the switch ON or OFF manually.

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CLAP SWITCH PROJECT REPORT PCB CKT DIAGRAM USING TRNSISTOR LED ONLY


Posted by: prashant kishore
Created at: Saturday 30th of October 2010 02:13:29 AM
Last Edited Or Replied at :Wednesday 28th of November 2012 01:19:54 AM
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HELLO,
this is prashant,btech ece(2nd year). I hv 2 submit a project& the p..................[:=> Show Contents <=:]



MOBILE SHIELD


Posted by: project report helper
Created at: Wednesday 13th of October 2010 02:34:07 AM
Last Edited Or Replied at :Monday 04th of February 2013 02:58:13 AM
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MOBILE SH..................[:=> Show Contents <=:]



Design of a Clap Activated Switch


Posted by: seminar surveyer
Created at: Thursday 07th of October 2010 11:34:38 PM
Last Edited Or Replied at :Wednesday 09th of March 2011 11:55:59 PM
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ppliance connected through it to the main. The device is activated by clapping twice within a set time period that is determined by a time constant (RC) component value in the circuit.


for more details, please visit
http://ljs.academicdirect.org/A13/044_058.pdf..................[:=> Show Contents <=:]



Sound operated switch using a simple transistor circuit


Posted by: project topics
Created at: Friday 23rd of April 2010 01:06:59 PM
Last Edited Or Replied at :Friday 23rd of April 2010 01:06:59 PM
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ed capacitor, of 0.1 microfarads (100 nanofarads). This is connected through steering diodes to the base of the transistor which is conducting. This transistor stops conducting, and the other transistor was not conducting anyway. So at a clap, both transistors become off.
Then, those two capacitors across the base resistors come into action. The capacitor connecting to the base of the transistor which was ON has voltage across it. The capacitor connecting to the base of the transistor which was OFF has no voltage across it.
As the sound of the clap dies away, both bases rise towards the su..................[:=> Show Contents <=:]



Clap Activated Remote


Posted by: Electrical Fan
Created at: Saturday 10th of October 2009 04:59:48 AM
Last Edited Or Replied at :Saturday 10th of October 2009 04:59:48 AM
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N1 inverter in this IC, which is configured as an amplifier. The output of gate N1 is directly connected to the input of next gate N2. Capacitor C3 couples the output of this inverter to N3 inverter, which is connected as an adjustable level comparator. Inverter N4 is connected as an LED (9) driver to help in setting the sensitivity. Preset VR1 supplies a variable bias to U3. If the wiper of VR1 is set towards the negative supply end, the circuit becomes relatively insensitive (i.e. requires a thunderous clap to operate). As the wiper is turned towards resistor R4, the circuit becomes progress..................[:=> Show Contents <=:]



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