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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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tively use a translucent enclosure.
Once all components have been fitted and all solder connections have been inspected the PCB can be fitted into an insulated enclosure. The mains input lead will require some form of strain relief. Be aware that some tracks carry lethal voltages. All appropriate safety guidelines must therefore be adhered to. A small hole can be made in the lid directly over preset P1 if it is necessary to adjust the sensitivity of the circuitwithout dismantling the unit. Lastly, donâ„¢t forget to add perforations in the case so that sound waves can reach the microphone ..................[:=> 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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e from outside source then first transistor is cutoff and 2nd transistor conducts. Thus output of transistor is either logic-0 or logic-1 and it remains in one state 0 or 1 until it gets trigger pulse from outer source.
The pulse of clap which is trigger for 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 ..................[:=> 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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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 on bread boar..................[:=> 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:

Protect your mobile phone from unauthorized use or theft using this simple circu..................[:=> 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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c principles involved in utilizing acou..................[:=> 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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Clap switch PCB
The PCB layout shown in Figure 2 accommodates all components apart from the electret microphone. This is attached to the board at the MIC +/“ connections with a length of shielded audio lead (keep the wire length to less than around 10 cm).
Mounting the components onto the PCB should be quite straightforward. Start by fitting the single wire bridge next to rectifier B1. Ensure that all polarised components (diodes, LEDs, capacitors and the IC) are fitted the correct way round. The LED leads should be trimmed so that when it is soldered to the board it protrudes through..................[:=> 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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g the Ëœonâ„¢ and the other for indicating the Ëœoffâ„¢ state. A second clap, while the appropriate LED is lit, activates that function. For example, if you clap while LED10 used in conjunction with Lamp 1 is lit then the lamp turns on. (If it is already on, nothing happens and it remains on.) A condenser microphone, as used in tape recorders, is used here to pick up the sound of the claps. The signal is then amplified and shaped into a pulse by three inverters (N1 through N3) contained in CMOS hex inverter IC CD4069. A clock generator built from two of the inverter gates (N5 and N..................[:=> Show Contents <=:]



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