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heat sensor with fan cooling using ic 741 pdf

Posted by:
Created at: Friday 16th of November 2012 01:22:43 AM
Last Edited Or Replied at :Friday 16th of November 2012 01:22:43 AM
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Study the working of 4bit R2R ladder DA converter circuit

Posted by: seminar class
Created at: Friday 13th of May 2011 11:10:18 PM
Last Edited Or Replied at :Friday 13th of May 2011 11:10:18 PM
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ighted sum of the digital inputs. It uses resistors of only two values, the R and the 2R, as shown in the above figure.
It has four digital inputs D, C, B and A with positional values of bits as 23, 22, 21 and 20 respectively. The equivalent analog voltage is (Va) which is obtained at the input of operational amplifier IC 741. If the digital input is DCBA = 1000, then the circuit can be reduced as follows –

Conclusion –
1) The circuit can convert applied digital input combinations into their equivalent analog output voltages.
2) The operational amplifier is ..................[:=> Show Contents <=:]

Study the working of Schmitt trigger inverter as square wave generator

Posted by: seminar class
Created at: Friday 13th of May 2011 10:58:03 PM
Last Edited Or Replied at :Tuesday 02nd of October 2012 02:41:37 AM
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ltage (–Vsat) of +0.9V, the output goes HIGH. Following figure shows how the output swings HIGH and LOW with the input threshold voltages and constitutes a Hysteresis loop of curve –

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Vertical Cooling Device Using Heat-Pipe Based on Natural Convection PowerKicker

Posted by: seminar class
Created at: Tuesday 03rd of May 2011 01:09:37 AM
Last Edited Or Replied at :Tuesday 03rd of May 2011 01:09:37 AM
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PowerKicker that enables footprint reduction
regardless of being a natural convection type, and put
it into practical application. See Photo 1.
Conventional boiling cooling system as shown in Figure 1
creates problems about global environment preservation
such as ozone depletion and global warming because its
structure is such that heat-generating components are
directly immersed in an electrical-insulating cooling medium
such as CFCs or CFC substitutes consuming a large
amount of such a cooling medium.
On the other hand, horizontal co..................[:=> Show Contents <=:]


Posted by: seminar class
Created at: Friday 22nd of April 2011 06:20:00 AM
Last Edited Or Replied at :Friday 22nd of April 2011 06:20:00 AM
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plifier. This zero reference voltage is connected to IC 741 at pin 3 (non inverting input). The resistance R4 and R5 are used for biasing purpose. Positive 5 volts supply is connected to pin 7 & pin no 4 is connected to ground terminal of IC 741. Operational amplifier amplifies signal and give output at pin 6.
Operational amplifier has a feedback from pin 6 to pin 2 which inverting input through a variable resistance R1 (100kΩ) which control the gain of operational amplifier. Resistance R6 is used if variable resistance is zero then IC can be damaged due to amplified signal so a small resist..................[:=> Show Contents <=:]

main project topics for electronics and communication

Posted by: project topics
Created at: Wednesday 29th of December 2010 05:46:28 AM
Last Edited Or Replied at :Sunday 27th of March 2011 03:37:24 AM
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ode Control
297. Versatile Power Supply
298. Telephone Call Counter
299. Invisible Broken Wire Detector
300. Programmable Timer for Appliances
301. Stepper Motor Controller using uC with LCD
302. 4 Channel Fault Enunciator
303. Electronic Guide for Blind
304. Automatc Toll Collection using RFID with Wireless Gate Receiver
305. Automatic Beverage Vending M/C
306. MAT Switch
307. Digital Dice with numeric display
308. Rank Display system w/o Race
309. Hybrid Power system
310. Battery-level Indicator
311. Poor Man’s Hearing Aid
312. Miniature strobe light
313. PC-ba..................[:=> Show Contents <=:]

Wireless RF Distribution in Buildings using Heating and Ventilation Ducts

Posted by: projects wizhard
Created at: Thursday 29th of July 2010 08:27:45 AM
Last Edited Or Replied at :Thursday 29th of July 2010 08:27:45 AM
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angular duct over the 902-928 MHz ISM band.

One of the challenges related to the installation of wireless networks in buildings is the need to predict RF propagation and coverage in the presence of complex combinations of shapes and materials in a building environment. In general, the attenuation in buildings is higher than in free space, requiring more cells and higher power to obtain adequate coverage. Over the past several years, an extensive wireless data network has been installed at Carnegie Mellon that provides coverage to about one half of the campus with raw..................[:=> Show Contents <=:]

Remote control using telephone

Posted by: computer science crazy
Created at: Wednesday 09th of September 2009 02:02:38 AM
Last Edited Or Replied at :Wednesday 09th of September 2009 02:24:07 AM
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„¢ of appliances through telephone lines. It can be used to switch appliances from any distance, overcoming the limited range of infrared and radio remote controls.
The circuit described here can be used to switch up to nine appliances (corresponding to the digits 1 through 9 of the telephone key-pad). The DTMF signals on telephone instrument are used as control signals. The digit ˜0™ in DTMF mode is used to toggle between the appliance mode and normal telephone operation mode. Thus the telephone can be used to switch on or switch off the appliances also while being used for norm..................[:=> Show Contents <=:]

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