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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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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 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 transis..................[:=> 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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The sound of clap is received by a small m..................[:=> 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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ashant,btech ece(2nd year). I hv 2 submit a project& the project name is clap switch. i have a problem for makin report & how i would make on pcb 2 get neat &clean diagram. i hv ckt diagram also& i hv done..................[:=> 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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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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Introduction

The primary purpose of switch is to provide means for connecting two or more terminals in order to permit the flow of current across them, so as to allow for interaction between electrical components, and to easily isolate circuits so as to terminate this Design of a Clap Activated Switch S.OLOKEDE, Seyi STEPHEN45 communication flow when need be. The motivating force behind this design is based on the desire to alleviate the problem faced by the aged and physically challenged persons in trying to control some household appliances. It also takes into considerat..................[:=> 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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brings down the gain. The value of 5600 ohms (usually abbreviated to 5.6K, and written down in schematics as 5K6) seems to work all right.
Amplifier
A transistor stage, biased near cut-off (that is, almost no current with no signal) amplifies the signal from the microphone. The output of the microphone is coupled to the base of the transistor using an electrolytic capacitor (note: using a better capacitor here will not work). The top of the electret microphone is at a few volts, the base conducts at around half a volt, so the leakage current of the capacitor (all electrolytic capacitors lea..................[:=> 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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ith two claps of your hand. These switches may be used to control lights or fans “ or anything else that does not produce too loud a sound. To prevent an occasional loud sound from causing malfunction, the circuit is normally quiescent. The first clap takes it out of standby state and starts a scan of eight panel-mounted LEDs. Each of the four switches are accompanied with two LEDs “ one for indicating the ˜on™ and the other for indicating the ˜off™ state. A second clap, while the appropriate LED is lit, activates that function. For example, if you clap while LED1..................[:=> Show Contents <=:]



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