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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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this connection, due to the base current through it, one red LED in the bistable switches between half bright and full, and the other switches between fully off and on. This is normal.
Because the LEDs do not draw as much current as a filament lamp, the output transistor, too, can be of the common small signal variety. All four could be any small signal n-p-n transistor and the circuit should work. So would it with four p-n-p transistors, provided you switch the polarity of every (polarised) component.
Bill of Materials
The Resistors
From top to bottom, these are:
33 K - orange, orange, o..................[:=> 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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Electromagnetic switch), works like a mechanical switch. With the help of a relay it is easy for connecting other electrical appliance.
The relay contact is connected to the power line and hence turns on/off any electrical appliance connected all the way through relay.
INTRODUCTION
Here is a circuit for electronic hobbyists that can switch ON and OFF a light , a fan or a Radio etc…
The sound of clap is received by a small microphone that is shown biased by resistor R1 in the circuit. The signal is further amplified by transistor Q1 ,Q2 ,Q3 . The relay contact is connect..................[:=> Show Contents <=:]



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 project name is cl..................[:=> 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 SHIELD circuits

 D. MOHAN KUMAR


MOBILE SHIELD MALAYAPPASAMY
Abstract:..................[:=> 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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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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e base of the other transistor. Since this resistor sees voltage, it supplies the base with current, ensuring that the transistor remains on. Thus this state is stable. By symmetry, the other state is, too.
Changing state
On a clap, the state of the bistable changes. The output of the amplifier is converted to a sharp pulse by passing it through a (relatively) low valued 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 any..................[:=> 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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clap-to-start feature is not required, it may be disabled by omitting components D1, D2, R5, C4 and connecting a wire link in place of diode D2. Then IC2 will be alive and kicking all the time.


courtesy http://www.electronic-circuits-diagrams.com..................[:=> Show Contents <=:]



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