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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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indication of the negative lead.
10µF capacitors: a collection
Here they are, all shapes and sizes, all of them of capacity ten microfarads, but of different voltage ratings
The Capacitors: 1000µF
Here, you can see the arrow pointing to the negative lead. All aluminium electrolytic capacitors indicate the negative lead in this way. These have to be connected up the right way around in a circuit, or else grief would ensue.
The Microphone
If you look closely, one terminal is connected to the body. This is the ground terminal, connected to negative. The other terminal is co..................[:=> 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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flip-flop makes changes to the output which is complementary (reverse). Decision of flip-flop which is in the low current form is unable to drive relay directly so we have used a current amplifier circuit by using Q4 which is a common emitter circuit. Output of Q4 is connected to a Relay (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 ..................[:=> 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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oblem for makin report & how i would make on pcb 2 get neat &clean diagram. i hv ckt diagram also& i hv done on bread board. in the ckt 3 transistor,2 led &capacitor, resistor used.when i go for pcb it look sm complicate. so can u plz help me 2 get simple diagram on pcb.

thnks ..................[:=> 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..................[:=> 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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ind 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 considerations the illiterates that may have problems operating some “complex” hand-held Remote Control Units (RCUs) Therefore this paper provides an introductory study on the basic principles involved in utilizing acoustic energy to control switching process. This is achieved by converting the energy generated by the “handclap” into electrical pulse, which is in turn used to drive an electronic circuitry..................[:=> 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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e best way of identifying these is to use a meter and measure them. That is what I do, because most of my components are pulled off old circuit boards and they might just be pretending to be healthy. Age and ill treatment will have faded the colours so that only the meter can distinguish between, for example, a 2.2K resistor (red-red-red) and a 33K one (orange-orange-orange).
The Diodes
The 1N4148 diodes are extremely small, glass, and most likely have just the polarity marking. The current flow is towards the band. That is, when the banded end is made negative, current flows. And, in sharp ..................[:=> 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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operation, once you are sure everything else is working satisfactorily. CMOS ICs are used in this circuit for implementing the amplifying and logic functions. Use of a dedicated supply is recommended because the integrated circuits will be damaged if the supply voltage is too high, or is of wrong polarity. An external power supply may get connected up the wrong way around, or be inadvertently set to too high a voltage. Therefore it is a good idea to start by constructing the power supply section and then add the other components of the circuit. If the clock is working, you may turn your atten..................[:=> Show Contents <=:]



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