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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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e. There are two types of such converters – the weighted resistor DAC and the R–2R ladder DAC.
The R–2R ladder (binary ladder) is a resistive network whose output voltage is a properly weighted 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 fo..................[:=> 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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nd compare them with theoretical results.

Brief theory – as shown in the above circuit, simple clock generator can be constructed using Schmitt trigger NOT gates. A LOW value of R1 is used across first inverter to bias it near its linear region and therefore, must remain fixed. Capacitor C1 provides the necessary feedback for oscillations. It is the main component that determines the frequency of the clock and can be changed for adjusting the frequency. The diode in the circuit is used to rectify the AC signal, since negative voltages applied to the inputs of TTL ..................[:=> Show Contents <=:]

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
power kicker heat pipe , diode based thyristor based, heat pipe cooling , cooling natural convection, finns used in natural convection seminar , cooling by convection,
ling scheme, however,
often caused problems of installation space because the
heat-radiating fins had to be very long because of their
poor heat radiating efficiency.
In an effort to solve this problem, Furukawa Electric has
developed the 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 bec..................[:=> 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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output signal of operational amplifier which is nothing but the input audio signal. We are using push pull amplifier because the output impedance of push pull amplifier is match able with the low voltage speaker. We get the amplified signal at the output of push pull amplifier then this amplified electrical signal is converted back into the audio signal. This is the basic introduction of simple audio amplifier.
The variable resistance is used to control the gain of operational amplifier. Gain of the circuit is depends upon the feedback of the circuit.
BLOCK DIAGRAM ..................[:=> 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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Smart Hearing Aid
368. Flashing-Cum-Running Light
369. Prepaid Energy Meter
370. Mosfet-Based Preamplifier for FM Radio DXing
371. Friendly Charger for Mobile Phones
372. Microcontroller Based Digital Code Lock System
373. Infrared Firecracker Igniter
374. TRIAC Based SPEED Control Of Induction Motor
375. RFID based Access Contrpl System
376. IR Burglar Deterrent
377. RF based (wireless) temperature monitoring.
378. Electronic Voting M/C
379. Frame separation and restoration of video signal
380. Point of Sale (POS) Terminal with Wireless Data Logging TO PC
381. Constant-..................[:=> 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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recognition that every building is equipped with an RF waveguide distribution system—the HVAC ducts. The use of the HVAC ducts i..................[:=> 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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n 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 normal conversation.
The circuit uses IC KT3170 (DTMF-to-BCD converter), 74154 (4-to-16-line demult-iplexer), and five CD4013 (D flip-flop) ICs. The working of the circuit is as follows.
Once a call is established (after hearing ring-back tone), ..................[:=> Show Contents <=:]

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